Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry最新文献_第3页

Determinación de la influencia de variables de operación en la neutralización de las aguas residuales textiles con CO2 测定操作变量对纺织废水CO2中和的影响

Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry Pub Date : 2023-08-24 DOI: 10.55815/417974

Mercedes Arbona Cabrera, Isabel Cabrera Estrada, Maria Eugenia O'Farril Pie, José Antonio Fabelo Falcón

{"title":"Determinación de la influencia de variables de operación en la neutralización de las aguas residuales textiles con CO2","authors":"Mercedes Arbona Cabrera, Isabel Cabrera Estrada, Maria Eugenia O'Farril Pie, José Antonio Fabelo Falcón","doi":"10.55815/417974","DOIUrl":"https://doi.org/10.55815/417974","url":null,"abstract":"Comúnmente se emplean ácidos fuertes para la neutralización de aguas básicas, aunque generan problemas, como corrosión de equipos, alta reactividad. Se han realizado estudios para usar CO2 comprimido con ese fin. Con esta investigación se persigue determinar la influencia de variables de operación en la neutralización de las aguas residuales textiles con CO2. Se realizó un estudio experimental a nivel de laboratorio y se evaluó el comportamiento del pH. Se aplicaron métodos estadísticos de análisis de datos. El modelo pH = 12,6962 – 0,00903125*Agitación + 0,00254375*Presión*Agitación – 1,61875*Presión+ 0,000168125*Temperatura*Agitación – 0,107125*Temperatura+ 0,026875*Temperatura*Presión – 0,000046875*Temperatura*Presión*Agitación explica la relación entre el pH y las variables estudiadas así como sus interacciones. El agua residual estudiada presenta características que permiten su neutralización con el empleo del CO2. Un aumento de la presión favorece la disminución del pH, siendo esta la variable que más influye en el proceso de neutralización. Un aumento de temperatura, en el rango estudiado, propicia la reacción sin diminución notable de la solubilidad del CO2. El pH disminuye al aumentar la agitación y este efecto prevalece sobre los efectos causados por las interacciones generadas entre la presión y la agitación así como la temperatura y la agitación, manifestado por los coeficientes expresados en el modelo.","PeriodicalId":263806,"journal":{"name":"Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125071241","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}

引用次数: 0

Revisión: Bionanocompuestos a partir de fuentes renovables reforzado con nanocristales de celulosa y nanopartículas 综述:纤维素纳米晶体和纳米颗粒增强的可再生生物纳米复合材料

Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry Pub Date : 2023-08-24 DOI: 10.55815/417970

América Estefania Estrada Aparicio, R. E. Díaz de León, Pablo Acuña Vázquez, Adalí Oliva Castañeda Facio

{"title":"Revisión: Bionanocompuestos a partir de fuentes renovables reforzado con nanocristales de celulosa y nanopartículas","authors":"América Estefania Estrada Aparicio, R. E. Díaz de León, Pablo Acuña Vázquez, Adalí Oliva Castañeda Facio","doi":"10.55815/417970","DOIUrl":"https://doi.org/10.55815/417970","url":null,"abstract":"Recientemente, el desarrollo de materiales derivados de fuentes renovables se ha incrementado con el objetivo de disminuir la dependencia de materias primas fósiles y así beneficiarse de ciertos monómeros renovables con aplicaciones, que abarcan desde la biomedicina, la liberación de fármacos hasta empaques para alimentos. Los poliésteres alifáticos, principalmente el ácido poliláctico (PLA) así como las polilactonas, son polímeros biodegradables y biocompatibles con aplicaciones comerciales en el área médica debido a su empleo en biomedicina. Estos materiales requieren un adecuado desempeño en propiedades mecánicas y normalmente se hace uso de nanorefuerzos para mejorar las propiedades finales. Relacionado a esto, la nanotecnología ha abierto la puerta a una serie de aplicaciones y tecnologías novedosas, por ejemplo, las nanoestructuras bio-basadas de celulosa, representan un refuerzo prometedor y ampliamente usado en matrices poliméricas debido a las propiedades, mecánicas, térmicas y biodegradables que puede llegar a aportar a los polímeros. Por otro lado, las nanopartículas de TiO2 también son empleadas como refuerzo debido a sus aplicaciones como pigmento de bajo costo y alta efectividad, su gran área superficial proporcionando propiedades únicas como efectividad en la protección UV que pueden mejorar las propiedades físicas y mecánicas de los materiales poliméricos.","PeriodicalId":263806,"journal":{"name":"Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123375535","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}

