Jose Antonio Rocha Uribe - Academia.edu (original) (raw)
Uploads
Papers by Jose Antonio Rocha Uribe
Gas Separation & Purification , 1993
This paper reports a comparison of several available correlations to calculate flooding velocity ... more This paper reports a comparison of several available correlations to calculate flooding velocity and mass transfer efficiency by using the concept of height equivalent to a theoretical plate (HETP) for distillation columns filled with metallic structured packings. It is found that there are more correlations for pressure drop or gas velocity at flooding than correlations to predict HETP values, and that most of the correlations need empirical constants or exponents for their calculation. Nevertheless, these values are not reported for all the packings and all the sizes available. A case study is made for application of the proposed methods, and the results are presented and compared. A brief comment is made on each method and its ease of application.
Journal of Materials Science and Chemical Engineering
Theory and concepts of boundary layer mass transfer is applied to correlate experimental data on ... more Theory and concepts of boundary layer mass transfer is applied to correlate experimental data on extraction of essential oils from vegetable leaves and stems, using steam. From these theory, concepts and experimental data with seven systems, two correlations are developed to predict the Sherwood number and mass transfer coefficient as function of Reynolds and Schmidt numbers. From these equations, the molar flux, the amount of solute extracted, and the yield of extraction is predicted. A steam of higher temperature normally improves the mass transfer and the yield. A method to estimate the enhancement for temperature increase is proposed. The correlations developed are applied to a case with industrial size that was no part of the data for correlation generation. Theory may be applied for industrial applications.
La descripción y predicción de los flujos gas-partículas en los lechos fluidificados empleados pa... more La descripción y predicción de los flujos gas-partículas en los lechos fluidificados empleados para el craqueo catalítico a través de una simulación aporta una comprensión importante y complementaria del fenómeno real. La obtención de información ayuda a tomar decisiones orientadas al óptimo desempeño de esta unidad de proceso en cuyo seno se lleva a cabo un movimiento hidrodinámico, transferencia de calor y efectos reactivos. La simulación es una herramienta muy útil y tiene un gran alcance de aplicaciones. La mayoría de los problemas de dinámica de fluidos son complejos y difíciles de analizar, tanto teórica como experimentalmente. La Dinámica de Fluidos Computacional, DFC (CFD por sus siglas en inglés) permite predecir y visualizar patrones de flujo de fluidos, disminuyendo la dependencia de los costosos modelos a escala o planta piloto y emplea los datos experimentales para validar los modelos de transferencia y ecuaciones constitutivas. En este trabajo se presenta un estudio y ...
Brazilian Journal of Chemical Engineering, 2015
In this paper, three quality or performance indices (Luyben's capacity factor, total annual costs... more In this paper, three quality or performance indices (Luyben's capacity factor, total annual costs, and annual profit) were applied for the design of a batch distillation column working at variable reflux. This work used the Fenske-Underwood-Gilliland shortcut method to solve a problem of four components (benzene, toluene, ethyl-benzene, and ortho-xylene) that needed to be separated and purified to a mole fraction of 0.97 or better. The performance of the system was evaluated using distillation columns with 10, 20, 30, 40 and 50 theoretical stages with a boil-up vapor flow set at 100 kmol/h. It was found that the annual profit was the best quality index, while the best case for variable reflux was the column with 50 stages. It was confirmed that the best case always required a reflux ratio close to the minimum.
Journal of Engineering, 2013
A short-cut method for batch distillation columns working at constant reflux was applied to solve... more A short-cut method for batch distillation columns working at constant reflux was applied to solve a problem of four components that needed to be separated and purified to a mole fraction of 0.97 or better. Distillation columns with 10, 20, 30, 40, and 50 theoretical stages were used; reflux ratio was varied between 2 and 20. Three quality indexes were used and compared: Luyben’s capacity factor, total annual cost, and annual profit. The best combinations of theoretical stages and reflux ratio were obtained for each method. It was found that the best combinations always required reflux ratios close to the minimum. Overall, annual profit was the best quality index, while the best combination was a distillation column with 30 stages, and reflux ratio’s of 2.0 for separation of benzene (i), 5.0 for the separation of toluene (ii), and 20 for the separation of ethylbenzene (iii) and purification of o-xylene (iv).
