Method for preparing bisphenol A

Details Method for preparing bisphenol A Method for preparing bisphenol A

2011-08-02

2011-08-02

Parsa, Jafar (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C568S722000, C568S727000, C568S749000

Reexamination Certificate

active

07989666

ABSTRACT:
The present invention discloses 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 a water-depleted fraction primarily containing phenol, bisphenol A and acetone is obtained from the rectification zone, and said water-depleted fraction is cooled and returned as a cycled stream to the reaction zone. Through cycling the water-depleted fraction to the reaction zone, the water content within the reaction zone can be reduced, the catalytic activity can be maintained and the reaction temperature rise can be controlled, thus the conversion of acetone and the selectivity of reaction can be improved accordingly.

REFERENCES:
patent: 2486342 (1949-10-01), Taylor et al.
patent: 4308404 (1981-12-01), Kwantes et al.
patent: 5087767 (1992-02-01), Okamoto et al.
patent: 5648561 (1997-07-01), Tan et al.
patent: 6277945 (2001-08-01), Hachiya et al.
patent: 706434 (1965-03-01), None
patent: 1118155 (1996-03-01), None
patent: 0812815 (1998-12-01), None
patent: 1006143 (2000-06-01), None
patent: 1346973 (2003-09-01), None
patent: 1578952 (1978-05-01), None
patent: 41-4454 (1961-08-01), None
patent: 54-019951 (1979-02-01), None
patent: 54-19952 (1979-02-01), None
patent: 10-59888 (1998-03-01), None
patent: 2000-159925 (2000-06-01), None
patent: 2002-69023 (2002-03-01), None
patent: 2002-193862 (2002-10-01), None
patent: 2003-80002 (2003-03-01), None
Japanese Office Action of Feb. 14, 2011 and English Translation.

Affiliated with

Also associated with

Rating

Method for preparing bisphenol A does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for preparing bisphenol A, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for preparing bisphenol A will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2743932