摘要
针对酯交换制备过程中甲醇-碳酸二甲酯共沸体系难分离的问题,分别选择变压精馏、碳酸乙烯酯(EC)萃取精馏与乙二醇(EG)萃取精馏3种分离过程进行模拟与能量集成,对比了3种工艺流程的分离能耗,采用有效能([火用])分析方法分析了能耗最低的变压分离过程的有效能([火用])损失.结果表明,3种工艺流程的能耗EG萃取精馏>EC萃取精馏>变压精馏,碳酸二甲酯生产过程中内部循环物流能量是输入总能量的1.55倍,变压共沸分离过程的[火用]损失为7.9%。
As a kind of green solvent and chemical intermediate,dimethyl carbonate (DMC)is an important derivation of the downstream production chains of coal chemical industry,methanol (MeOH)chemical industry and CO2 chemical industry.However,the disadvantages of high energy consumption and complicated operation in the current MeOH-DMC azeotrope separation process have greatly restricted the industrial economic benefits. Concentrating on the problems of MeOH-DMC azeotropic system separation in transesterification,the process simulation and energy integration of three azeotrope separation methods had been completed,including pressure-swing distillation method,ethylene carbonate (EC) extractive distillation method and ethylene glycol (EG)extractive distillation method.And the energy consumption of three methods was compared under the same separation target,which was in the following order:EG extractive distillation method>EC extractive distillation method>pressure-swing distillation method.The operation parameters of three kinds of azeotrope separation process were determined by using sensitivity analysis method.And exergy analysis method was adopted to investigate the exergy loss in the pressure-swing azeotrope separating process which had the lowest energy consumption.The results showed that the internal circulation exergy was 1.55 times of the input total exergy in the DMC production process,and the exergy loss was about 7.9%.
作者
陈嵩嵩
董丽
张军平
成卫国
华炜
Songsong CHEN;Li DONG;Junping ZHANG;Weiguo CHENG;Wei HUA(Key Lab of Green Process and Engineering,Institute of Process Engineering,Chinese Academ of Sciences,Beijing 100090,China;School of Chemical Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;SINOPEC,Beijing Yanshan Company,Beijing 102500,China)
出处
《过程工程学报》
CAS
CSCD
北大核心
2018年第6期1307-1314,共8页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:21606237
21676274)
关键词
碳酸二甲酯
共沸物分离
过程模拟
系统集成
[火用]分析
dimethyl carbonate
azeotrope separation
process simulation
system integration
exergy analysis
