公开(公告)号：EP0168438A4

公开(公告)日：1987-10-22

申请号：EP85900562

申请日：1984-12-22

申请人： CHENG SING-WANG ,  CHENG CHEN YEN

发明人： CHENG SING-WANG

IPC分类号： B01D9/02 ,  B01D9/00 ,  B01D9/04

CPC分类号： B01D9/004

摘要： A process of washing a crystal-mother liquor mixture to produce a mass of purified crystals in a purification zone containing two sets of sub-zones, respectively denoted as Type A sub-zones and Type B sub-zones, that are laid sequentially and alternately, wherein the process comprises: i) a step of applying a means of enhancing the transfer of impurities from the retained liquid to the free liquid in each Type A sub-zone, and ii) a step of applying a means of reducing the amount of impurities from the intercrystalline free space in each Type B sub-zone, and iii) a step of transferring the solid phase and the free liquid in the coutercurrent directions.