Process for the crystallization separation of p-xylene
AssigneesChina Petroleum & Chemical Corporation, Shanghai Research Institute of Petrochemical Technology, Sinopec
InventorsLuping Zhong, Jian Xiao, Yongyan Lu, Yanzi Guo, Dejin Kong
Life of this patent
Estimating the term…
Abstract
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.
Claims14
A process for crystallization separation of p-xylene, comprising:
- a) feeding a mixed xylenes stream comprising greater than or equal to 60% 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 crystals,
- wherein the filtration and purification unit uses a simulated moving bed or a combination of multiple moving beds.
Dependencies are inferred from the claim text.