Method of preparing monothiophosphoric acid by sulfurizing a...

C - Chemistry – Metallurgy – 07 – F

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44/27, 260/460,

C07F 9/17 (2006.01) C10L 1/26 (2006.01) C10M 137/10 (2006.01) C10M 159/12 (2006.01)

Patent

CA 2039724

A method of preparing an oil-soluble composition is disclosed. The method comprises preparing a dihydrocarbyl monothiophosphoric acid characterized by formula (I), wherein R1 and R2 are each independently hydrocarbyl groups of from 1 to about 30 carbon atoms and X is oxygen or sulfur, with the proviso that one X is sulfur comprising reacting (A) a phosphite ester of structure (11), with (B) a sulfur source, in the presence of (C) a catalytic amount of an amide of the structure R3CONR4R5 wherein R3, R4 and R5 are each independently hydrogen or a hydrocarbyl group containing from 1 to about 30 carbon atoms or an ethoxylated amide of structure (III), wherein the sum of x and y is from 1 to about 50; and isolating the reaction product obtained.

Un procédé de préparation d'une composition soluble dans l'huile est décrit. Le procédé consiste à préparer un acide monothiophosphorique de dihydrocarbyle, caractérisé par la formule (I), dans laquelle R1 et R2 représentent chacun indépendamment des groupes hydrocarbyles contenant 1 à environ 30 atomes de carbone, et X représente de l'oxygène ou du soufre, à condition qu'un X représente du soufre, à faire réagir (A) un ester de phosphite de la structure (II), avec (B) d'une source de soufre, en présence de (C), une quantité catalytique d'un amide de la structure R3CONR4R5, dans laquelle R3, R4 et R5 représentent chacun indépendamment de l'hydrogène ou un groupe hydrocarbyle contenant 1 à environ 30 atomes de carbone ou un amide éthoxylé de la structure (III) dans laquelle la somme de x et de y est comprise entre 1 et environ 50; et à isoler le produit de la réaction obtenu.

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