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US 5,847,232 AGranted
Process for the preparation of tetrabromobisphenol-A
AssigneeAlbemarle Corporation
InventorBonnie G. McKinnie
Life of this patent
Estimating the term…
Abstract
This invention relates to a process for the production of tetrabromobisphenol-A, which process features: a water and water miscible solvent reaction medium; a relatively high reaction temperature; and the presence, in the reaction medium, of unreacted Br.sub.2 during the feed of bisphenol-A to the reactor.
Claims30
A process for the production of tetrabromobisphenol-A, which process comprises:
- a. feeding, to a reactor, a solution comprised of bisphenol-A, water and a water miscible solvent to at least partially form a reaction mass having a liquid phase containing from above about 15 to about 65 wt % water, the wt % being based upon the amount of water and water miscible solvent in the liquid phase;
- b. substantially throughout the feed in (a), providing for the presence of from about 100 to about 10,000 ppm unreacted Br.sub.2 in the reaction mass to yield, substantially throughout the feed in (a), a precipitate containing at least about 97.5 wt % tetrabromobisphenol-A;
- and
- c. substantially throughout the feed in (a), having a reaction mass temperature which is within the range of from about 30.degree. to about 100.degree. C.
1 more element
A process for the production of tetrabromobisphenol-A, which process comprises:
- a. providing a reaction mass liquid phase having (i) a presence of from about 100 to about 10,000 ppm unreacted Br.sub.2, (ii) from about 15 to 65 wt % water and (iii) a water miscible solvent for bisphenol-A, the wt % being based on the amount of water and water miscible solvent in the liquid phase;
- b. feeding, to the reaction mass, a solution comprised of bisphenol-A, water and a water miscible solvent to contemporaneously form a precipitate during substantially all of the feeding period of the solution, which precipitate contains at least about 97.5 wt % tetrabromobisphenol-A;
- c. during the solution feeding period in (b), adding Br.sub.2 to the reaction mass to maintain, during substantially all of the solution feeding period, the presence of from about 100 to about 10,000 ppm unreacted Br.sub.2 in the liquid phase of the reaction mass;
- and
- d. during substantially all of the solution feeding period, maintaining the reaction mass temperature within the range of from about 30.degree. to about 100.degree. C.
2 more elements
Dependencies are inferred from the claim text.