Method for separating 1,4-diethylbenzene and 1,3-diethylbenzene from diethylbenzene isomer mixture

摘要

The invention diethylbenzene isomer mixture to a method of separating 1,4-diethylbenzene, and 1,3-diethylbenzene from, more specifically, diethylbenzene isomer mixture, or diethylbenzene isomer mixture through a continuous simulated moving bed adsorption process from a raw material mixture of the by-products of ethylbenzene production process including a method for separating 1,4-diethylbenzene, and 1,3-diethylbenzene. Separation method according to the invention, a 0.5 to 10% by weight of potassium and 15 to 30% by weight of the cation is barium-substituted type X zeolite molecular sieve as adsorbent and a mixture of p-xylene mixed with 30 to 80% by weight is carried out through a continuous simulated moving bed adsorptive separation process to a zero-xylene desorption. Can be obtained for 1,4-diethylbenzene in 99% purity by the method according to the present invention in a yield of 95%, with over 85% purity can be obtained 1,3-diethyl benzene, the 1,3 -diethylbenzene can produce more than 95% pure via distillation continuously. The present invention can significantly reduce the utility costs as compared with the step of desorbent use the p-xylene alone can prevent the productivity and purity by reducing the developing process in the dead space and also to prevent freezing in winter phenomenon. ; Simulated moving bed adsorptive separation, diethylbenzene isomers, mixed xylene, zeolite, molecular sieve