Ciencia Tecnologia y Futuro最新文献

{"title":"ETHYL ACETATE OXIDATION OVER MnOx-CoOx. RELATIONSHIP BETWEEN OXYGEN AND CATALYTIC ACTIVITY","authors":"María-Haidy Castaño-Robayo, Rafael Molina-Gallego, Sonia Moreno-Guáqueta","doi":"10.29047/01225383.19","DOIUrl":"https://doi.org/10.29047/01225383.19","url":null,"abstract":"La oxidacion catalitica es una alternativa promisoria para la transformacion de contaminantes atmosfericos como los compuestos organicos volatiles. Los catalizadores basados en oxidos de Mn y Co se encuentran dentro de los mas activos en las reacciones de oxidacion debido a sus propiedades redox y su movilidad de oxigeno. La co-precipitacion es uno de los metodos mas empleados para preparar oxidos metalicos por las propiedades unicas que presentan los solidos finales. En tal sentido y con el fin de comprender la relacion existente entre las especies de oxigeno y la actividad de los catalizadores, en este trabajo se prepararon oxidos mixtos de Mn-Co-Mg-Al mediante la metodologia de coprecipitacion. Los catalizadores se caracterizaron por difraccion de rayos X, area superficial, desorcion de oxigeno a temperatura programada, capacidad de almacenamiento de oxigeno e intercambio isotopico 18O/16O; adicionalmente, se evaluo la actividad catalitica en la oxidacion del acetato de etilo. Los resultados indican que los oxidos que contienen manganeso presentan especies de oxigeno adsorbidas superficialmente y una mayor cantidad de oxigenos susceptibles de sufrir ciclos redox mientras que los oxidos que contienen cobalto demuestran la presencia de oxigenos con mejor movilidad. En la oxidacion del acetato de etilo, los oxigenos mas disponibles de conducir ciclos redox y los oxigenos adsorbidos en la superficie resultan ser el factor determinante.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80700332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"OPERATING CONDITIONS INFLUENCE ON VMD AND SGMD FOR ETHANOL RECOVERY FROM AQUEOUS SOLUTIONS","authors":"R. D. L. Espriella, Fredy-Wsbaldo Barón-Núñez, Carlos-Jesús Muvdi-Nova","doi":"10.29047/01225383.21","DOIUrl":"https://doi.org/10.29047/01225383.21","url":null,"abstract":"espanolEste trabajo se enfoca en la Destilacion con Membranas con Vacio (VMD, por sus siglas en ingles) y con Gas de Arrastre (SGMD, por sus siglas en ingles) como tecnica para separar el etanol de soluciones acuosas. La VMD fue estudiada utilizando condiciones moderadas de temperatura (30, 40 y 50°C) y presion (0.11, 0.20 y 0.30 atm), mientras que la SGMD fue estudiada a temperaturas de 50 y 70°C y flujos de aire de 10x10-6 y 20x10-6 m³·min-1. Las tecnicas fueron estudiadas experimentalmente usando soluciones etanol:agua preparadas y caldos de fermentacion, ajustando la concentracion de etanol al 10% p/p. Bajo estas condiciones de operacion y utilizando soluciones etanol:agua preparadas, se obtuvieron flux totales promedio de 22.61 y 1.6 kg·m-2·h-1, y factores de concentracion de 2.3 y 1.7 para VMD y SGMD, respectivamente. Para el caso de los caldos de fermentacion, se obtuvieron flux totales promedio de 17.66 y 0.9 kg·m-2·h-1, y factores de concentracion de 1.8 y 1.9 para VMD y SGMD, respectivamente. El impacto del ensuciamiento tambien fue estudiado, encontrando un efecto significativo de la presion (de vacio) para la tecnica VMD; principalmente debida a la presencia de biomasa en la solucion. Pruebas experimentales muestran que aplicando ciclos de presurizacion/despresurizacion se disminuye el ensuciamiento de la membrana, estabilizando el flujo y la concentracion en el permeado. Mientras para la configuracion SGMD, el impacto del ensuciamiento fue considerablemente menor. EnglishThis work focuses on Vacuum Membrane Distillation (VMD) and Sweeping Gas Membrane Distillation (SGMD) as a separating technique of ethanol from aqueous solutions. VMD was studied at moderate temperature (30, 40 and 50°C) and pressure (0.11, 0.20 and 0.30 atm) conditions, whereas SGMD was studied at different temperatures (50 and 70°C) and air-flow rates (10x10-6 and 20x10-6 m³·min-1). These techniques were experimentally studied using prepared