前脱丙烷预切割分离MTO粗产品工艺的模拟与优化  

Simulation and optimization of MTO product separation process based on front-end depropanization and pre-segmentation

作　　者：展宝瑞 李涛[1] 马宏方[1] 应卫勇[1] 房鼎业[1] 

机构地区：[1]华东理工大学大型工业反应器工程教育部工程研究中心,上海200237

出　　处：《化工进展》2015年第7期2086-2091,共6页Chemical Industry and Engineering Progress

摘　　要：选择"前脱丙烷"流程对甲醇制烯烃粗产物进行分离。先利用高低塔脱丙烷工艺,然后经过脱甲烷塔、脱乙烷塔、乙烯精馏塔、丙烯精馏塔,最终得到聚合级的烯烃产品,其中脱甲烷工段采用"预切割-油吸收"脱甲烷工艺,使用耗能较小的中冷分离,吸收剂选择产自工艺自身的丙烷产品。丙烯精馏工段采用双塔预分流程,降低塔高。采用Aspen Plus流程模拟软件对脱甲烷工段进行模拟和优化,选用Radfrac精馏模型和RKS-BM热力学模型进行计算,对脱甲烷工艺段进料位置、塔板数、回流比进行灵敏度分析,并确定出丙烷吸收剂的用量和温度,最终得到纯度为99.98%的乙烯和99.90%的丙烯。In this work the ＂front-end depropanization＂ process to separate methanol to olefins crude products was studied. First the high and low pressure depropanizer distillation tower was utilized,then through demethanizer,deethanizer,ethylene fractionator and propylene fractionator,the paradigmatic level olefin product was obtained, in which the ＂pre-cutting-oil absorption demethanation＂ process was applied in the demethanizing section. Smaller energy was consumed through intercooling method and propane produced from the process itself was selected as absorbent. The propylene distillation section used pre-fractionator process to reduce the height of tower. Aspen Plus was utilized to simulate and optimize the demethanizer section,Radfrac distillation model and RKS-BM thermodynamic model were applied to calculate,and based on the sensitivity analysis,the section＇s feed entrance point,stage number and reflux ratio were optimized. In addition,the dosage and temperature of dimethyl methane absorbent were confirmed. Finally,ethylene at a purity degree of 99.98% and propylene at a purity degree of 99.90% were obtained.

关 键 词：ASPEN Plus模拟 甲醇制烯烃 脱甲烷塔 油吸收 

分 类 号：TQ211[化学工程—有机化工]