The Journal of Supercritical Fluids, 2011
The Journal of Supercritical Fluids, 2014
An equation to estimate the costs of industrial size supercritical extraction systems was develop... more An equation to estimate the costs of industrial size supercritical extraction systems was developed and used to estimate the cost of manufacturing (COM) of habanero pepper oleoresin on extraction cells ranging from 5 to 400 L. The correlation was based on quoted costs obtained for five different sizes of supercritical extraction plants, and took into consideration inflation with the use of a cost index for a chemical engineering plant. COM for habanero chili was based on experimentation developed on a cell 0.1 L.
Revista mexicana de ingeniería química
ABSTRACT
American Journal of Analytical Chemistry, 2012
The present work presents a first characterization of the oil from the Moringa (Moringa oleifera)... more The present work presents a first characterization of the oil from the Moringa (Moringa oleifera) kernel as a potential candidate for biodiesel production. Moringa is an indigenous tree in the Yucatan Peninsula in Mexico, where there is a nascent biodiesel industry. Several extraction methods are compared in terms of the extraction yields, including solvent extraction (n-hexane and ethanol), and supercritical extraction (Sc-CO 2). The results are also compared against previously reported data. For supercritical extraction pressures of 200 to 400 bar and temperatures of 40˚C and 60˚C were tested. Gas Chromatography analysis reveals that the main fatty acids in Moringa oil are oleic acid (69%), palmitic acid (10%) and stearic acid (8%).
Tecnología, Ciencia, Educación
Page 1. Tecnol. Ciencia Ed. (IMIQ) vol. 24 núm. 2, 2009 117 Análisis de exergía en columnas de de... more Page 1. Tecnol. Ciencia Ed. (IMIQ) vol. 24 núm. 2, 2009 117 Análisis de exergía en columnas de destilación Tecnol. Ciencia Ed. (IMIQ) 24(2): 117-126, 2009 *Autor a quien debe dirigirse la correspondencia (Recibido: Abril 30, 2009, Aceptado: Noviembre 18, 2009) ...
Gas Separation & Purification , 1993
This paper reports a comparison of several available correlations to calculate flooding velocity ... more This paper reports a comparison of several available correlations to calculate flooding velocity and mass transfer efficiency by using the concept of height equivalent to a theoretical plate (HETP) for distillation columns filled with metallic structured packings. It is found that there are more correlations for pressure drop or gas velocity at flooding than correlations to predict HETP values, and that most of the correlations need empirical constants or exponents for their calculation. Nevertheless, these values are not reported for all the packings and all the sizes available. A case study is made for application of the proposed methods, and the results are presented and compared. A brief comment is made on each method and its ease of application.
Journal of Materials Science and Chemical Engineering
Theory and concepts of boundary layer mass transfer is applied to correlate experimental data on ... more Theory and concepts of boundary layer mass transfer is applied to correlate experimental data on extraction of essential oils from vegetable leaves and stems, using steam. From these theory, concepts and experimental data with seven systems, two correlations are developed to predict the Sherwood number and mass transfer coefficient as function of Reynolds and Schmidt numbers. From these equations, the molar flux, the amount of solute extracted, and the yield of extraction is predicted. A steam of higher temperature normally improves the mass transfer and the yield. A method to estimate the enhancement for temperature increase is proposed. The correlations developed are applied to a case with industrial size that was no part of the data for correlation generation. Theory may be applied for industrial applications.
La descripción y predicción de los flujos gas-partículas en los lechos fluidificados empleados pa... more La descripción y predicción de los flujos gas-partículas en los lechos fluidificados empleados para el craqueo catalítico a través de una simulación aporta una comprensión importante y complementaria del fenómeno real. La obtención de información ayuda a tomar decisiones orientadas al óptimo desempeño de esta unidad de proceso en cuyo seno se lleva a cabo un movimiento hidrodinámico, transferencia de calor y efectos reactivos. La simulación es una herramienta muy útil y tiene un gran alcance de aplicaciones. La mayoría de los problemas de dinámica de fluidos son complejos y difíciles de analizar, tanto teórica como experimentalmente. La Dinámica de Fluidos Computacional, DFC (CFD por sus siglas en inglés) permite predecir y visualizar patrones de flujo de fluidos, disminuyendo la dependencia de los costosos modelos a escala o planta piloto y emplea los datos experimentales para validar los modelos de transferencia y ecuaciones constitutivas. En este trabajo se presenta un estudio y ...
