Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1995-01-04
1995-12-12
Lone, Werren B.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568779, C07C 39367
Patent
active
054751535
ABSTRACT:
A process for the preparation of 4,4'-isopropylidene bis(2,6-dibromophenol), also known as tetrabrombisphenol A, that dramatically reduces the formation of alkyl bromide by-products. Bisphenol A is brominated with a C.sub.3 to C.sub.5 n-alcohol in a water mixture to suppress the formation of alkyl bromides. The bisphenol A is brominated between 15.degree. C. and 25.degree. C. and then heated at a 55.degree. C. to 70.degree. C. to insure bromination is complete. The tetrabrombisphenol A is then filtered from the reaction mixture and dried. Tetrabromobisphenol A produced from this process typically has a melting point of 180.degree. C. or higher, and is typically greater than 98% pure. Hydrogen peroxide is optionally combined with the reactants to reduce the amount of added bromine necessary for the bromination of the tetrabromobisphenol A.
REFERENCES:
patent: 3029291 (1962-04-01), Dietzler
patent: 3234289 (1966-02-01), Hennis
patent: 3929907 (1975-12-01), Janzon et al.
patent: 4180684 (1979-12-01), Kleinschmit et al.
patent: 4701568 (1987-10-01), McKinnie et al.
patent: 5138103 (1992-08-01), Eguchi et al.
Great Lakes Chemical Corp.
Lone Werren B.
LandOfFree
Process to produce tetrabromobisphenol with the reduced formatio does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process to produce tetrabromobisphenol with the reduced formatio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process to produce tetrabromobisphenol with the reduced formatio will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1361131