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:
Apr. 05, 1988
Filed:
Feb. 06, 1987
R Anthony Nunan, Yonkers, NY (US);
John Tomko, Dobbs Ferry, NY (US);
Edward D Weil, Hastings-on-Hudson, NY (US);
George C Ciomo, Hastings-on-Hudson, NY (US);
Stauffer Chemical Company, Westport, CT (US);
Abstract
The reaction residue containing diaryl alkylphosphonate resulting from the reaction of triaryl phosphite and alcohol in the presence of a rearrangement catalyst is treated by optionally, and preferably, stripping phenol by-product therefrom, optionally, and then treating the residue with aqueous dilute acid to convert unreacted triaryl phosphite reagent to diaryl phosphite and remove it as an aqueous layer, and then treating the remaining residue with an aqueous base to yield a water phase containing the unwanted diarylphosphite by-product and an organic phase containing the desired diaryl alkylphosphonate, with subsequent removal of the water phase, prior to subsequent distillation of the remaining organic phase residue to remove purified diaryl alkylphosphonate therefrom.