China Petroleum Chemical Corporation

Shanghai Research Institute of Petrochemical Technology, Sinopec

Yanzi Guo

Jian Xiao

Dejin Kong

Luping Zhong

Yongyan Lu

A process for separating ethylene glycol and 1,2-butanediol. A material flow containing ethylene glycol and 1,2-butanediol gets into the lower-middle part of the azeotropic rectification column Cafter the light components are removed by the separating columns Cand C, wherein the ethylene glycol and the azeotropic agent added from the top of the column form azeotrope which is distilled out from the top of the column and gets into the phase separator Dafter being condensed, the upper phase enriched with azeotropic agent after the phase was separated returns to the top of the column to continue to participate in azeotropy, and the lower phase enriched with ethylene glycol gets into the fourth separating column Cto be refined to obtain the ethylene glycol product.

Process for separating ethylene glycol and 1,2-butanediol

Provided is a process for crystallization separating p-xylene, comprising: a) feeding a mixed xylenes stream comprising greater than or equal to 60% by weight, of p-xylene, such as 60% to 98% by weight of p-xylene, to a crystallization unit to perform cooling crystallization, to obtain a slurry comprising p-xylene crystals; and b) feeding the slurry to a filtration and purification unit, to obtain a mother liquor, washings, and p-xylene, wherein the filtration and purification unit uses a simulated moving bed or a combination of multiple moving beds.

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Shanghai, China

Yanzi Guo