引用次数: 0

Impact of critical point restriction on the calculation of surface tension of organic acids using group contribution models 临界点限制对用基团贡献模型计算有机酸表面张力的影响

Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry Pub Date : 2023-08-24 DOI: 10.55815/418006

I. O. Almanza-Stable, A. Bonilla-Petriciolet

{"title":"Impact of critical point restriction on the calculation of surface tension of organic acids using group contribution models","authors":"I. O. Almanza-Stable, A. Bonilla-Petriciolet","doi":"10.55815/418006","DOIUrl":"https://doi.org/10.55815/418006","url":null,"abstract":"This manuscript reports the calculation of surface tension of organic acids using new group contribution models. These models were obtained from the Jasper equation and the van der Waals principle of corresponding states. A special analysis was performed to determine the impact of incorporating the critical point restriction on the performance of tested group contribution models. This restriction was incorporated via a penalty term on the objective function used in the group contribution determination, and using the reduced temperature as the input model variable. A total of 885 experimental surface tension data points for 78 organic acids (including aliphatic, aromatic, dicarboxylic, and polyfunctional acids) were used to compare the performance of these group contribution models. The results showed that tested models calculated the surface tension of polyfunctional and aliphatic organic acids with modeling errors lower than 5%. However, the calculation of surface tension of aromatic and dicarboxylic acids was challenging for all tested models. The incorporation of critical point restriction of surface tension as a penalty term in the data processing stage did not improve the performance of tested group contribution models. Group contribution models that used the reduced temperature as an input variable showed the best performance for the calculation of the surface tension of these organic compounds. ","PeriodicalId":263806,"journal":{"name":"Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126283982","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}

引用次数: 0

Obtaining lactic acid through microbial fermentation from corn residues 玉米残渣微生物发酵制备乳酸

Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry Pub Date : 2023-08-24 DOI: 10.55815/417982

Victor Vicente Cantos-Macías, Willington Eudarico Sánchez-Piguave, Wilmer Ponce, M. Riera

{"title":"Obtaining lactic acid through microbial fermentation from corn residues","authors":"Victor Vicente Cantos-Macías, Willington Eudarico Sánchez-Piguave, Wilmer Ponce, M. Riera","doi":"10.55815/417982","DOIUrl":"https://doi.org/10.55815/417982","url":null,"abstract":"The production and kinetics of lactic acid (LA) by batch fermentation were studied, using corn residues as substrate with Lactobacillus delbrueckii spp. Bulgaricus. A factorial design was developed for the pretreatment stage of the residue and lactic fermentation to determine the best conditions for obtaining total reducing sugars and lactic acid. In the pretreatment, the best conditions were obtained by working with HCl at 3% (v/v), 75 °C, and 30 minutes of reaction. Fermentation was carried out, keeping the medium at a pH between 5.5-6, and the best working conditions were 100 µl of the microorganism, 37ºC, and 24 hours of fermentation, reaching a maximum concentration of 19.9 g/L. Kinetic models for LA production, bacterial growth, and substrate consumption were proposed. Likewise, to verify the observed data, different statistical indices were calculated to evaluate the accuracy of the models. Finally the Luedeking-Piret and logistic models, were selected as they presented the best fit to the experimental data for LA production, substrate consumption, and bacterial growth, respectively.","PeriodicalId":263806,"journal":{"name":"Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124544131","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}

引用次数: 0

Selective oxidation of alcohols promoted by cis-Dioxomolybdenum (VI) ONO Complexes 顺式二氧钼(VI) ONO配合物促进醇的选择性氧化

Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry Pub Date : 2023-03-30 DOI: 10.55815/413304

Xiaoxia Liu, Shuya Yang, Hongmei Yu, Taocui Zhang, Weili Wang

引用次数: 0

Environmental assessment of acetylene production process via calcium carbide: A case study in Sancti Spíritus 电石法生产乙炔过程的环境评价:以Sancti为例Spíritus

Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry Pub Date : 2023-03-30 DOI: 10.55815/413451

Yasmani Alba Reyes, Yoelkis Enamorado Tamayo, Julio Pedraza Gárciga, Ernesto L. Barrera

