METHOD FOR PREPARING O,O-DIALKYLDITHIOPHOSPHATES Russian patent published in 2005 - IPC

Abstract RU 2245339 C2

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to the improved method for preparing O,O-dialkyldithiophosphates that are used broadly as flotation agents in concentration of nonferrous, rare and precious metal ores. Invention describes a method for preparing O,O-dialkyldithiophosphates involving preparing O,O-dialkyldithiophosphoric acid by interaction of phosphorus pentasulfide with aliphatic alcohol in solvent medium followed by treatment with alkaline agent. O,O-dialkyldithiophosphoric acid is used as a solvent in the mass ratio of phosphorus pentasulfide and O,O-dialkyldithiophosphoric acid = 1:0.2, not less. Invention provides simplifying process, reducing waste in manufacture due to exclusion from technological process the additional using substances as a solvent not taking part in the main reactions, and enhanced yield of the end product.

EFFECT: improved preparing method.

2 cl, 1 tbl, 11 ex

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RU 2 245 339 C2

Authors

Savran V.I.

Andronnikov V.V.

Dates

2005-01-27—Published

2002-06-24—Filed