Insight into separation of azeotrope in wastewater to achieve cleaner production by extractive distillation and pressure-swing distillation based on phase equilibrium

被引:28
|
作者
Wang, Yinglong [1 ]
Zhang, Hongru [1 ]
Yang, Xiao [1 ]
Shen, Yuanyuan [1 ]
Chen, Zhengrun [1 ]
Cui, Peizhe [1 ]
Wang, Lei [2 ]
Meng, Fanqing [1 ]
Ma, Yixin [3 ]
Gao, Jun [3 ]
机构
[1] Qingdao Univ Sci & Technol, Coll Chem Engn, 53 Zhengzhou Rd, Qingdao 266042, Peoples R China
[2] Qingdao Univ Sci & Technol, Coll Chem & Mol Engn, Taishan Scholar Adv & Characterist Discipline Tea, Key Lab Ecochem Engn, Qingdao 266042, Peoples R China
[3] Shandong Univ Sci & Technol, Coll Chem & Environm Engn, 579 Qianwangang Rd, Qingdao 266590, Peoples R China
基金
中国国家自然科学基金;
关键词
Experimental validation; Intermediate-boiling solvent; Sequential iteration method; Process design; Energy-saving; VAPOR-LIQUID-EQUILIBRIUM; ENERGY-CONSUMPTION; CO2; EMISSIONS; THERMODYNAMIC CONSISTENCY; TERNARY AZEOTROPE; HEAT INTEGRATION; IMPROVED DESIGN; MIXTURE; SYSTEMS; TETRAHYDROFURAN;
D O I
10.1016/j.jclepro.2020.124213
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
There are a large number of azeotropes in the binary system of alkanes and alcohols in the industrial wastewater from the reaction of vanadium pentoxide with alkanes to produce alkylvanadate. In order to protect the environment, utilize resources and clean production, the extractive distillation process with high boiling solvent as extractant is usually used to separate the azeotropes in industrial products. However, some intermediate-boiling solvents compared with the two key components to be separated are used as extractant in extractive distillation. In this work, the binary azeotropic system of n-heptane and isoamyl alcohol in wastewater was separated by extractive distillation with intermediate-boiling solvents, pressure-swing distillation and pressure-swing distillation with thermal integration. The binary interaction parameters of isoamyl alcohol and butyl acetate were obtained by correlating and regressing the experimental data of vapor-liquid equilibrium at atmospheric pressure. Taking total annual cost minimum as the objective function, the optimal design parameters of the three processes were obtained by sequential iteration method. Compared with the extractive distillation and pressure-swing distillation, pressure-swing distillation with thermal integration can save the cost up to 29.38%, increase the thermodynamic efficiency up to 445.39%, reduce the global warming potential up to 39.34% and the decrease the acidification potential up to 39.34%. This work provides an effective reference for better separation of azeotropes and wastewater treatment. (C) 2020 Elsevier Ltd. All rights reserved.
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页数:13
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