{"title":"Environmental assessment of acetylene production process via calcium carbide: A case study in Sancti Spíritus","authors":"Yasmani Alba Reyes, Yoelkis Enamorado Tamayo, Julio Pedraza Gárciga, Ernesto L. Barrera","doi":"10.55815/413451","DOIUrl":"https://doi.org/10.55815/413451","url":null,"abstract":"Currently, the generation of resources and the problems associated with them are considered to be concern issues for mankind. Acetylene is an essential resource for industrial activities in the Cuban economy and lacks an environmental assessment that establishes the potential impacts of the activities involved in the process. The present study carried out an environmental evaluation of impacts associated with the acetylene process via calcium carbide (CaC2) at the Sancti Spíritus Industrial Gases Company, Cuba. For this purpose, the Life Cycle Assessment (LCA) methodology was applied, considering a cradle-to-gate perspective. The results showed that the activity with the greatest impact was related to CaC2 (impacts up to 99.31%), followed by acetonation (impacts up to 48.84%). This behavior is due to the contribution of CaC2 and acetone production processes respectively. In the Ecosystem Quality damage category was found the highest impact. In addition, a sensitivity analysis was performed to evaluate the impact of the purity variation in the environmental profile on the damage categories, showing that electricity consumption is considered a hotspot in the process and should be controlled more effectively. The present study reports valuable information for the identification of possible environmental improvements to reduce the potential impacts of obtaining acetylene in the Cuban scenario.","PeriodicalId":263806,"journal":{"name":"Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130589577","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}

引用次数: 0

Simulación mediante DWSim de la producción de biodiesel y gasificación de biomasa de Jatropha curcas 利用DWSim模拟麻疯树生物柴油生产和生物质气化

Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry Pub Date : 2023-03-30 DOI: 10.55815/413410

Lainet Escobar Barroso, Indira Tobío-Pérez, Arael Alfonso Cardero, Ramón Piloto-Rodríguez

{"title":"Simulación mediante DWSim de la producción de biodiesel y gasificación de biomasa de Jatropha curcas","authors":"Lainet Escobar Barroso, Indira Tobío-Pérez, Arael Alfonso Cardero, Ramón Piloto-Rodríguez","doi":"10.55815/413410","DOIUrl":"https://doi.org/10.55815/413410","url":null,"abstract":"La simulación de procesos desempeña un papel importante para el desarrollo de nuevas tecnologías y permite la asistencia en el diseño, operación y optimización de plantas. En la presente investigación se simularon mediante DWSim los procesos de transesterificación del aceite de Jatropha curcas y la gasificación de la corteza de su fruto. En la simulación del proceso de producción de biodiesel se emplearon cinco etapas: preparación del metóxido, transesterificación, recuperación del alcohol, separación del glicerol, lavado y purificación del biodiesel. La simulación del proceso de gasificación se realizó mediante un modelo estequiométrico teniendo en cuenta las reacciones fundamentales presentes en las etapas de pirólisis, combustión y reducción que ocurren en un gasificador en corriente descendente. Los productos obtenidos de la transesterificación mostraron altos rendimientos: 11% de glicerol y 98% de biodiesel. La composición del gas de síntesis de la gasificación se correspondió con las reportadas en la literatura. Se obtuvo un flujo volumétrico de gas de 92,38 m3/h con un poder calórico inferior de 5,67 MJ/Nm3, con un 72% de eficiencia del proceso. Debido a las limitaciones encontradas en la simulación del proceso de gasificación, se realizó una validación en Aspen Plus que mostró igualdad de resultados entre ambos simuladores.","PeriodicalId":263806,"journal":{"name":"Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124177782","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}

引用次数: 0

Uso de extractos del tallo de Pitahaya (Hylocereus Megalanthus) en el tratamiento de aguas residuales sanitarias 火龙果茎提取物在污水处理中的应用

Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry Pub Date : 2023-03-30 DOI: 10.55815/413326

Luiggii Ricardo Vera Rodríguez, Diego Germán Segovia Cedeño, Julio Castro Carranza, A. Dueñas-Rivadeneira

