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Alvaro Orjuela

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Papers by Alvaro Orjuela

Research paper thumbnail of Study of the synthesis of butyl acetate. 1. catalyst selection

Ingeniería e Investigación

Research paper thumbnail of Phase equilibria in binary mixtures with monoethyl succinate

Fluid Phase Equilibria, 2011

Monoethyl succinate was produced by partial esterification of succinic anhydride with ethanol usi... more Monoethyl succinate was produced by partial esterification of succinic anhydride with ethanol using Amberlyst 15 ® as catalyst. After separation and purification, the purity of monoethyl succinate was confirmed by nuclear magnetic resonance (NMR). Vapor pressure of monoethyl succinate was measured and correlated with Antoine equation. Vapor-liquid equilibria at constant temperature were measured for the binary systems ethyl acetate + monoethyl succinate, acetic acid + monoethyl succinate, and water + monoethyl succinate at 323.15 K, and ethanol + monoethyl succinate at 313.15 K. Binary parameters for the NRTL equations were obtained by fitting experimental data using the regression tool in ASPEN Plus ® using the Hayden-O'Connell method for vapor phase fugacities. The model agrees reasonably well with the experimental data.

Research paper thumbnail of Kinetics of mixed succinic acid/acetic acid esterification with Amberlyst 70 ion exchange resin as catalyst

Chemical Engineering Journal, 2012

Liquid phase esterification of succinic acid, acetic acid and succinic/acetic acid mixtures with ... more Liquid phase esterification of succinic acid, acetic acid and succinic/acetic acid mixtures with ethanol was studied using Amberlyst 70 strong cation exchange resin as catalyst. Batch isothermal reactions were performed at different ethanol:acid molar ratios (1:1-27:1), temperatures (343-393 K) and catalyst loadings (1.0-9.3 wt% of solution). Esterification kinetics is described using both pseudo-homogeneous mole fraction and NRTL-based activity based models that take ethanol dehydration to diethyl ether into account. The models accurately predict the esterification of individual acids, and a simple additive combination of independent kinetic models provides a good description of mixed acid esterification. The kinetic models can be used in simulation of reactive distillation processes for mixed acid esterification.

Research paper thumbnail of A Reactive Distillation Process To Produce 5-Hydroxy-2-methyl-1,3-dioxane from Mixed Glycerol Acetal Isomers

Organic Process Research & Development, 2012

... Carl T. Lira†, Alvaro Orjuela‡, Lars Peereboom†, and Dennis J. Miller*†. Department of Chemic... more ... Carl T. Lira†, Alvaro Orjuela‡, Lars Peereboom†, and Dennis J. Miller*†. Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, United States. Universidad Nacional de Colombia, Ciudad Universitaria, Dept. ...

Research paper thumbnail of Study of the synthesis of butyl acetate. 1. catalyst selection

Ingeniería e Investigación

Research paper thumbnail of Phase equilibria in binary mixtures with monoethyl succinate

Fluid Phase Equilibria, 2011

Monoethyl succinate was produced by partial esterification of succinic anhydride with ethanol usi... more Monoethyl succinate was produced by partial esterification of succinic anhydride with ethanol using Amberlyst 15 ® as catalyst. After separation and purification, the purity of monoethyl succinate was confirmed by nuclear magnetic resonance (NMR). Vapor pressure of monoethyl succinate was measured and correlated with Antoine equation. Vapor-liquid equilibria at constant temperature were measured for the binary systems ethyl acetate + monoethyl succinate, acetic acid + monoethyl succinate, and water + monoethyl succinate at 323.15 K, and ethanol + monoethyl succinate at 313.15 K. Binary parameters for the NRTL equations were obtained by fitting experimental data using the regression tool in ASPEN Plus ® using the Hayden-O'Connell method for vapor phase fugacities. The model agrees reasonably well with the experimental data.

Research paper thumbnail of Kinetics of mixed succinic acid/acetic acid esterification with Amberlyst 70 ion exchange resin as catalyst

Chemical Engineering Journal, 2012

Liquid phase esterification of succinic acid, acetic acid and succinic/acetic acid mixtures with ... more Liquid phase esterification of succinic acid, acetic acid and succinic/acetic acid mixtures with ethanol was studied using Amberlyst 70 strong cation exchange resin as catalyst. Batch isothermal reactions were performed at different ethanol:acid molar ratios (1:1-27:1), temperatures (343-393 K) and catalyst loadings (1.0-9.3 wt% of solution). Esterification kinetics is described using both pseudo-homogeneous mole fraction and NRTL-based activity based models that take ethanol dehydration to diethyl ether into account. The models accurately predict the esterification of individual acids, and a simple additive combination of independent kinetic models provides a good description of mixed acid esterification. The kinetic models can be used in simulation of reactive distillation processes for mixed acid esterification.

Research paper thumbnail of A Reactive Distillation Process To Produce 5-Hydroxy-2-methyl-1,3-dioxane from Mixed Glycerol Acetal Isomers

Organic Process Research & Development, 2012

... Carl T. Lira†, Alvaro Orjuela‡, Lars Peereboom†, and Dennis J. Miller*†. Department of Chemic... more ... Carl T. Lira†, Alvaro Orjuela‡, Lars Peereboom†, and Dennis J. Miller*†. Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, United States. Universidad Nacional de Colombia, Ciudad Universitaria, Dept. ...

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