Ciencia Tecnologia y Futuro最新文献

{"title":"Assessment of reducing sugars production from agro-industrial wastes by batch and semicontinuous subcritical water hydrolysis","authors":"Victor Fernando Marulanda Cardona, Itzayana González Ávila, Alexandra Lopez Vanegas, J. Buitrago","doi":"10.29047/01225383.267","DOIUrl":"https://doi.org/10.29047/01225383.267","url":null,"abstract":"Reducing sugars produced from agro-industrial wastes by means of hydrolysis represent a promising alternative of chemicals and energy. Yet, large scale production still struggles with several factors involving process complexity, sugars degradation, corrosion, enzyme recyclability and economic feasibility. More recently, sub and supercritical water hydrolysis has been reported for the production of reducing sugars as a readily available alternative to acid and enzymatic biomass hydrolysis. Accordingly, in this work the results of batch and semicontinuous lab scale subcritical water hydrolysis experiments of agro-industrial wastes of pea pot and corn stover are discussed. Experiments were carried in the temperature range 250 to 300 °C, pressures up to 3650 psi, residence times up to 30 minutes in batch mode operation or water flowrates up to 12 mL/min in semicontinuous mode operation. Produced sugars were assessed in the effluent of each experimental run by means of dinitrosalicilic acid method (DNS). A maximum total reducing sugar (TRS) yield of 21.8% was measured for batch pea pot subcritical water hydrolysis experiments at 300°C, 15 minutes, 3650 psi and 1:6 biomass to water mass ratio. Semicontinuous subcritical water hydrolysis of corn stover showed a maximum TRS accumulated yield of 19% at 290 °C, 1500 psi and water flowrate of 9 mL/min. The results showed the feasibility of producing reducing sugars from agro-industrial wastes currently discarded through subcritical hydrolysis.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88791380","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":"CFD simulation of HPAM EOR solutions mechanical degradation by restrictions in turbulent flow","authors":"J. Herrera, L. Prada, G. Maya, Jose Gómez, Ruben Castro, H. Quintero, Robinson Jimenez Diaz, Eduar Pérez","doi":"10.29047/01225383.255","DOIUrl":"https://doi.org/10.29047/01225383.255","url":null,"abstract":"Polymer flooding is a widely used enhanced oil recovery (EOR) technology. The purpose of the polymer is to increase water viscosity to improve reservoir sweep efficiency. However, mechanical elements of the polymer injection facilities may impact the viscosity of the polymer negatively, decreasing it drastically. Mechanical degradation of the polymer occurs in case of flow restrictions with abrupt diameter changes in valves and control systems. Such flow restrictions may induce mechanical stresses along the polymer chain, which can result in its rupture. In this research, physical experiments and numerical simulations using CFD (Computational Fluid Dynamics) were used to propose a model for estimating the mechanical degradation for the flow of polymer solutions. This technique involves the calculation of velocity gradients, pressure drawdown, and polymer degradation of the fluid through geometry restriction. The simulations were validated through polymer injection experiments. The results show that with the greater volumetric flow and lower effective diameters, there is more mechanical degradation due to polymer shearing; nonetheless, this depends on the rheology properties inherent in each polymer in an aqueous solution. \u0000This method is suitable to estimate the mechanical degradation of the polymer solution in flooding facilities and accessories. Further, the results obtained could enhance the use of the polymer, calculating its actual mechanical degradation, minimizing it, or using it to support the development of new accessories.