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Research and optimization of separation technology of methanol to propylene
Zizong WANG, Hongqian LIU, Jiming WANG
CIESC Journal    2019, 70 (1): 136-145.   DOI: 10.11949/j.issn.0438-1157.20171033
Abstract   (564 HTML20 PDF(pc) (925KB)(199)  

Based on the actual equipment of 1.7 million tons/year methanol to propylene (MTP), this paper studies and optimizes the MTP separation process, draws on the experience of separation of naphtha ethylene unit, and optimizes the formation characteristics of MTP product gas. The process combination, process simulation and optimization of the separation technology are carried out together with de-methanizer tower and its exhaust gas recovery system, highly thermal coupling decarburization system (de-ethanizer and ethylene rectifying column), sorbent selection, and screen out a more suitable separation technology consisting of the following process unit: pre-cutting front-end deethanizer, recovery of de-methanizer tail gas by combination of intercooling oil absorption and throttle expansion, highly thermally coupled deethanizer system, take carbon four mixture as absorbing agent, etc.Assuming that there are no ethylene, carbon four and carbon five cycles back to the MTP reactor, the ethylene loss in the exhaust meets the design requirements, using the optimized separation technique, the dual power of the compressor and propylene compressor is 19.8 MW. The simulation results show that the optimized flow has a good application prospect.


Fig.7 Schematic diagram of front-end deethanizer separation technique (C4S as absorbent)
Extracts from the Article
针对图7所示前脱乙烷流程,讨论以下几个问题:(1)可否添加一个第二脱乙烷塔,让富吸收剂通过脱甲烷塔、第二脱乙烷塔将吸收的甲烷氢和碳二解吸出来,以打破回收的乙烯循环回路;(2)脱乙烷塔对碳三进行部分切割,让一部分碳三从脱乙烷塔塔顶进入脱甲烷塔,以减小塔顶回流回路中产品气压缩机第四段和冷箱的功率或负荷从而降低分离系统的综合能耗;(3)传统石脑油蒸汽裂解装置上采用的脱乙烷塔和乙烯精馏塔热集成技术能否用于MTP产品气前脱乙烷流程上。
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