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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.

流程 产品气压缩机/MW 丙烯压缩机/MW 冷却水消耗/(kt/h) 低压蒸汽消耗(t/h) 高压蒸汽消耗/(t/h)
顺序分离 12.80 7.66 39.60 129 139
前脱丙烷 14.00 10.01 37.165 89 162.8
前脱乙烷 13.00 8.26 37.036 90.6 143
Table 3 Utility consume of sequential separation, front-end depropanizer and front-end deethanizer processes (C4S as absorbent) (clear cutting rectification)
Extracts from the Article
对图5,6,7所示流程进行模拟计算、优化操作参数和换热网络,双机功耗、冷却水消耗、蒸汽消耗如表3所示,将表3中的公用工程消耗折算成标准燃料油消耗,如图8所示。 从图8可以看到,用C4S做吸收剂时,前脱乙烷流程分离部分的标准燃料油消耗最小。
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