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86418725","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":"Demand-side management strategies based on energy key perfomance indicators in real-time: Case study","authors":"Sandra Milena Téllez Gutiérrez, Oscar Germán Duarte Velasco, Javier A. Rosero García","doi":"10.29047/01225383.128","DOIUrl":"https://doi.org/10.29047/01225383.128","url":null,"abstract":"This paper sets out features of traditional Energy Key Performance Indicators (KPIs) employed in energy management programs; then, new indicators are proposed based on Advanced Metering Infrastructure (AMI) usage. These indicators make it possible to directly relate the amount of energy, type of end use and user consumption patterns. Analysis of AMI system information enables planning for differentiated Demand-Side Management (DSM) strategies. A case study developed at Universidad Nacional de Colombia - Bogota campus is presented, which proposes new Energy Key Performance Indicators in Real Time. These indicators enable information analysis and DSM strategies that are appropriate for new technologies and that are aimed at increasing energy efficiency. Additionally, this paper presents the factors that have to be taken into account when implementing KPIs (Key Performance Indicators) and the decision-making process. This results in variable overall energy savings between 5 and 40%, according to the DSM strategy implemented.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87850172","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":"Gas transport at dense phase conditions for the development of deepwater fields in the Colombian Caribbean sea","authors":"M. Simancas, Angélica María Rada Santiago, B. Vera","doi":"10.29047/01225383.131","DOIUrl":"https://doi.org/10.29047/01225383.131","url":null,"abstract":"The purpose of this article is to set out the benefits of using the dense phase gas transport in future projects in the Caribbean Sea and to verify that when operating pipelines at high pressures, more mass per unit of volume is transported, and liquid formation risks are mitigated in hostile environments and low temperatures.This study contains key data about gas production fields in deep and ultra-deep waters around the world, which serve as a basis for research and provide characteristics for each development to be contrasted with the subsea architecture proposed in this paper. Additionally, analogies are established between the target field (Gorgon-1, Kronos-1 and Purple Angel-1) and other offshore gas fields that have similar reservoir properties. Using geographic information systems, the layout of a gas pipeline and a subsea field architecture that starts in the new gas province is proposed.Finally, using a hydraulic simulation tool, the gas transport performance in dense phase is analyzed and compared with the conventional way of transporting gas by underwater pipelines, achieving up to 20 % in cost savings when dense phase is applied.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89875824","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":"Petrofacies and diagenetic processes of la Victoria formation (Early Miocene), Dina oil field, upper Magdalena valley basin, Colombia.","authors":"Juan Jose Gomez Caro, Angelica María Carreño Parra, María del Rosario P´érez Trejos, E. Pérez, Luis Fernando Peña Peña, J. Henao, C. Ríos, Luz Helena Rueda Acevedo","doi":"10.29047/01225383.120","DOIUrl":"https://doi.org/10.29047/01225383.120","url":null,"abstract":"The sandstones at the base of the Honda Group (La Victoria Formation - Early Miocene), in the Dina Field, Upper Magdalena Valley Basin (UMVB) – Colombia, which are present in the analyzed interval of the Dina Norte 27 and Dina Norte 37 wells, are composed of immature clastic rocks classified as Litharenites / Feldspathic Litharenites, due to the presence of volcanic fragments, feldspar / plagioclase and unstable minerals.They are texturally immature due to poor selection and low roundness of the detritus. The following sequence of diagenetic processes is proposed: minor compaction; grain coating by illite/smectite detritical clay, dissolution of unstable minerals, zeolite (heulandite) precipitation, partial precipitation of nonferroan calcite cement and finally chloritization of clays prior to hydrocarbon migration.