ethanol-water solutions and fermented broths, with ethanol at 10% w/w. Under these operating conditions and using prepared ethanol-water solutions, an average total flux of 22.61 and 1.6 kg·m-2·h-1, and concentration factors of 2.3 and 1.7 were obtained for VMD and SGMD, respectively. For fermented broths, total flux of 17.66 and 0.9 kg·m-2·h-1, and concentration factors of 1.8 and 1.9 were obtained for VMD and SGMD, respectively. The fouling impact was also studied, finding a significant effect of pressure (vacuum) for VMD technique; mainly due to the biomass presence in the solution. Experimental results show that applying pressurization/depressurization cycles decreases membrane fouling, stabilizing flux and concentration in the permeate. While for SGMD configuration, the incidence of fouling was significantly lower. portuguesEste trabalho esta focado na Destilacao com Membranas em Vacuo (VMD em ingles) e com Gas de Arrastre (SGMD, em ingles) como tecnica para a separacao do etanol de solucoes aquosas. A VMD foi estudada uti","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87855360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THERMOPHYSICAL PROPERTIES OF CASTOR OIL (RICINUS COMMUNIS L.) BIODIESEL AND ITS BLENDS","authors":"Osman Gökdoğan, T. Eryilmaz, M. Yeşilyurt","doi":"10.29047/01225383.29","DOIUrl":"https://doi.org/10.29047/01225383.29","url":null,"abstract":"espanolEn este estudio, se produjo biodiesel (metil eter) a partir de aceite de ricino (Ricinus communis L.) (CO, de sus siglas en ingles) utilizando hidroxido de sodio (NaOH) y metanol (CH3OH) a traves del metodo de transesterificacion en dos pasos. Se prepararon nueve mezclas diferentes (2, 5, 10, 20, 30, 40, 50, 60 and 75% dependiendo del volumen de la mezcla con biodiesel. Se estimaron los valores de densidad del Biodiesel de Aceite de Ricino (COB, de sus siglas en ingles) y sus mezclas en un rango de temperatura de 0 a 93°C en intervalos de 5°C y tambien se estimaron los valores de viscosidad cinematica de COB y sus mezclas dentro del rango temperatura comprendido entre 30 y 100°C en intervalos de 5°C. Los resultados mostraron que la densidad, la viscosidad cinematica, el valor calorifico, el punto de ignicion, pH, la corrosion de la franja de cobre y el contenido de agua del COB son 932.40 kg·m-3, 15.069 mm².s-1, 38.600 MJ·kg-1, 182°C, 7, 1a y 1067.7 mg.kg-1, respectivamente. La densidad y la viscosidad cinematica de las muestras de combustible disminuyen a medida que aumenta la temperatura; y tambien estas propiedades disminuyen como resultado del aumento en la cantidad de biodiesel en las mezclas. EnglishIn this study, biodiesel (methyl ester) was produced from Castor Oil (Ricinus communis L.) (CO) using sodium hydroxide (NaOH) and methanol (CH3OH) by the two-step transesterification method. Nine different fuel blends (2, 5, 10, 20, 30, 40, 50, 60 and 75% by volume blending with diesel) were prepared. The density values of Castor Oil Biodiesel (COB) and its blends were measured at the temperature range from 0 to 93°C in steps of 5°C and the kinematic viscosity values of COB and its blends were measured at the temperature range from 30 to 100°C in the steps of 5°C. The results showed that the density, kinematic viscosity, calorific value, flash point, pH, copper strip corrosion and water content of COB are 932.40 kg·m-3, 15.069 mm².s-1, 38.600 MJ·kg-1, 182°C, 7, 1a and 1067.7 mg.kg-1, respectively. The density and kinematic viscosity of fuel samples decrease as temperature increases; and also these properties decrease as a result of the increase in the amount of diesel in the blends. portuguesNeste estudo, o biodiesel (metil eter) foi produzido a partir do oleo de ricino (Ricinus communis L.) (CO, por suas siglas em ingles) usando hidroxido de sodio (NaOH) e metanol (CH3OH) atraves de um metodo de transesterificacao de dois passos. Foram preparadas ate nove misturas de combustivel diferentes (2, 5, 10, 20, 30, 40, 50, 60 e 75% por volume de mistura com o diesel). Os valores de densidade do biodiesel de oleo de ricino (COB, por suas siglas em ingles) e as suas misturas