萃取-精馏耦合工艺处理环丁砜废水的流程模拟

doi:10.16085/j.issn.1000-6613.2019-0693

摘要/Abstract

摘要：

针对聚芳醚树脂聚合过程产生的环丁砜废水的处理，提出了以二氯甲烷为萃取剂的萃取-精馏耦合新工艺。选用NRTL活度系数模型，采用Aspen plus流程模拟软件对萃取-精馏耦合工艺处理环丁砜废水的过程进行模拟研究，并应用灵敏度分析工具分别对萃取塔和精馏塔进行参数优化。模拟结果表明，当萃取塔的平衡级数为7、萃取相比为1∶1、精馏塔的理论板数为5、进料位置为第3块理论板时，废水中环丁砜的浓度从100g/L降至34mg/L，同时得到质量分数为98.31%的环丁砜，环丁砜的回收率达到99.95%，处理后的水和环丁砜都能够满足在聚芳醚树脂生产过程中循环使用的要求。与现有的四效蒸发工艺相比，萃取-精馏耦合工艺的热负荷降低了约37%，具有非常好的工业应用前景。

关键词: 萃取-精馏耦合工艺, 萃取, 蒸馏, 环丁砜, 废水, 模拟

Abstract:

The extraction-distillation hybrid process for the treatment of sulfolane waste water from polyarylether resin polymerization process was developed herein. Using NRTL activity coefficient model, Aspen plus was employed to simulate the hybrid process with dichloromethane as solvent. The sensitivity analysis tools were used to optimize the parameters of extraction column and distillation column. The simulation results indicated that when the number of equilibrium stages of extraction column was 7, solvent ratio was 1∶1, the number of theoretical stages of the distillation column was 5 and the feed entered at stage 3, the sulfolane concentration of the wastewater was reduced from 100g/L to 34mg/L, and the mass fraction of recovered sulfolane was 98.31% with the recovery of 99.95%. Therefore, water and sulfolane can be recycled after treatment. Compared with the four-effect evaporation process, the heat duty of the extraction-distillation hybrid process was reduced by 37%, which had a great potential for industrial application.

Key words: extraction-distillation hybrid process, extraction, distillation, sulfolane, waste water, simulation

中图分类号:

TQ028

李战胜,丁秋霞,张守海,王锦艳,刘程,蹇锡高. 萃取-精馏耦合工艺处理环丁砜废水的流程模拟[J]. 化工进展, 2020, 39(2): 755-759.

Zhansheng LI,Qiuxia DING,Shouhai ZHANG,Jinyan WANG,Cheng LIU,Xigao JIAN. Simulation of extraction-distillation hybrid process for sulfolane waste water treatment[J]. Chemical Industry and Engineering Progress, 2020, 39(2): 755-759.

图/表 11

参考文献 9

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溶剂	沸点/℃	水中溶解度/%	毒性
二氯甲烷	39.75	2.00（20℃）	低毒
三氯甲烷	61.152	0.822（20℃）	中等毒性
1,1-二氯乙烷	57.28	0.55（20℃）	低毒
丁酮	79.64	9.90（20℃）	低毒
乙醚	34.6	微溶于水	低毒
乙酸乙酯	77.114	8.08（25℃）	低毒

溶剂	沸点/℃	水中溶解度/%	毒性
二氯甲烷	39.75	2.00（20℃）	低毒
三氯甲烷	61.152	0.822（20℃）	中等毒性
1,1-二氯乙烷	57.28	0.55（20℃）	低毒
丁酮	79.64	9.90（20℃）	低毒
乙醚	34.6	微溶于水	低毒
乙酸乙酯	77.114	8.08（25℃）	低毒

萃取剂	萃余相中的质量分数/%	萃取率%
二氯甲烷	1.12	74.75
三氯甲烷	0.78	83.80
1,1-二氯乙烷	0.51	65.95
丁酮	6.86	59.85
乙醚	6.08	18.56
乙酸乙酯	7.44	53.04

萃取剂	萃余相中的质量分数/%	萃取率%
二氯甲烷	1.12	74.75
三氯甲烷	0.78	83.80
1,1-二氯乙烷	0.51	65.95
丁酮	6.86	59.85
乙醚	6.08	18.56
乙酸乙酯	7.44	53.04

变量	数值
萃取塔平衡级数	7
萃取类型	逆流
萃取相比	1∶1
萃取温度/℃	25
萃取压力/MPa	0.1
精馏塔塔顶压力/MPa	0.1
精馏塔理论板数	5
精馏塔进料位置	3
精馏塔回流比	0.1
精馏塔塔顶采出率	0.949
精馏塔塔顶冷凝器类型	全凝器