Patent ID: 6685904
Filing Date: 2004-02-03
Classification: C01B

Abstract:
A process for preparing PXncomprising(A) adding X2 gas to a mixture of dry phosphine and hydrogen in a molar ratio of phosphine to hydrogen between 0.05 and 0.95, where X is chlorine or bromine, n is 3 or 5 when X is chlorine, n is 3 when X is bromine, and the molar ratio of said X2 gas to said phosphine is between 3 and about 3.1 when n is 3 and between 5 and about 5.1 when n is 5; and (B) maintaining the temperature of said mixture at less than about 250Â° C., whereby said X2 gas reacts with said phosphine to produce said PXn and there is no significant loss of X due to the reaction of said X2 gas with said hydrogen.