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:
Oct. 18, 1983
Filed:
Nov. 30, 1981
Brent A Dellacoletta, Evansville, IN (US);
John W Verbicky, Scotia, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
A process is provided for making bisphenoxide salts by the flash evaporation of water from an aqueous mixture of a bisphenol and an alkali metal hydroxide. Improved control over the stoichiometry of the bisphenol and the alkali metal hydroxide in the aqueous mixture is achieved by monitoring bisphenol content in the aqueous bisphenoxide salt mixture. An extractive organic solvent for the bisphenol is used with an aliquot of the bisphenoxide salt mixture. The stoichiometric balance in the aqueous bisphenoxide salt mixture is determined by measuring the absorbance value of the bisphenol in the organic solvent phase, and comparing it to a known curve obtained by plotting known bisphenol absorbance values and equivalents of alkali metal hydroxide.