为研究甲烷氧化偶联制乙烯(oxidative coupling of methane,OCM)不同分离流程的物耗、能耗、主要设备操作条件,采用Symmetry分别对深冷分离和中冷油吸收分离工艺进行建模计算。结果表明,深冷分离的主要设备在3.6 MPa、-100℃条件下进行操作,中冷油吸收分离的主要设备在2.7 MPa、-40℃条件下进行操作。2种分离方案均获得摩尔分数99.95%聚合级乙烯产品,深冷分离方案的乙烯产品摩尔回收率为98%,综合能耗是668.6 kgoe/t乙烯;中冷油吸收分离方案的乙烯产品摩尔回收率为95%,综合能耗是629.9 kgoe/t乙烯,中冷油吸收分离方案综合能耗达到新建乙烯装置能耗要求最低准入。

To investigate the material consumption,energy consumption,and key equipment operating conditions of different separation processes for ethylene production via oxidative coupling of methane (OCM),Symmetry process simulation software was employed to establish models and conduct calculations for the cryogenic separation process and medium-temperature oil absorption separation process,respectively.The results demonstrate that the core equipment of the cryogenic separation process operates under conditions of 3.6 MPa and -100℃,whereas that of the medium-temperature oil absorption separation process runs at 2.7 MPa and -40℃.Both separation schemes produced polymer-grade ethylene products with a mole fraction of more than 99.95%.The cryogenic separation scheme achieved a molar recovery rate of 98% for ethylene products,with a comprehensive energy consumption of 668.6 kgoe/t C₂H₄.In contrast,the medium-temperature oil absorption separation scheme had a molar recovery rate of 95% for ethylene products and a comprehensive energy consumption of 629.9 kgoe/t C₂H₄,which meets the minimum access standard for the energy consumption requirements of new-built ethylene units.