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86352197","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":"CFD SIMULATION OF A PILOT PLANT DELAYED COKING REACTOR USING AN IN-HOUSE CFD CODE","authors":"Fabià Díaz, Arlex Chaves–Guerrero, P. Gauthier‐Maradei, D. Fuentes, A. Guzmán, H. Picón","doi":"10.29047/01225383.67","DOIUrl":"https://doi.org/10.29047/01225383.67","url":null,"abstract":"espanolRESUMEN Una simulacion de un reactor piloto de coquizacion retardada fue realizada empleando un codigo propio de dinamica de fluidos computacional (CFD). El reactor fue modelado como un sistema dinamico de tres fases donde el coque es una fase solida porosa, el fondo de vacio es la fase liquida y los productos destilables son la fase gaseosa. Los balances de continuidad, momento y energia propuestos para describir la dinamica del proceso de coquizacion fueron discretizados mediante el metodo de los volumenes finitos sobre una malla axisimetrica de dos dimensiones. Un algoritmo tipo PEA fue desarrollado para describir el arrastre entre las fases fluidas y un algoritmo SIMPLEC modificado llevo a cabo el acoplamiento entre la presion y la velocidad. El simulador de CFD fue programado en lenguaje C++ para sistema operativo tipo Linux; todos los graficos fueron construidos en la plataforma de visualizacion Paraview. Una corrida completa de 12 horas y el posterior enfriamiento de la cama de coque obtenida para tres fondos de vacio fue simulada, los resultados fueron comparados con datos experimentales y un buen acuerdo fue encontrado, el simulador demostro gran potencial para ser escalado a nivel industrial. EnglishABSTRACT A simulation of a pilot plant delayed coking reactor was performed using an in-house computational fluid dynamics (CFD) code. The reactor was modeled as a three-phase dynamic system where the coke is the porous solid phase, the vacuum residue the liquid phase and the distillable product the gas phase. Equations of continuity, momentum, and energy proposed to describe the coking dynamic process where discretized employing the finite volume method and the domain was defined by a 2D structured axisymmetric grid. A PEA algorithm was developed to account for the drag between the fluid phases, and a modified SIMPLEC algorithm achieved the pressure-velocity coupling. The CFD simulator was programmed in C++ code for Linux operating system; all the graphics were constructed in ParaView visualization platform. A full run of 12 hours and the cooling of the resulting coke bed for three different vacuum residues were simulated, the results were compared with experimental data and a good agreement was observed, the simulator demonstrated great potential to be scaled up to industrial level. portuguesRESUMO Foi realizada uma simulacao de uma planta piloto de um reator de coqueamento retardado aplicando um codigo interno de fluidodinâmica computacional (CFD). O reator foi modelado como um sistema dinâmico de tres fases, estando o coque em fase solida, o residuo de vacuo em fase liquida, e os destilaveis em fase gasosa. As equacoes de continuidade, de momento e de energia propostas para descrever o processo de coquemento dinâmico foram discretizadas utilizando o metodo dos volumes finitos, e a area foi definida por uma grade de eixo de simetria estruturada em 2D. Foi desenvolvido um algoritmo PEA para representar o arrasto entre as fases fluid","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86888941","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":"A SELECTION METHODOLOGY OF FLOWBACK TREATMENT TECHNOLOGIES AND WATER REUSE IN HYDRAULIC FRACTURING IN SOURCE ROCKS - A STRATEGY TO REDUCE THE ENVIRONMENTAL IMPACTS IN COLOMBIA","authors":"F. Campos, Z. Carrillo, José Manuel Usuriaga Torres","doi":"10.29047/01225383.62","DOIUrl":"https://doi.org/10.29047/01225383.62","url":null,"abstract":"espanolRESUMEN El desarrollo de yacimientos no convencionales (roca generadora) a nivel mundial intensifico el uso del fracturamiento hidraulico como tecnica de estimulacion en la industria petrolera. No obstante, la cantidad de agua requerida para su ejecucion, las restricciones legales implementadas en ciertas regiones para la aplicacion de esta tecnologia y el posible impacto generado en el ambiente, son aspectos relevantes a tener en cuenta. En este sentido, la industria petrolera inicio hace algunos anos la implementacion de tecnologias que permitan tratar el