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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.13 Comparison of standard fuel oil consumption in conventional and thermally coupled for non-clear cutting front-end deethanizer separation
Extracts from the Article
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。
从图13可以看到,非清晰切割前脱乙烷流程的碳二系统热集成后,标准燃料油消耗相对有所降低。MTP装置乙烯产量仅为丙烯产量的1/6,非清晰切割前脱乙烷流程的碳二系统在热集成前后双机功率机会没有太大变化,严格说节能效果不很明显,但是碳二系统进行热集成可以省去一套塔顶冷凝相关设备。
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