Process for preparing bisphenol A

Details Process for preparing bisphenol A Process for preparing bisphenol A

1988-04-21

1989-01-17

Lacey, David L.

Distillation: processes, separatory

Vaporization zone under positive pressure or vacuum

And returning product of distillation step to distillation zone

203 98, 203DIG9, 568724, B01D 310, C07C 3774

Patent

active

047986549

ABSTRACT:
This invention relates to a process for preparing 2,2-bis(4-hydroxyphenyl)propane, e.g. bisphenol A and particularly to a process for preparing high quality bisphenol A with good workability by distilling the intermediate adduct of bisphenol A and phenol.
The adduct of bisphenol A and phenol is fed to a distillation column. Phenol is recovered from the top of the column and bisphenol A is obtained from its bottom. In this distillation process, the adduct of bisphenol A and phenol is added with a part of recycled bottom liquid. Consequently troubles such as plugging of the distillation column are prevented, continuous operation becomes possible for a long period of time and high quality bisphenol A can be steadily obtained.

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