agua de retorno proveniente de estos yacimientos, con la finalidad de convertir estos volumenes residuales en activos de importancia, en posteriores etapas de fracturamiento. El ciclo del agua dentro de estas operaciones inicia con la captacion de este recurso en cuerpos superficiales, a continuacion es mezclada con los aditivos quimicos y el material propante para generar el fluido de fractura, que posteriormente es bombeado al pozo para generar las fracturas en la formacion de interes. Luego que el pozo se ha puesto en produccion, parte del agua inyectada con el fluido, sumada a una parte del agua de formacion retornan a superficie, en donde son luego tratadas o inyectadas en pozos de disposicion. Para el caso de Colombia donde el desarrollo de este tipo de yacimientos se encuentra en su etapa inicial, no se dispone de estudios relacionados con el tratamiento del agua de retorno, tema sensible en la toma de decisiones para desarrollar esta fuente energetica en el pais. En funcion de lo anterior, el presente trabajo de investigacion propone una metodologia para seleccionar la(s) tecnologia(s) que pueden tratar de manera eficiente el agua de retorno en yacimientos no convencionales en Colombia, la cual incluye la revision de los parametros tecnicos y las experiencias a escala real de cada tecnologia, los analisis de sensibilidad de cuatro indices de estabilidad del agua, la correlacion de las caracteristicas fisicoquimicas del agua de retorno de una formacion extranjera similar a una formacion colombiana y el analisis economico de las tecnologias seleccionadas. La mejor opcion surge de la mas alta eficiencia operacional al menor costo posible. portuguesRESUMO Odesenvolvimento de jazidas nao convencionais (rocha de origem) a escala mundial intensificou o uso do fracturamiento hidraulico como tecnica de estimulacao na industria petrolifera. Nao obstante, a grande quantidade de agua utilizada para sua execucao, as restricoes legais implementadas em varias regioes para uso da populacao e o possivel impacto gerado no ambiente, sao aspectos importantes para levar em mente. Neste sentido, ha algum tempo, a industria petrolifera iniciou a implementacao de tecnologias para tratar o agua de retorno derivado dessas jazidas, com o intuito de transformar estes volumes residuais em ativos de importância, em estagios subsequentes de fracturamiento. O ciclo de agua dentro destas operacoes inicia com a ","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84319789","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":"ADHESION FORCES IN ASPHALT MIXTURES AT NANOSCALE","authors":"Yuly-Fernanda López-Contreras, Arlex Chaves–Guerrero, M. Akbulut, Zhengdong Cheng, Luis-Javier Hoyos-Marín","doi":"10.29047/01225383.65","DOIUrl":"https://doi.org/10.29047/01225383.65","url":null,"abstract":"espanolRESUMEN Las fuerzas de adhesion entre asfalto y diferentes minerales fueron obtenidas empleando el microscopio de fuerza atomica (AFM). El AFM permite el estudio de la interaccion entre dos moleculas en la misma superficie o en interfaces y su comportamiento. En esta investigacion, varias muestras de asfalto con diferentes propiedades fueron puestas en contacto con puntas modificadas para el AFM. Estas puntas fueron fabricadas con minerales comunmente encontrados en los agregados empleados en mezclas asfalticas, como son en dioxido de silicio (SiO2) y el carbonato de calcio (CaCO3). El trabajo de adhesion fue obtenido empleando curvas de fuerza - distancia para cada sistema asfalto-mineral. La medicion directa de las fuerzas desarrolladas entre asfalto y agregado en la interface empleando tecnicas nanoscopicas proveen un mejor entendimiento del sistema y sus caracteristicas. Esto, sin duda alguna contribuira en la seleccion de combinaciones asfalto - agregado empleadas en mezclas asfalticas que desarrollen enlaces mas fuertes, produciendo sistemas mas resistentes a las diferentes fallas relacionadas al fenomeno de adhesion que pueden generarse en pavimentos asfalticos. EnglishABSTRACT The adhesion forces between bitumen and minerals were measured, using Atomic Force Microscopy (AFM). The AFM enables the study of the interactions between two molecules in a same surface or at interfaces