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:
Sep. 06, 1994
Filed:
Mar. 16, 1993
Abbas Kadkhodayan, Collinsville, IL (US);
Ethyl Petroleum Additives, Inc., Richmond, VA (US);
Abstract
This invention relates to an improved process for producing diesters of phosphorous acid. The process comprises (a) reacting phosphorous acid with monohydric alcohol in a petroleum distillate solvent while maintaining a reaction mass temperature within the range of from about 130.degree. to about 138.degree. C., and (b) refluxing the reaction mass during the reaction, wherein the phosphorous acid contains about 20 up to about 35 wt. % water, the molar ratio of alcohol to phosphorous acid used is within the range of from about 2.0:1 to about 4.0:1, and water is removed from the reaction mass essentially as it is formed during steps (b) and (c).