China Petroleum Chemical Corporation

Shanghai Research Institute of Petrochemical Technology, Sinopec

Luping Zhong

Dejin Kong

Jian Xiao

Weisheng Yang

Hongli Guo

Yanzi Guo

Yongyan Lu

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.

Process for the crystallization separation of P-xylene

A process of making p-xylcne comprising processing a mixed feedstock containing benzene, toluene, Caromatic hydrocarbons, Cand higher aromatic hydrocarbons, and non-aromatic hydrocarbons through a series of operations and various units, including a Cand higher aromatic hydrocarbon dealkylation unit, a toluene selective disproportionate unit, an adsorption separation unit, an isomerization unit, and a crystallization separation unit.

Integrated process for the production of P-xylene

Growing community of inventors

Shanghai, China

Luping Zhong