BIS(DIALKYLDIPHOSPHATO)ALKANE COMPOUND, ITS PRODUCTION, EXTRACTANT FOR PALLADIUM EXTRACTINO AND RECOVERY OF PALLADIUM

摘要

PROBLEM TO BE SOLVED: To provide the subject new compound enabling selective back- extraction of Pd in a short time and producible by reacting an alcohol with phosphorus pentasulfide and reacting the resultant dialkyl dithiophosphate with ammonia and then with a dihaloalkane. ;SOLUTION: This new bis(dialkyldithiophosphato)alkane compound is expressed by the formula I ((n) is an integer of 1-6; R is a 1-6C alkyl) [e.g. bis(diethylthiophosphato)methane] and useful as an extractant for palladium extraction enabling the selective back-extraction of palladium in a short time to recover palladium from a used palladium catalyst or a waste electronic material, etc., in high efficiency. The compound can be produced by reacting an alcohol expressed by the formula ROH with phosphorus pentasulfide (P₂S₅) to produce a dialkyl dithiophosphate expressed by the formula II, reacting the ester with ammonia and reacting the resultant ammonium salt of the formula III with a dihaloalkane in an organic solvent.;COPYRIGHT: (C)1997,JPO