Brazilian Journal of Chemical Engineering, 2015
In this paper, three quality or performance indices (Luyben's capacity factor, total annual costs... more In this paper, three quality or performance indices (Luyben's capacity factor, total annual costs, and annual profit) were applied for the design of a batch distillation column working at variable reflux. This work used the Fenske-Underwood-Gilliland shortcut method to solve a problem of four components (benzene, toluene, ethyl-benzene, and ortho-xylene) that needed to be separated and purified to a mole fraction of 0.97 or better. The performance of the system was evaluated using distillation columns with 10, 20, 30, 40 and 50 theoretical stages with a boil-up vapor flow set at 100 kmol/h. It was found that the annual profit was the best quality index, while the best case for variable reflux was the column with 50 stages. It was confirmed that the best case always required a reflux ratio close to the minimum.
Journal of Engineering, 2013
A short-cut method for batch distillation columns working at constant reflux was applied to solve... more A short-cut method for batch distillation columns working at constant reflux was applied to solve a problem of four components that needed to be separated and purified to a mole fraction of 0.97 or better. Distillation columns with 10, 20, 30, 40, and 50 theoretical stages were used; reflux ratio was varied between 2 and 20. Three quality indexes were used and compared: Luyben’s capacity factor, total annual cost, and annual profit. The best combinations of theoretical stages and reflux ratio were obtained for each method. It was found that the best combinations always required reflux ratios close to the minimum. Overall, annual profit was the best quality index, while the best combination was a distillation column with 30 stages, and reflux ratio’s of 2.0 for separation of benzene (i), 5.0 for the separation of toluene (ii), and 20 for the separation of ethylbenzene (iii) and purification of o-xylene (iv).
The Journal of Supercritical Fluids, 2011
The Journal of Supercritical Fluids, 2014
An equation to estimate the costs of industrial size supercritical extraction systems was develop... more An equation to estimate the costs of industrial size supercritical extraction systems was developed and used to estimate the cost of manufacturing (COM) of habanero pepper oleoresin on extraction cells ranging from 5 to 400 L. The correlation was based on quoted costs obtained for five different sizes of supercritical extraction plants, and took into consideration inflation with the use of a cost index for a chemical engineering plant. COM for habanero chili was based on experimentation developed on a cell 0.1 L.
Revista mexicana de ingeniería química
ABSTRACT
American Journal of Analytical Chemistry, 2012
The present work presents a first characterization of the oil from the Moringa (Moringa oleifera)... more The present work presents a first characterization of the oil from the Moringa (Moringa oleifera) kernel as a potential candidate for biodiesel production. Moringa is an indigenous tree in the Yucatan Peninsula in Mexico, where there is a nascent biodiesel industry. Several extraction methods are compared in terms of the extraction yields, including solvent extraction (n-hexane and ethanol), and supercritical extraction (Sc-CO 2). The results are also compared against previously reported data. For supercritical extraction pressures of 200 to 400 bar and temperatures of 40˚C and 60˚C were tested. Gas Chromatography analysis reveals that the main fatty acids in Moringa oil are oleic acid (69%), palmitic acid (10%) and stearic acid (8%).
Tecnología, Ciencia, Educación
Page 1. Tecnol. Ciencia Ed. (IMIQ) vol. 24 núm. 2, 2009 117 Análisis de exergía en columnas de de... more Page 1. Tecnol. Ciencia Ed. (IMIQ) vol. 24 núm. 2, 2009 117 Análisis de exergía en columnas de destilación Tecnol. Ciencia Ed. (IMIQ) 24(2): 117-126, 2009 *Autor a quien debe dirigirse la correspondencia (Recibido: Abril 30, 2009, Aceptado: Noviembre 18, 2009) ...