Production of alkyl phosphites
AssigneeEthyl Petroleum Additives, Inc.
InventorAbbas Kadkhodayan
Life of this patent
Estimating the term…
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).
Claims20
A method for producing diesters of phosphorous acid comprising:
- a) charging phosphorous acid solution and solvent to a reaction vessel, wherein the phosphorous acid contains about 20 up to about 35 wt. % water;
- b) feeding from about 2.0 to about 4.0 moles of monohydric alcohol per mole of phosphorous acid to the reaction vessel containing phosphorous acid solution and solvent while maintaining a reaction mass temperature within the range of from about 130.degree. to about 138.degree. C. and while removing water from the reaction mass essentially as it is formed;
- and
- c) subsequently, separating alcohol and solvent from the dihydrocarbyl phosphite formed in step (b).
A process for producing dialkyl esters of phosphorous acid, comprising (a) charging phosphorous acid solution and a petroleum distillate solvent to a reaction vessel, (b) reacting the phosphorous acid with monohydric alcohol in the solvent while maintaining a reaction mass temperature within the range of from about 130.degree. to about 138.degree. C., and (c) 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).
Dependencies are inferred from the claim text.