Extractive distillation: Advances in conceptual design, solvent selection, and separation strategies

doi:10.1016/j.cjche.2018.08.018

Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (6): 1247-1256.DOI: 10.1016/j.cjche.2018.08.018

• Special Issue: Separation Process Intensification of Chemical Engineering • Previous Articles Next Articles

Extractive distillation: Advances in conceptual design, solvent selection, and separation strategies

Shirui Sun¹, Liping Lü^2,3, Ao Yang¹, Shun'an Wei¹, Weifeng Shen¹

1 School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;
2 School of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, Fuling 408100, China;
3 Collaborative Innovation Center for Green Development in Wuling Moutain Area, Yangtze Normal University, China

Received:2018-06-15 Revised:2018-08-28 Online:2019-08-19 Published:2019-06-28
Contact: Weifeng Shen
Supported by:
Supported by the National Natural Science Foundation of China (No. 21878028, 21606026), the Fundamental Research Funds for the Central Universities (No.106112017CDJQJ228809), Chongqing Technological Innovation and Application Demonstration for Social and Livelihood development (No.cstc2018jscx-msybX0336), Chongqing Research Program of Basic Research and Frontier Technology (No. CSTC2016JCYJA0474), and Hundred Talents Program of Chongqing University.

Extractive distillation: Advances in conceptual design, solvent selection, and separation strategies

Shirui Sun¹, Liping Lü^2,3, Ao Yang¹, Shun'an Wei¹, Weifeng Shen¹

1 School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;
2 School of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, Fuling 408100, China;
3 Collaborative Innovation Center for Green Development in Wuling Moutain Area, Yangtze Normal University, China

通讯作者: Weifeng Shen
基金资助:
Supported by the National Natural Science Foundation of China (No. 21878028, 21606026), the Fundamental Research Funds for the Central Universities (No.106112017CDJQJ228809), Chongqing Technological Innovation and Application Demonstration for Social and Livelihood development (No.cstc2018jscx-msybX0336), Chongqing Research Program of Basic Research and Frontier Technology (No. CSTC2016JCYJA0474), and Hundred Talents Program of Chongqing University.

Abstract

Abstract: Extractive distillation (ED) is one of the most promising approaches for the separation of the azeotropic or closeboiling mixtures in the chemical industry. The purpose of this paper is to provide a broad overview of the recent development of key aspects in the ED process involving conceptual design, solvent selection, and separation strategies. To obtain the minimum entrainer feed flow rate and reflux ratio for the ED process, the conceptual design of azeotropic mixture separation based on a topological analysis via thermodynamic feasibility insights involving residue curve maps, univolatility lines, and unidistribution curves is presented. The method is applicable to arbitrary multicomponent mixtures and allows direct screening of design alternatives. The determination of a suitable solvent is one of the key steps to ensure an effective and economical ED process. Candidate entrainers can be obtained from heuristics or literature studies while computer aided molecular design (CAMD) has superiority in efficiency and reliability. To achieve optimized extractive distillation systems, a brief review of evaluation method for both entrainer design and selection through CAMD is presented. Extractive distillation can be operated either in continuous extractive distillation (CED) or batch extractive distillation (BED), and both modes have been well-studied depending on the advantages in flexibility and low capital costs. To improve the energy efficiency, several configurations and technological alternatives can be used for both CED and BED depending on strategies and main azeotropic feeds. The challenge and chance of the further ED development involving screening the best potential solvents and exploring the energy-intensive separation strategies are discussed aiming at promoting the industrial application of this environmentally friendly separation technique.

Key words: Extractive distillation, Separation strategies, Solvent selection, Conceptual design

摘要： Extractive distillation (ED) is one of the most promising approaches for the separation of the azeotropic or closeboiling mixtures in the chemical industry. The purpose of this paper is to provide a broad overview of the recent development of key aspects in the ED process involving conceptual design, solvent selection, and separation strategies. To obtain the minimum entrainer feed flow rate and reflux ratio for the ED process, the conceptual design of azeotropic mixture separation based on a topological analysis via thermodynamic feasibility insights involving residue curve maps, univolatility lines, and unidistribution curves is presented. The method is applicable to arbitrary multicomponent mixtures and allows direct screening of design alternatives. The determination of a suitable solvent is one of the key steps to ensure an effective and economical ED process. Candidate entrainers can be obtained from heuristics or literature studies while computer aided molecular design (CAMD) has superiority in efficiency and reliability. To achieve optimized extractive distillation systems, a brief review of evaluation method for both entrainer design and selection through CAMD is presented. Extractive distillation can be operated either in continuous extractive distillation (CED) or batch extractive distillation (BED), and both modes have been well-studied depending on the advantages in flexibility and low capital costs. To improve the energy efficiency, several configurations and technological alternatives can be used for both CED and BED depending on strategies and main azeotropic feeds. The challenge and chance of the further ED development involving screening the best potential solvents and exploring the energy-intensive separation strategies are discussed aiming at promoting the industrial application of this environmentally friendly separation technique.

关键词: Extractive distillation, Separation strategies, Solvent selection, Conceptual design

Shirui Sun, Liping Lü, Ao Yang, Shun'an Wei, Weifeng Shen. Extractive distillation: Advances in conceptual design, solvent selection, and separation strategies[J]. Chinese Journal of Chemical Engineering, 2019, 27(6): 1247-1256.

Shirui Sun, Liping Lü, Ao Yang, Shun'an Wei, Weifeng Shen. Extractive distillation: Advances in conceptual design, solvent selection, and separation strategies[J]. 中国化学工程学报, 2019, 27(6): 1247-1256.

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Extractive distillation: Advances in conceptual design, solvent selection, and separation strategies

Extractive distillation: Advances in conceptual design, solvent selection, and separation strategies

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