离子液体萃取精馏技术在甲醇-碳酸二甲酯分离中的应用

doi:10.16085/j.issn.1000-6613.2016.12.049

化工进展 ›› 2016, Vol. 35 ›› Issue (12): 4082-4087.DOI: 10.16085/j.issn.1000-6613.2016.12.049

离子液体萃取精馏技术在甲醇-碳酸二甲酯分离中的应用

李骏^1,2, 何文军¹, 漆志文², 宗弘元¹, 杨为民¹

1 中国石化上海石油化工研究院绿色化工与工业催化国家重点实验室, 上海 201208;
2 华东理工大学化工学院化学工程联合国家重点实验室, 上海 200237

收稿日期:2016-05-06 修回日期:2016-06-02 出版日期:2016-12-05 发布日期:2016-12-05
通讯作者: 杨为民,博士,教授级高级工程师,主要从事分子筛催化剂和烷基化反应的研究。E-mail:yangwm.sshy@Sinopec.com。
作者简介:李俊(1988-),男,博士,研究方向为化工分离过程及CO₂捕集。E-mail:ljsmail@163.com。

Separation of methanol and dimethyl carbonate azeotrope by extractive distillation using ionic liquid as solvent

LI Jun^1,2, HE Wenjun¹, QI Zhiwen², ZONG Hongyuan¹, YANG Weimin¹

1 State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, SINOPEC Shanghai Research Institute of Petrochemical Technology, Shanghai 201208, China;
2 State Key Laboratory of Chemical Engineering, School of Chemical Industry, East China University of Science and Technology, Shanghai 200237, China

Received:2016-05-06 Revised:2016-06-02 Online:2016-12-05 Published:2016-12-05

摘要/Abstract

摘要： 针对甲醇-碳酸二甲酯共沸物分离难题，采用萃取精馏技术并以离子液体3-辛基-1-甲基四氟硼酸盐（[omim][BF₄]）为萃取剂进行流程设计和Aspen Plus模拟。根据气液相平衡数据回归了NRTL气液模型的二元交互参数，确保模拟结果准确。通过优化萃取剂用量、最佳回流比、进料位置和闪蒸塔的工艺条件等操作参数，实现了甲醇和碳酸二甲酯有效分离，并使产品质量分数达到99.5%以上。通过与草酸二甲酯作为萃取剂的工艺进行对比，发现[omim][BF₄]工艺对分离设备要求更低、萃取剂用量更小，且分离能耗相当。经济分析结果则表明，[omim][BF₄]工艺塔费用和填料费用分别为草酸二甲酯工艺的78%和37%，在设备投资上具有一定优势；但工艺能耗费用增加4%，萃取剂费用为草酸二甲酯费用的6.5倍，最终年总花费与草酸二甲酯工艺相当。因此，[omim][BF₄]工艺用于甲醇-碳酸二甲酯萃取精馏具有一定的应用前景。

关键词: 甲醇, 碳酸二甲酯, 离子液体, 萃取, 模拟

Abstract: Focused on separation of methanol(MEOH)and dimethyl-carbonate(DMC)azeotrope,the extractive distillation process employing ionic liquid 1-octyl-3-methylimidazolium tetrafluoroborate([omim] [BF₄]) as solvent was designed and simulated based on Aspen Plus. To verify the reliability of simulation results,binary interaction parameters were correlated by NRTL using vapor-liquid equilibrium data. The flow rate of[omim] [BF₄],reflux ratio,feed stage and operation conditions of flash tower were optimized to obtain MeOH and DMC with purity above 99.5%,respectively. Compared to the dimethyl oxalate(DMO)process,[omim] [BF₄] process presents lower requirements for towers,lower solvent and energy consumption. Economy analysis indicates that the column cost and packing cost of[omim] [BF₄] only account for 78% and 37% of DMO process respectively,while the energy consumption increase 4% and solvent cost is 6.5 times higher than DMO process. As a result,the total annual cost of[omim] [BF₄] is comparable with DMO process. Hence,the[omim] [BF₄] process shows application potential in MeOH and DMC separation.

Key words: methanol, dimethyl carbonate, ionic liquids, extraction, simulation

中图分类号:

TQ028.3

李骏, 何文军, 漆志文, 宗弘元, 杨为民. 离子液体萃取精馏技术在甲醇-碳酸二甲酯分离中的应用[J]. 化工进展, 2016, 35(12): 4082-4087.

LI Jun, HE Wenjun, QI Zhiwen, ZONG Hongyuan, YANG Weimin. Separation of methanol and dimethyl carbonate azeotrope by extractive distillation using ionic liquid as solvent[J]. Chemical Industry and Engineering Progree, 2016, 35(12): 4082-4087.

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离子液体萃取精馏技术在甲醇-碳酸二甲酯分离中的应用

Separation of methanol and dimethyl carbonate azeotrope by extractive distillation using ionic liquid as solvent

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