The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 07, 1995
Filed:
May. 19, 1994
Robert E Williams, Magnolia, AR (US);
William J Cranston, III, Magnolia, AR (US);
Albemarle Corporation, Richmond, VA (US);
Abstract
This invention provides an environmentally acceptable method for recovery of phenolic and brominated phenolic compounds, alcohol solvent, and bromide values from the a reaction medium liquid mixture formed in the production of a tetrabromobisphenol-A predominant product. The process comprises (a) separating the tetrabromobisphenol-A predominant product and alkyl bromide from the reaction medium thereby forming a liquid mixture containing alcohol, phenolic and brominated phenolic compounds, HBr, and water; (b) treating the liquid mixture with a sufficient amount of alkaline or alkaline earth metal hydroxide so as to form a treated aqueous mixture having a pH in the range of from about 9.5 to about 14.0, and containing MBr.sub.n, water, alcohol, and soluble salts of the phenolic and brominated phenolic compounds, wherein M is an alkaline or alkaline earth metal ion, and n is the valence of M; (c) distilling alcohol from the treated aqueous mixture of (b); (d) acidifying the treated aqueous mixture from (c) subsequent to distillation with a sufficient amount of acid to precipitate the phenolic and brominated phenolic compounds therefrom; and (e) separating the precipitated phenolic and brominated phenolic compounds from the acidified aqueous mixture of (d).