公开(公告)号：US20240002243A1

公开(公告)日：2024-01-04

申请号：US18039469

申请日：2021-10-27

Applicant: PETROCHINA COMPANY LIMITED

Inventor： Tong LIU ,  Yuanyuan CAO ,  Yulong WANG ,  Libo WANG ,  Xianming XU ,  Hongping LI ,  Enhao SUN ,  Xiuhui WANG ,  Wei SUN ,  Han GAO ,  Hongling CHU ,  Yongjun ZHANG ,  Yonggang JI ,  Kecun MA ,  Yan JIANG ,  Qian CHEN ,  Hongliang HUO ,  Qi YU

IPC: C01B35/06 ,  B01D3/06 ,  B01D53/22 ,  B01D71/34 ,  B01D71/36

CPC classification number: C01B35/061 ,  B01D3/06 ,  B01D53/228 ,  B01D71/34 ,  B01D71/36 ,  C01B2210/0012 ,  B01D2311/10 ,  B01D2311/14

Abstract: The present invention provides a method for separation and recovery of boron trifluoride and complexes thereof in an olefin polymerization reaction. The method for separation and recovery of boron trifluoride and complexes thereof in an olefin polymerization reaction, comprising: 1) subjecting a mixture obtained after an olefin polymerization reaction to flash distillation separation to separate part of gaseous boron trifluoride; 2) subjecting the liquid phase obtained from the flash distillation separation to membrane separation to obtain complexes of boron trifluoride and a crude product of the olefin polymerization reaction; and 3) subjecting the crude product of the olefin polymerization reaction obtained in step 2) to gas stripping separation to separate the remaining gaseous boron trifluoride, so as to obtain a pure product of the olefin polymerization reaction The present invention designs a matching process based on the polymorphic characteristics of boron trifluoride and complexes thereof to achieve efficient separation of boron trifluoride and complexes thereof from polymerization intermediates.