Application of catalytic distillation for the aldol condensation of acetone: the effect of the mass transfer and kinetic rates on the yield and selectivity

Huang, C; Ng, Flora T. T.; Rempel, Garry L.

doi:10.1016/s0009-2509(00)00147-0

Cited by 14 publications

(16 citation statements)

References 12 publications

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“…This indicates that the production of MO is kinetically controlled at a low reflux flow rate of 10 g/min, whereas the DAA yield is limited by the external liquid-solid mass transfer. These conclusions are in agreement with the experimental data by Podrebarac et al 6 and the analysis of Huang et al 32 To achieve a high conversion of Ac with a high selectivity of DAA, it is suggested that a high reflux flow rate of 26 g/min should be used to eliminate the effect of external liquid-solid mass transfer at 91 mL of catalyst and a feed rate of 2.1 g/min.…”

Section: Effect Of Mass Transfersupporting

confidence: 90%

Process Analysis for the Production of Diacetone Alcohol via Catalytic Distillation

Zheng

Rempel

2003

Ind. Eng. Chem. Res.

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A three-phase nonequilibrium model developed recently in our laboratory was used to provide the optimal design and operating conditions of a catalytic distillation (CD) column for the aldol condensation of acetone. The influence of reflux flow rate, reflux ratio, reaction temperature, feed location, catalyst packing height, packed height of the nonreactive zones, reaction zone location, amount of catalyst, feed rate, and mass transfer on the conversion and product selectivity was investigated. The analysis and graphical representations were used to provide the optimal design and operating conditions of the CD column. Results obtained from our pilot CD column for the production of diacetone alcohol using Amberlite IRA-900 as a catalyst are in excellent agreement with the model predictions. This illustrates that this three-phase nonequilibrium model is effective for design, and this systematic modeling methodology can be used to provide the optimal design and operation parameters of a CD process.

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Section: Effect Of Mass Transfersupporting

confidence: 90%

Process Analysis for the Production of Diacetone Alcohol via Catalytic Distillation

Zheng

Rempel

2003

Ind. Eng. Chem. Res.

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“…the diffusion of acetone to or diacetone alcohol from the surface of the catalysts is the slowest step [62]. According to this model, an effective solid-liquid mass transfer rate is needed for avoiding the decomposition of diacetone alcohol into acetone and mesityl oxide [63].…”

Section: Acetone Self-condensation In the Liquid Phasementioning

confidence: 99%

Base-Catalyzed Reactions in Biomass Conversion: Reaction Mechanisms and Catalyst Deactivation

Faba

Dı́az

Ordóñez

2016

Green Chemistry and Sustainable Technology

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Although less studied than acid-catalyzed reactions, mainly because of their marginal interest in petrochemical processes, base-catalyzed reactions (either homogeneous or heterogeneous) play a key role in the upgrading of biomass-derived platform molecules. As in most of the chemical processes, the replacement of homogeneous catalysts by heterogeneous catalysts is of key interest. This article reviews the state of the art in the most important base-catalyzed reactions in the biofuel manufacture (biodiesel from triglycerides) and the upgrading of biomass-derived platform molecules (such as acetone, ethanol, furfural, 5-hydroxymethylfurfural, or acetic acid). Transesterification reactions, aldol condensation (alone or in combination with other reactions), and ketonization are the main reactions involved in these biorefinery processes. Reviewed are the most common catalysts proposed for these reactions (mainly heterogeneous), as well as the proposed mechanisms for these reactions, and the main factors governing catalyst deactivation when used in each of these reactions.

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“…Therefore a three-phase non-equilibrium model is required to simulate the productivity of DAA and MO under process conditions where the production of DAA is mass transfer controlled. We have previously reported that the production of DAA is limited by mass transfer resistance through the catalyst bags while the production of MO is kinetically controlled [18]. According to the process analysis for the production of DAA [20], the formations of DAA and MO are both kinetically controlled when the reflux flow rate is above 26 g min −1 .…”

Section: The Aldol Condensation Of Acmentioning

confidence: 99%

“…They suggested that the MTBE process is relatively sensitive to mass transfer resistances, whereas the TAME process is not. A three-phase non-equilibrium model was developed by our group [17][18][19][20], which assumed the reaction rate and the mass transfer rate through the solid-liquid interface to be equal. In addition, the reaction heat was assumed to be equal to the heat transfer rate between the solid and liquid phases.…”

Section: Introductionmentioning

confidence: 99%

A comparison of a pseudo-homogeneous non-equilibrium model and a three-phase non-equilibrium model for catalytic distillation

Zheng

Rempel

2004

Chemical Engineering Journal

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Application of catalytic distillation for the aldol condensation of acetone: the effect of the mass transfer and kinetic rates on the yield and selectivity

Cited by 14 publications

References 12 publications

Process Analysis for the Production of Diacetone Alcohol via Catalytic Distillation

Process Analysis for the Production of Diacetone Alcohol via Catalytic Distillation

Base-Catalyzed Reactions in Biomass Conversion: Reaction Mechanisms and Catalyst Deactivation

A comparison of a pseudo-homogeneous non-equilibrium model and a three-phase non-equilibrium model for catalytic distillation

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