The study on the coupled process of column distillation and vapor permeation by NaA zeolite membrane for ethanol dehydration

Gao, Xuechao; Wang, Shengxian; Wang, Jiacheng; Xu, Shufeng; Gu, Xuehong

doi:10.1016/j.cherd.2019.08.003

Cited by 10 publications

(10 citation statements)

References 32 publications

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“…It made use of the difference of the adsorption and diffusion rate between the components to achieve the high purity, so the separation performance was unlimited by the thermodynamic equilibrium between the components. In water/EtOH mixture, a high separation factor was observed in VP through the NaA membrane 29 …”

Section: Experimental Investigationmentioning

confidence: 99%

Inter‐integration reactive distillation with vapor permeation for ethyl levulinate production: Equipment development and experimental validating

Han

Gao

et al. 2021

AIChE Journal

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Ethyl levulinate, one of the main derivatives of levulinic acid (LA), is of significant potential as platform chemicals for bio‐based materials. The esterification of LA was generally carried out in a conventional batch reactor or in a conventional reactive distillation column. However, traditional methods are hard to deal with equilibrium limited reactions and azeotropic issues. Therefore, the inter‐integration reactive distillation with vapor permeation (R‐VP‐D) process, which integrated reaction, vapor permeation, and distillation into one single unit, is proposed in this paper and validated in the pilot‐scale experiments. A comparative study is made between a pilot‐scale RD column with and without VP module. Owing to the water‐selective VP membrane and the ingenious design of related apparatuses, the R‐VP‐D process reveal a superiority in LA conversion of 21.9% maximum higher than RD without VP process and removing of product water about 53.6% from VP module, which indicates its promising industrial application in process intensification field.

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Section: Experimental Investigationmentioning

confidence: 99%

Inter‐integration reactive distillation with vapor permeation for ethyl levulinate production: Equipment development and experimental validating

Han

Gao

et al. 2021

AIChE Journal

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“…The total annual cost is calculated as TAC = capitalinvestments payback period + operating cost (6) where the payback period is 3 years. The column cost is calculated as…”

Section: Performance Indicatorsmentioning

confidence: 99%

“…Until now, there have been some popular methods that deal with distillation process synthesis, including the heuristic method, evolutionary method, algorithmic method, and stochastic algorithms. In recent years, many researchers [3,4] focused their attention on distillation process to reduce energy consumption in distillation separation or improve production efficiency, for instance, the coupling of distillation and vapor permeation [5,6] or reactive-vapor permeation-distillation [7]. Although these distillation processes are beneficial to production, design and optimization of distillation sequences are still essential.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Performance of Evolutionary Algorithm by Differential Evolution for Optimizing Distillation Sequence

Liu

2022

Molecules

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Optimal synthesis of distillation sequence is a complex problem in chemical processes engineering, which involves process structure optimization and operation parameters optimization. The study of the synthesis of distillation sequence is a crucial step toward improving the efficiency of chemical processes and reducing greenhouse gas emissions. This work introduced the concept of binary tree to encode the distillation sequence. The performance of the six evolutionary algorithms was evaluated by solving a 14-component distillation sequence synthesis problem. The best algorithm was used to optimize the operation parameters of a triple-column distillation process. The total annual cost and CO2 emissions were considered as the metrics to evaluate the performance of triple-column distillation processes. As a result, NSGA-II-DE was found to be the best one of the six tested evolutionary algorithms. Then, NSGA-II-DE was applied to the distillation sequence optimization to find the best operating parameters, which led to a significant reduction in CO2 emission and total annual costs.

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“…32−34 The industrial combination of the vapor permeation of NaA zeolite membrane and distillation has been successfully achieved. 35−38 For instance, Harvianto et al 39 proposed the advantages of a cost-effective unit using a coupling distillation-VP unit for isopropyl alcohol (IPA) dehydration, while in our previous work, 40 it was found that the placement of the NaA membrane unit could enhance the operation flexibility of the column. Despite the above achievements made by the combination of NaA zeolite membrane with distillation, the coupling process of VP−distillation was still not fully understood for fuel ethanol production.…”

Section: Introductionmentioning

confidence: 99%

A Coupling Process of Distillation with Vapor Permeation and Adsorption for Production of Fuel Ethanol: A Comparative Analysis on Energy Consumption

Wang

Zhang

Zhou³

et al. 2022

Ind. Eng. Chem. Res.

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To efficiently produce fuel ethanol from fermentation broth, the distillation column was coupled with vapor permeation (VP) of a NaA zeolite membrane instead of using the adsorption technique to remove solvent water. The comparative analysis indicated that the energy efficiency was consistently higher for distillation-VP coupling, using a single-column distillation and threecolumn distillation, respectively. The best performance was obtained for the VP membrane coupling with a three-column distillation technique, where only 2.7 tons of steam per ton of fuel ethanol were consumed to produce fuel ethanol using a 3.0 wt % ethanol broth. This saved 0.25 tons of steam per ton of fuel ethanol in comparison with the results for the coupling with adsorption technique. The effect of ethanol content in broth on the energy efficiency was also investigated, which indicated that the ethanol content was a decisive factor to determine the energy consumption in the coupling techniques. The operation pressures were crucial to balance the energy consumption between columns coupled with the VP membrane. It was found that the operation pressure of the low-pressure column was the decisive factor to the whole energy efficiency, while the pressure of the high-pressure column was preferably adjusted according to practical production due to fewer disturbances in the system. This work benefits the process design for production of fuel ethanol from fermentation broth.

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The study on the coupled process of column distillation and vapor permeation by NaA zeolite membrane for ethanol dehydration

Cited by 10 publications

References 32 publications

Inter‐integration reactive distillation with vapor permeation for ethyl levulinate production: Equipment development and experimental validating

Inter‐integration reactive distillation with vapor permeation for ethyl levulinate production: Equipment development and experimental validating

Enhancing the Performance of Evolutionary Algorithm by Differential Evolution for Optimizing Distillation Sequence

A Coupling Process of Distillation with Vapor Permeation and Adsorption for Production of Fuel Ethanol: A Comparative Analysis on Energy Consumption

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