foram calculados dentro do rango de temperatura de 0 a 93°C no passo de 5°C e os valores de viscosidade cinematica do COB e das misturas foram calculadas no rango de temperatura de 30 a 100°C no passo de 5°C. Os resultados demonstraron que a densidade, viscosidade cinematica,","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81252465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of mixing parameters for polymer gels used for the correction of water injection profiles","authors":"G. Toro, Rubén Hernán Castro García, R. Díaz, S. F. M. Navarro","doi":"10.29047/01225383.26","DOIUrl":"https://doi.org/10.29047/01225383.26","url":null,"abstract":"espanolLos geles polimericos como modificadores del perfil de inyeccion en procesos de recobro secundario son una tecnica ampliamente utilizada en la industria, sin embargo, su uso se fundamenta en el exito de sus aplicaciones, sin existir un conocimiento detallado de los mecanismos del fenomeno, y dejando abiertas grandes dudas sobre factores de diseno, variables de riesgo, prediccion de los resultados a obtener, etc. El diseno de las aplicaciones en campo es realizado siguiendo los conceptos formulados desde la creacion de la tecnologia, involucrando solamente pruebas fluido-fluido, con enfoque cualitativo que no permite analizar en detalle los fenomenos presentes. Esta investigacion parte de las pruebas fluido-fluido comunmente usadas en esta tecnologia para posteriormente involucrar analisis cuantitativos como rayos ultravioleta y pruebas reologicas, obteniendo resultados que permiten entender mejor el proceso bajo estudio. Se obtiene de la investigacion realizada nuevas formas de evaluar los parametros de mezcla necesarios previa a la aplicacion en campo de geles para taponamiento de zonas ladronas de agua. EnglishPolymer gels as modifiers of the injection profile in secondary recovery processes are a widely used technic in the industry, however, its use is based on the success of their applications, without existing a detailed knowledge of the mechanisms of the phenomenon, leaving open big doubts on design factors, risk variables, prediction of results to be obtained, etc. Design of applications in the field is performed following the concepts formulated since the creation of the technology, involving only fluid-fluid tests, with a qualitative approach that does not allow a detailed analysis of the phenomena. Fluid-fluid tests, commonly used in this technology, are the starting point of this research to further involve quantitative analysis such as ultraviolet rays and rheological tests for better understanding of the process. From this research were obtained new ways to assess mixing parameters needed prior to field application of gels for plugging of water thief zones. portuguesO gel de polimero como modificador do perfil de injecao em processos de recuperacao secundaria e uma tecnica amplamente utilizada na industria, no entanto, seu uso esta baseado no sucesso de suas aplicacoes, sem que ainda exista um conhecimento detalhado sobre os mecanismos do fenomeno, deixando abertas grandes duvidas sobre fatores de desenho, variaveis de risco, predicao de resultados a ser obtidos, etc. O desenho de aplicacoes no campo se faz segundo os conceitos formulados desde a criacao da tecnologia, envolvendo apenas testes fluido-fluido, com uma abordagem qualitativa que nao possibilita uma analise detalhada do fenomeno. Os testes fluido-fluido, comumente utilizados nesta tecnologia, sao os pontos de partida da pesquisa para integrar ainda mais a analise qualitativa como raios ultravioletas e testes reologicos para uma melhor compreensao do processo. Com b","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77228334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New approach for compaction prediction in oil reservoirs","authors":"Javier Fernando Mendoza Molina, C. Montes, Z. Carrillo","doi":"10.29047/01225383.23","DOIUrl":"https://doi.org/10.29047/01225383.23","url":null,"abstract":"espanolA medida que los fluidos son producidos del yacimiento, se reduce la presion de poro, disminuyendose la capacidad