{"title":"Uso de extractos del tallo de Pitahaya (Hylocereus Megalanthus) en el tratamiento de aguas residuales sanitarias","authors":"Luiggii Ricardo Vera Rodríguez, Diego Germán Segovia Cedeño, Julio Castro Carranza, A. Dueñas-Rivadeneira","doi":"10.55815/413326","DOIUrl":"https://doi.org/10.55815/413326","url":null,"abstract":"La calidad del agua es una preocupación creciente a nivel mundial considerando el incremento de contaminación antropogénica. Los procesos de coagulación natural se presentan como una alternativa atractiva para el tratamiento de aguas residuales urbanas e industriales, debido a la capacidad coagulante de diversos materiales vegetales. Por lo que la presente investigación busca evaluar la actividad coagulante de los extractos (acuosos y etanólico) obtenidos a partir del tallo de pitahaya e incremento de parámetros de calidad de agua que estos proporcionan en el tratamiento en aguas residuales sanitarias. El proceso experimental se realizó en un test de jarras de acuerdo al diseño experimental de dos factores (A: tipo de extracto; B: concentración de extractos) utilizando sulfato de aluminio como coagulante de referencia. Posterior a lo mencionado se procedió a medir las variables de respuesta mediante técnicas analíticas estandarizadas y a partir de los valores recolectados se procedió a analizar estadísticamente mediante el uso del software STATGRAPHICS Centurion XVI. Se evidenció el efecto coagulante de los extractos obtenidos a partir del tallo fresco de pitahaya amarilla (Hylocereus megalanthus) logrando así la reducción de Turbidez, Conductividad, Sólidos Totales Disueltos y Sólidos Totales Suspendidos. Los extractos (etanólico y acuoso) de Hylocereus megalanthus presentaron efectos que evidencian su potencial como coagulantes para el tratamiento de aguas residuales sanitarias.","PeriodicalId":263806,"journal":{"name":"Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131877652","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}

引用次数: 0

Voltammetric method for chemical oxygen demand in a dairy wastewater using homemade minimal instrumentation 用自制最小仪器测定乳制品废水中化学需氧量的伏安法

Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry Pub Date : 2023-03-30 DOI: 10.55815/413408

Javier Ernesto Vilasó Cadre, Daniel Benítez Fernández, Héctor Rodríguez de la Rosa, M. A. Arada Pérez

{"title":"Voltammetric method for chemical oxygen demand in a dairy wastewater using homemade minimal instrumentation","authors":"Javier Ernesto Vilasó Cadre, Daniel Benítez Fernández, Héctor Rodríguez de la Rosa, M. A. Arada Pérez","doi":"10.55815/413408","DOIUrl":"https://doi.org/10.55815/413408","url":null,"abstract":"This paper presents a voltammetric method for Chemical Oxygen Demand (COD) quantification in a dairy wastewater using homemade minimal electrochemical instrumentation. The working electrode was a carbon microdisc, the auxiliary electrode was a carbon rod, and a silver electrode was used as reference. A low-cost non-commercial potentiostat was employed. The linear working range was 1-20 g/L. Repeatability was evaluated on 10 sample quantifications, the coefficient of variation was 3.6%, lower than that obtained for the reference spectrophotometric method (8.2%). The voltammetric method did not require treatment of the sample. The trueness was evaluated by comparing the voltammetric results with the spectrophotometric method. Mean COD of 10 quantifications using low-cost voltammetry was 10.2 g/L, whereas for the spectrophotometric method it was 11.0 g/L. A Paired Sample t-Test did not show statistically significant differences between both. Detection limit was 0.6 g/L, and quantification limit was 1.8 g/L. Both are acceptable for the sample in which there is a high organic content.","PeriodicalId":263806,"journal":{"name":"Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115722630","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}

引用次数: 0

Assessment of a pedagogical model for STEM education: combining technology and collaborative tasks STEM教育教学模式评估:结合技术与协作任务

Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry Pub Date : 2023-03-30 DOI: 10.55815/413456

Estefanía Álvarez-Castillo, M. Félix, C. Bengoechea

{"title":"Assessment of a pedagogical model for STEM education: combining technology and collaborative tasks","authors":"Estefanía Álvarez-Castillo, M. Félix, C. Bengoechea","doi":"10.55815/413456","DOIUrl":"https://doi.org/10.55815/413456","url":null,"abstract":"The polymer industry was boosted in the middle of the twentieth century when industrial production was made feasible. Nowadays, it is really difficult to find many everyday objects that are not made of plastic or contain plastic parts. Thus, polymer science and technology is an essential area in the materials engineering curriculum, where traditional (e.g., extrusion) and novel (e.g., 3D-printing) processing techniques can be discussed. Two pedagogical strategies were used in the present study. In the theoretical classes, a simple model based on an everyday object (i.e., shoelaces) was used as a demonstration of the structure of polymers, while a questionnaire carried out twice was performed in seminars oriented to the resolution of case studies. ICTs were used in both sessions (i.e., Instagram and Office Excel) to assess the learning process. The students determined that this approach resulted interesting for them, which in the end increased their motivation. Both strategies were successful, as denoted by the results of this academic year compared to the previous ones. This indicates that this innovative activity is a model validated by most students, increasing the development of their competencies and their motivation","PeriodicalId":263806,"journal":{"name":"Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122984789","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}

引用次数: 0