Patent ID: 7989666

Claim:
A method for preparing bisphenol A, comprising the following steps: transferring phenol and acetone into a reaction zone charged with condensation catalyst, obtaining a stream containing bisphenol A after reaction; transferring the obtained stream containing bisphenol A into a rectification zone obtaining a product fraction primarily containing bisphenol A and phenol; and transferring the product fraction primarily containing bisphenol A and phenol into a crystallization zone to obtain a bisphenol A product; wherein said rectification zone is a rectification column, and a water-depleted fraction in liquid primarily containing phenol, bisphenol A, and acetone and having a water content that is controlled at a level of not greater than 2% by weight is obtained as a side draw from the rectification column, and wherein said water-depleted fraction is cooled and returned as a cycled stream to the reaction zone.