公开(公告)号：US5245088A

公开(公告)日：1993-09-14

申请号：US846996

申请日：1992-04-07

申请人： Shigeru Fimuro ,  Akira Yamada ,  Kenichi Ohmura

发明人： Shigeru Fimuro ,  Akira Yamada ,  Kenichi Ohmura

IPC分类号： C07C37/84

CPC分类号： C07C37/84

摘要： A process for preparing high-purity bisphenol A by estimating on line slurry concentration of a bisphenol A-phenol adduct in a crystallizer on the basis of a material balance and a heat balance around the crystallizer and thereby maintaining said slurry concentration at a prescribed level to precipitate the crystals of said adduct. The slurry having a constant concentration can be always fed to a slurry separating step, thereby enabling steady operation of the slurry separating step. Thus, the process is useful for enhancing productivity. As a result, extraordinary adhesion of the impurity-containing filtrate to the crystals of the bisphenol A-phenol adduct can be inhibited in the slurry separating step, and hence high-purity bisphenol A can be obtained.