Patent ID: 6774268
Filing Date: 2004-08-10
Classification: C07C

Abstract:
A process of preparing an oxygen-free mixture comprising,(a) separating an adduct of bisphenol A and phenol from a feed stream by means of crystallization and filtration, and concurrently forming a mother liquor substream; (b) dewatering said mother liquor substream; (c) rendering said mother liquor substream free of oxygen, thereby forming said mixture; and (d) placing said mixture into a container, wherein said mixture comprises,35 to 75 wt. % of p,p-bisphenol A, 5 to 25 wt. % of o,p-bisphenol A, and 20 to 50 wt. % of secondary products which are produced during the preparation of bisphenol A, wherein the sum of the percentages by weight of p,p-bisphenol A and o,p-bisphenol A is 50 to 80 wt. % and wherein the sum of the percentages by weight of p,p-bisphenol A and o,p-bisphenol A and the secondary products totals 100 wt. %.