de la roca que se compacta para soportar la presion de sobrecarga, incrementandose de esta forma el esfuerzo efectivo que podria alcanzar el colapso de los poros. El yacimiento puede compactarse bajo una deformacion elastica hasta que la presion de poros caiga alcanzando el limite elastico, a partir del cual se inicia la deformacion plastica que es conocida como la compactacion mecanica. El objetivo de este trabajo es proponer modelos que permitan representar y predecir con aproximacion la magnitud de la compactacion en el pozo que puede desarrollarse en un yacimiento durante la produccion de aceite (se podria usar otro modelo que amplie el rango de alcance hasta los limites del yacimiento), integrando un modelo matematico de compactacion uniaxial con la ecuacion de caida de presion en la cara de la formacion, luego la construccion de un modelo numerico que reproduce el fenomeno de compactacion y sus cambios en el tiempo. El modelo matematico se construye a partir del modelo de compactacion uniaxial y la ecuacion de la caida de presion, no es un modelo complejo pero integra las variables principales involucradas en el fenomeno de compactacion, como la compresibilidad de la roca, el modulo elastico, la porosidad, permeabilidad y presion del fluido. En este articulo se presenta un nuevo modelo numerico a partir del fundamento del modelo de Geertsma (1973), incluyendo un procedimiento paso a paso para calcular las nuevas propiedades de la roca con el tiempo, con el fin de obtener la magnitud de la compactacion mas real. EnglishAs reservoir fluids are produced, pore pressure decreases and compacting rock loses capacity to support the overburden pressure, while the effective stress increases rapidly leading to pore collapse. Reservoir can elastically compact itself until pore pressure drops to the elastic limit, then initiates a plastic deformation known as mechanical compaction. Using numerical models is a good tool for compaction prediction; as they can predict reservoir behavior. This paper is purported by some models that allow providing for an approximate representation and prediction of the compaction magnitude at the wellbore developed in oil reservoirs during production (another model could be used to amplify the range until reservoir limits), integrating a uniaxial compaction mathematical model with pressure drawdown equation in formation face, and then a numerical model is built aimed reproducing the phenomenon and its changes over time. The mathematical model is built with the uniaxial compaction model and the drawdown pressure equation. The model is not complex but integrates the mean variables and rock properties involved in compaction phenomenon, like rock compressibility, elastic modulus, porosity, permeability and fluid pressure. This paper develops new numerical model based on the foundations of the Geertsma (1973) ","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81937671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of vacuum gas oils using ft-icr ms","authors":"Andrea Gómez Escudero, F. Ruíz, Jorge Armando Orrego Ruíz","doi":"10.29047/01225383.27","DOIUrl":"https://doi.org/10.29047/01225383.27","url":null,"abstract":"espanolLa composicion molecular de cinco gasoleos medios de vacio (MVGO's, de sus siglas en ingles) se estudio utilizando un espectrometro de masas de resonancia de ion ciclotron por transformada de Fourier de 15T (FT-ICR MS, de sus siglas en ingles), acoplado a Ionizacion por Electrospray (ESI, de sus siglas en ingles) y foto ionizacion a presion atmosferica (APPI, de sus siglas en ingles). La distribucion de clases y dobles enlaces equivalentes (DBE, de sus siglas en ingles) fueron comparadas; compuestos con nitrogeno basico y no basico y oxigeno fueron detectados a traves de ESI en modo negativo y positivo, mientras que hidrocarburos aromaticos y especies con atomos de azufre fueron obtenidos con APPI. La distribucion composicional revelo tendencias entre las clases y los tipos de heteroatomos presentes en los MVGO, ademas se evidencio una relacion entre la composicion quimica de los gasoleos (relacionados