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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   (539 HTML20 PDF(pc) (925KB)(196)  

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.12 Thermally coupled non-clear cutting process of front-end deethanizer separation technique (C4S as absorbent)
Extracts from the Article
在采用部分切割技术、假设没有粗乙烯返回MTP反应器的前提下, 讨论前脱乙烷流程碳二系统(脱乙烷塔和乙烯精馏塔)热耦合的可能性,具体优选流程如图12所示,采用混合碳四C4S做吸收剂。
对图12流程进行模拟计算、优化操作参数和换热网络,双机功耗、冷却水和蒸汽消耗见表5,图10和图12所示前脱乙烷流程标准燃料油消耗对比见图13。
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