and their behavior. In this case, bitumen samples with different properties were placed in contact with AFM modified tips. The tips were fabricated with minerals found in aggregates used in asphalt mixtures, like silicon dioxide (SiO2) and calcium carbonate (CaCO3). The work of adhesion was obtained measuring adhesion forces for each bitumen-mineral pair. The direct measurement of forces between asphalt and aggregates at interface level through nanoscopic techniques provides a better insight of the system and its characteristics. This will help to improve the selection of bitumen-aggregate combinations used in asphalt mixtures, obtaining systems with higher bond strength, therefore more resistant to failures. portuguesRESUMO As forcas de adesao entre o asfalto e diversos minerais foram obtidas atraves microscopio de forca atomica (AFM) O AFM possibilita o estudo entre duas moleculas na mesma superficie ou em interfaces e seu comportamento. Varias amostras de asfalto com diversas propriedades foram colocadas em contato com pontas modificadas para o AFM, nesta pesquisa. Essas pontas foram fabricadas com minerais geralmente encontrados nas adicoes empregadas em misturas asfalticas, tais como dioxido de silicio (SiO2) e o carbonato de calcio (CaCO3). O trabalho de adesao obteve-se empregando curvas de forca (distância para cada sistema asfalto-mineral). A medicao das forcas desenvolvidas entre asfalto e adicao na interface utilizando tecnicas nanoscopicas dao uma melhor compreensao do sistema e suas caracteristicas. Isso, sem duvida nenhuma, ira contribuir na sel","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79418971","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":"INFLUENCE OF ROCK MATRIX IN KINETICS OXIDATION FOR HEAVY OILS","authors":"M. Portillo","doi":"10.29047/01225383.64","DOIUrl":"https://doi.org/10.29047/01225383.64","url":null,"abstract":"espanolRESUMEN Este trabajo se centra en el estudio de la influencia de la matriz de roca en la cinetica de oxidacion a traves del analisis de experimentos cineticos realizados para un crudo pesado colombiano utilizando diferentes tipos de medio poroso: arena sintetica, cortes de perforacion, afloramiento y nucleo. El objetivo principal es evaluar el comportamiento cinetico de empaquetamientos con medios porosos diferentes a la matriz original, para determinar la factibilidad de usarlos como reemplazo de la roca original del yacimiento, manteniendo la representatividad de los resultados. La importancia radica en que la cinetica observada se utilizara para evaluar la factibilidad tecnica de la implementacion del proceso de inyeccion de aire. El diseno experimental comprende la realizacion de ensayos de celda cinetica variando solamente el medio poroso, manteniendo el mismo fluido y las mismas condiciones de operacion. Al conjunto de datos recopilado se le determinaron variables como: oxigeno consumido, oxidos de carbono producidos y relacion H/C. Los analisis realizados mostraron que es posible realizar estudios confiables de laboratorio para el proceso de inyeccion de aire utilizando empaquetamientos alternativos al nucleo del yacimiento. portuguesRESUMO Ofoco deste trabalho e o estudo da influencia da matriz de rocha na cinetica de oxidacao atraves da analise de experimentos cineticos realizados para um petroleo bruto pesado colombiano utilizando diferentes tipos de meio poroso: areia sintetica, cortes de perfuracao, afloramento e nucleo. O principal objetivo e avaliar o comportamento cinetico de empacotamentos com meios porosos diferentes a matriz original, para determinar a viabilidade de usa-los como substituicao da rocha original da jazida, mantendo a representatividade dos resultados. A importância reside em que a cinetica observada sera utilizada para avaliar a viabilidade tecnica da implantacao do processo de injecao de ar. O desenho experimental inclui a realizacao de ensaios de celula cinetica variando apenas o meio poroso, mantendo o mesmo fluxo e iguais condicoes de operacao. Ao conjunto de dados coletados foram determinadas variaveis como: oxigenio consumido, oxidos de carbono produzidos e relacao H/C. As analises realizadas mostraram que e possivel efetuar estudos laboratoriais