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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.