Abstract: The refinery industry is an energy⁃intensive industry. So the efficient recycle and utilization of light hydrocarbon gases will solve the difficulties of energy conservation and environmental protection.The adsorption and the adsorption⁃hydration method were applied to separate C2 from the simulated refinery dry mixture gas of M1(C2H6(11.55%)+C2H4(12.46%)+CH4(29.15%)+N2(27.02%)+H2(19.82%)).The collected mixture gas M2 was secondary separated by ZIF⁃8. The result showed that molar fraction of C2 was decreased to 9.90% after primary separation process using adsorption⁃hydration method.Because of the higher concentration of C2,the values of y_(C_2 ) and MC of product using the adsorption⁃hydration method were better than the adsorption method under the same initial pressure. Because the molar fraction of C2 in M2 was low, the hydrate was difficult to be formed in the system of M2, and the adsorption method with dry ZIF⁃8 was proved to be adaptive to separate the gas mixture of M2 to avoid the negative effects of water in the system of wet ZIF⁃8. Through the two⁃step separation process, the molar fraction of C2 in M1 was decreased from 24.01% to 2.90%.

Key words: C2H6+C2H4, Refinery dry gas, Two stages separation, ZIF?8, Adsorption?hydration hybrid method

摘要： 炼油工业作为一个能量密集型工业，对炼厂干气中轻烃组分气体进行有效回收且利用，将同时解决其一直面临的节能及环保两大难题。采用吸附法以及吸附⁃水合法分离含有C2（即C2H6+C2H4）的模拟炼厂干气M1:C2H6(11.55%)+C2H4(12.46%)+CH4(29.15%)+N2(27.02%)+H2(19.82%)，且将分离混合气M2作为二级分离的原料气，完成ZIF⁃8材料对混合气M1的两级分离过程。结果表明，一级分离采用吸附⁃水合分离法使C2组成摩尔分数降低至9.90%；由于原料气M1中C2摩尔分数较高，较吸附分离法，吸附⁃水合法在平衡气相中y_(C_2 )降低幅度和吸附量MC较大；由于C2组分摩尔分数较低，二级分离过程不易形成水合物，因此采用吸附分离法，规避湿ZIF⁃8水分对分离及吸附量造成的负面影响。经过二次分离过程，可以将原料气M1中C2摩尔分数由24.01%降低至2.90%，有效回收了炼厂干气中C2组分。