con aromaticidad, madurez y biodegradacion) y algunas de sus propiedades macroscopicas tales como la gravedad API. Adicionalmente, la abundancia relativa de las clases observadas correlaciono muy bien con el contenido de azufre y nitrogeno determinado para los gasoleos a traves de metodos convencionales. Estos avances preliminares se reportan por primera vez para gasoleos Colombianos en este trabajo, y proporcionan la idea de que es posible obtener informacion semi cuantitativa a traves de los experimentos de FT-ICR MS. EnglishThe molecular composition of five Medium Vacuum Gas Oils (MVGOs) was studied using 15T Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR MS) coupled with Electrospray Ionization (ESI) and atmospheric pressure photoionization (APPI). Class and Double Bond Equivalence (DBE) distribution of the MVGOs were compared; non-basic, basic nitrogen and oxygen compounds were detected using ESI negative and positive mode while aromatic hydrocarbons and sulfur species were visible via APPI. Compositional distributions revealed definitive heteroatom class and type trends among the MVGOs, and provide evidence of the relationship between chemical composition of gas oils (in terms of aromaticity, maturity and biodegradation) and some of its macroscopic properties such as API gravity. Furthermore, the observed class relative abundances matched well with the sulfur and nitrogen content determined for the MVGO's by conventional methodologies. These preliminary approaches are here reported for Colombian gas oils for the first time, and afford as insight that it is possible to obtain semi quantitative information from FT-ICR MS experiments. portuguesA composicao molecular de cinco gasoleos de vacuo medios (MVGO's por suas siglas em ingles) foi estudada utilizando um espectrometro de massas de ressonância de ion ciclotron por transformada de Fourier de 15T (FT-ICR MS, por suas siglas em ingles), unido a Ionizacao por Electrospray (ESI, por suas siglas em ingles) e foto ionizacao a pressao atmosferica (APPI, por suas siglas e","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78893985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unstructured kinetic model for batch fermentation of usp glycerol for lactic acid production","authors":"Jimy Alexander Gamboa Rueda, Víctor Alexis Lizcano González, M. Supelano, José Andrés Pérez Mendoza, Carolina Guzmán Luna, L. Giraldo","doi":"10.29047/01225383.28","DOIUrl":"https://doi.org/10.29047/01225383.28","url":null,"abstract":"espanolEn este trabajo se demostro la capacidad de Lactobacillus rhamnosus ATCC 7469 para producir acido lactico usando glicerol crudo proveniente de la industria del biodiesel como fuente de carbono, ademas se propuso y se desarrollo un modelo cinetico que describe el proceso de fermentacion usando glicerol USP como sustrato. La cepa fue adaptada a la nueva fuente de carbono utilizando cultivos sucesivos, la conversion de sustrato fue de hasta 94.5% despues de 24 horas de fermentacion en condiciones iniciales de sustrato de 8 g/L y pH inicial de 6.5 respectivamente. Posteriormente, la influencia del pH inicial (pHo) y la concentracion de sustrato inicial (So) fueron evaluadas mediante ensayos fermentativos de glicerol USP. El valor optimo de productividad volumetrica de acido lactico (Qv) alcanzado en este trabajo fue de 0.087 g·L-1·h-1 para un pH inicial de pHo = 6.5 y una concentracion inicial de sustrato So = 6 g/L. Finalmente los parametros cineticos de un modelo no estructurado y no segregado (ecuacion tipo Aiba para la velocidad de crecimiento), fueron optimizados alcanzando un grado de ajuste de 88% para todas las condiciones iniciales, usando glicerol USP. Adicionalmente, los parametros cineticos son presentados como funcion del pH inicial y la concentracion inicial de sustrato. EnglishThis study show the capability of Lactobacillus rhamnosus ATCC 7469 to produce lactic acid using crude glycerol from biodiesel production as carbon source; in addition, a kinetic model that describes the behaviour of the fermentation process using USP glycerol as substrate was proposed