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采用La改性的SAPO-34为催化剂,考察了不同La负载量时的甲醇制烯烃反应性能。针对甲醇制取低碳烯烃工艺反应气体特点,用过程模拟分析采用油吸收的中冷分离方法回收反应气体中的乙烯。本文对三种吸收剂(丙烷、混合碳四、碳五+)的吸收效果、吸收剂用量、吸收剂带出量进行了对比。结果表明,La改性的SPAO-34分子筛在MTO反应中表现出更优异的乙烯、丙烯选择性。在中冷操作条件下,采用适当的吸收剂可以回收脱甲烷塔顶气中的乙烯,实现高乙烯回收率。经过对丙烷、混合碳四、碳五+不同吸收剂的比选,丙烷作为吸收剂综合效果最优。此方法节省了乙烯制冷系统和反应气低温预冷系统,降低了能耗,节省了投资。
Using La-modified SAPO-34 as catalyst, the methanol-to-olefins reactivity under different La loadings was investigated. Aiming at the characteristics of the reaction gas of low carbon olefin from methanol, the process simulation was used to recover the ethylene in the reaction gas by using the method of cold absorption of oil absorption. In this paper, three kinds of absorbent (propane, carbon four mixed, carbon five +) absorption effect, the amount of absorbent, the amount of absorbent carried out were compared. The results show that the La modified SPAO-34 zeolite exhibits more excellent ethylene and propylene selectivity in the MTO reaction. Under intercooled operating conditions, the ethylene in the demethanizer overhead gas can be recovered with an appropriate absorber to achieve high ethylene recovery. After the propane, carbon four, carbon five + different absorbents than the election, propane as an absorbent comprehensive best. This method saves the ethylene refrigeration system and the reaction gas low temperature precooling system, reduces the energy consumption and saves the investment.