摘要
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。
A new La -SAPO -34 catalyst was prepared for Methanol to Olefin （MTO） reaction. Based on the characteristics of the reaction effluent of MTO, an ethylene recovery method with absorbents in demethanizer under the condition of propylene as refrigerant is analyzed by process simulation. Three kinds of absorbents, i. e propane, mixed CA, and C5 ＋ , are applied in order to analyze the ethylene recovery, the amount of absorbents and the absorbent composition in the offgas of demethanzier. The conclusion is that the ethylene can be recovered from the demethanizer offgas with reasonable absorbent, and the recovery ratio is higher and acceptable. With the comparison of the three absorbents, the propane is the best one. The ethylene refrigeration system and the deep chilling system will not be used in the process, so the energy consumption and investment will be decreased.
出处
《稀土》
EI
CAS
CSCD
北大核心
2011年第4期46-49,共4页
Chinese Rare Earths
关键词
稀土改性
分子筛
甲醇制烯烃
吸收剂
丙烷
脱甲烷塔
rare earth
molecular sieve
methanol to olefin
absorbent
propane
d. emethanizer.