and developed. The strain was adapted to the new carbon source by doing successive cultures, the substrate conversion was up to 94.5% after 24 hours of fermentation using crude glycerol as under initial conditions of substrate concentration (crude glycerol) and pH of 8 g/L and 6.5, respectively. Then, the influence of initial pH (pHo) and concentration of substrate (So) were evaluated by fermentation tests of USP glycerol. The optimal value of volumetric lactic acid productivity (Qv) achieved from this study was 0.087 g·L-1·h-1 for initial pHo = 6.5 and initial substrate concentration So = 6 g/L. Lastly, the kinetics parameters of an unstructured and not segregated model (Aiba type equation for growth rate expression), were adjusted with an average fit degree of 88% for all the initial conditions, using USP glycerol. In addition, the kinetic parameters are laid out as function of initial pH and substrate concentration. portuguesEste trabalho demonstrou a capacidade do Lactobacillus rhamnosus ATCC 7469 para a producao de acido lactico usando glicerol quando oriundo da industria do biodiesel como fonte de carbono, adicionalmente, um modelo cinetico foi proposto e desenvolvido com a finalidade de descrever o processo de fermentacao usando glicerol USP como substrato. A cepa foi adaptada a nova fonte de carbono utilizando culturas sucessivas, a conversao do substrato foi de ate ","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87803738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of a wax deposition model in oil production pipelines","authors":"Diego Fernando Bautista Parada, D. Fuentes, Paola Gauthier Maradei, Arlex Chaves Guerrero","doi":"10.29047/01225383.25","DOIUrl":"https://doi.org/10.29047/01225383.25","url":null,"abstract":"espanolEl objetivo de este trabajo es estudiar el proceso de deposicion de parafinas sobre la superficie interna de las tuberias de produccion de petroleo y la influencia de parametros como la velocidad de flujo y la temperatura de la pared sobre el espesor del deposito para un crudo ligero con alto contenido parafinico considerando tres condiciones de frontera sobre la pared de la tuberia; dos de las cuales suponen un perfil de temperatura en la frontera, hecho que no ha sido considerado en trabajos anteriores, y la tercera un valor constante. El analisis se realizo suponiendo condiciones seudo-estables en la fase fluida. El metodo de diferencias finitas se aplico para resolver el sistema de ecuaciones diferenciales y la solucion se llevo a cabo numericamente utilizando el lenguaje de programacion C++. El modelo fue validado a partir de los resultados experimentales reportados por Singh et al. (2000) y posteriormente utilizados para simular el crecimiento de los depositos de parafina como una funcion de la velocidad de flujo y la temperatura de la tuberia. Los resultados mostraron que el aumento de la velocidad de flujo reduce el maximo espesor del deposito, pero este se extiende sobre una distancia mas larga sobre la tuberia cuando se considera una temperatura de pared constante o cuando se considera el gradiente de temperatura axial con pendiente positiva; mientras que se observa el efecto contrario cuando se considera el gradiente de temperatura axial con pendiente negativa. portuguesEsse trabalho objetiva estudar o processo de deposicao de parafinas sobre a superficie interna dos tubos de producao de petroleo e a influencia de parâmetros como a velocidade de fluxo e a temperatura da parede sobre a espessura do deposito para um petroleo leve com alto conteudo parafinico considerando tres condicoes fronteira sobre a parede do tubo; sendo que dois delas pressupoem um perfil de temperatura na fronteira, fato que nao foi considerado em trabalhos anteriores, e a terceira um valor constante. A analise foi feita com a presuncao de condicoes pseudo-estaveis na fase fluida. O metodo de diferencas finitas foi aplicado para a resolucao do sistema de equacoes diferenciais e a solucao foi atingida de forma numerica utilizando a linguagem de programacao C++. O modelo foi validado com base nos resultados experimentais