Tetrabromobisphenol-A process

Details Tetrabromobisphenol-A process Tetrabromobisphenol-A process

1989-12-22

1991-10-22

Lone, Werren B.

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

Organic compounds

Sulfur containing

568723, 568779, C07C 39367, C07C 3762

Patent

active

050597221

ABSTRACT:
Tetrabromobisphenol-A is made in high purity by adding a methanol-bromine solution to a methanol-bisphenol-A solution with vigorous agitation. Use of the bromine-methanol solution reduces the amount of by-products compared to the use of liquid bromine feed to a methanol-bisphenol-A solution. The process is readily adapted to large scale equipment by circulating the reaction mixture from the reaction vessel through an external closed loop which includes an impingement mixer. The bromine-methanol feed is pumped at the proper rate and ratio into the impingement mixture whereby it impinges with the circulating reaction mixture. The resultant bromination mixture is then returned to the reaction vessel.

REFERENCES:
patent: 3182088 (1965-05-01), Hennie
patent: 3234289 (1966-02-01), Hennis
patent: 3868423 (1975-02-01), Montanari et al.
patent: 4013728 (1977-03-01), Mitchell et al.
patent: 4701568 (1987-10-01), McKinnee et al.
patent: 4783556 (1988-11-01), Mitchell
patent: 4909997 (1990-02-01), Mitchell et al.

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