confiaveis para o processo de injecao de ar utilizando empacotamentos alternativos ao nucleo da jazida. EnglishABSTRACT This paper focuses on the study of the influence of rock matrix on oxidation kinetics through the analysis of kinetic experiments for a Colombian heavy crude using various porous media: synthetic sand, drilling cuttings, reservoir core and outcrop. The main objective is to evaluate the kinetic behavior of packing with porous media other than the original rock matrix to determine the feasibility of using them as a replacement for the original reservoir rock, while maintaining the representativeness of the results. The importance resides on th","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83313161","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":"Production of reducing sugars from lignocellulosic kikuyu grass residues by hydrolysis using subcritical water in batch and semibatch reactors","authors":"Paola-Andrea Marulanda-Buitrago, Víctor-Fernando Marulanda-Cardona","doi":"10.29047/01225383.70","DOIUrl":"https://doi.org/10.29047/01225383.70","url":null,"abstract":"espanolRESUMEN Se estudio la hidrolisis subcritica en modo de operacion batch y semicontinuo de residuos lignocelulosicos de pasto Kikuyu. Los experimentos evaluaron el efecto de la temperatura (250-300 °C), relacion masica (6:1-30:1), presion (1 490-3 190 psi), y flujo de agua (3-9 ml/min) en la productividad de azucares reductores (RS). La produccion de azucares reductores se midio por medio del metodo DNS y la eficiencia se calculo como la relacion entre la masa de azucares reductores producida y la masa total de residuo alimentado al reactor. Una productividad maxima de RS de 9.7% se obtuvo en los experimentos batch a 300 °C, relacion masa de 30:1 y 3190 psi, mientras que una productividad acumulada de 22% se obtuvo en los experimentos semibatch a 300 °C, 2000 psi y 9 ml/min. La productividad mas baja en los experimentos batch se atribuyo al elevado tiempo de reaccion en comparacion con los experimentos semibatch, en los cuales el tiempo de reaccion no es solo mas corto sino que tambien los productos de la hidrolisis se remueven continuamente del reactor. El analisis de varianza de los datos para los experimentos batch mostro como significativa solo la interaccion entre la temperatura y la relacion masica, mientras que la presion no tuvo efecto. Una notoria disminucion de pH se midio a medida que incrementaba el tiempo de reaccion debido a la formacion de productos acidos de degradacion. Los resultados demuestran la factibilidad de producir azucares reductores a partir de residuos lignocelulosicos disponibles en grandes cantidades y actualmente desechadas sin ningun aprovechamiento por medio de hidrolisis subcritica. portuguesRESUMO Ahidrolise subcritica de residuos lignocelulosicos de vidro Kiyuku foi realizada em uma operacao de lote e semi-lote. Os experimentos avaliaram o efeito da temperatura (250-300 °C), a proporcao de massa (6:1-30:1), a pressao (1 490-3 190 psi), e o debito de agua (3-9 ml/min) no rendimento de acucares redutores (RS). A producao de acucar redutora foi estimada atraves do metodo DNS e sua eficacia foi calculada como sendo igual a proporcao entre a massa de acucares redutores produzidos e a massa total do residuo alimentado no reator. Um RS maximo de 9,7% foi calculado nos experimentos de hidrolise em lote a 300 °C, proporcao de massa de 30:1 e 3 190 psi, comparado com um RS acumulado de 22% em experimentos semi-lote a 300 °C, 2 000 psi e 9 ml/min. O menor rendimento foi atribuido ao tempo de reacao estendida nos experimentos de lote quando comparados com os experimentos de semi-lote, onde o tempo de reacao nao e so mais curto mas tambem os produtos da hidrolise sao continuamente removidos do reator. A analise da variância estatistica dos dados para os experimentos de lote mostrou apenas uma interacao significativa entre temperatura e proporcao de massa, enquanto a pressao nao teve nenhum efeito significativo. Uma diminuicao notoria em pH foi verificada com o aumento dos tempos de reacao produto da formacao de produto","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90737158","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}