relatados por Singh et al. (2000) e posteriormente utilizados para a simulacao do crescimento dos depositos de parafina como uma funcao da velocidade de fluxo e da temperatura do tubo. Os resultados demonstraram que o aumento da velocidade de fluxo reduz a espessura maxima do deposito, no entanto, ele se estende sobre uma distância maior sobre o tubo quando considerada a temperatura de parede constante ou o gradiente de temperatura axial com inclinacao positiva; enquanto se verifica o efeito contrario quando considerado o gradiente de temperatura axial com inclinacao negativa. EnglishThis work is aimed to study the wax deposition process on th","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82605199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ENVIRONMENTAL SENSITIVITY INDEX FOR OIL SPILLS IN MARINE AND COASTAL AREAS IN COLOMBIA","authors":"D. Gil-Agudelo, Ramón-Alberto Nieto-Bernal, Diana M. Ibarra-Mojica, Ana-María Guevara-Vargas, E. Gundlach","doi":"10.29047/01225383.24","DOIUrl":"https://doi.org/10.29047/01225383.24","url":null,"abstract":"The implementation of tools to prevent and mitigate the potential impact of oil spills in marine and coastal environments is an issue of interest not only for oil and gas companies, but also for environmental authorities and the general society of the country as they seek to avoid possible damages to the natural realm and human-use resources of an area affected by these events. One of these tools that is useful both for planning and response of oil spills is the Environmental Sensitivity Index (ESI), which establishes the degree of sensitivity of different coastal areas depending on their geophysics, hydrodynamic and biological characteristics. ESI contributes and prioritize to improve response actions to minimize potential environmental impacts. This index is a key element for the construction of the Environmental Sensitivity Maps for oil spills (ESM), but for its correct application, it has to be adjusted to the needs and conditions of each country. This paper presents the adaptation of the ESI for Colombian coastal environments, which has been constructed through the revision of experiences in other countries and the collaboration of national and international experts during workshops. The ESI presented here is the main tool for the elaboration of ESM for Colombia, an instrument that will help in the planning and response process for oil spills in the country.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87070962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EXPERIMENTAL COMPARISON FOR THE CALCULATION OF ROCK WETTABILITY USING THE AMOTT-HARVEY METHOD AND A NEW VISUAL METHOD","authors":"John-Alexander León-Pabón, Tito-Javier Mejía-Pilonieta, Luis-Felipe Carrillo-Moreno, Hernando Buendía-Lombana, J. Zapata, Carlos-Andrés Díaz-Prada","doi":"10.29047/01225383.30","DOIUrl":"https://doi.org/10.29047/01225383.30","url":null,"abstract":"This article provides the results of the implementation of the Amott-Harvey method (quantitative) and the visual method (qualitative) to determine the wettability of the rock in core samples from the Mugrosa Formation of the Colorado Field, in order to learn about the distribution of fluids in the reservoir, as this property affects various aspects of the production performance thereof. Wettability is determined first by restoring the wettability of the samples, for 200 hours and 1000 hours at reservoir conditions (T = 144°F and P = 1350 psi). After that, rock wettability is calculated using the AmottHarvey method, obtaining results of neutral wettability. It is then determined by the visual method for comparison purposes, in order to conclude that rock wettability is neutral. It is important to emphasize that the visual method is of great relevance, because it provides a real view of how the fluids are distributed within the rock to obtain representative results, in order to make decisions that optimizes the production of the field under study.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86649863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}