Back to results
US 6,685,904 B1Granted
Process for making phosphorus halides and oxyhalides
AssigneeOccicdental Chemical Corporation
InventorsHarry E. Buckholtz, Mohamed W. Hisham
Life of this patent
Estimating the term…
Abstract
Disclosed is a process for producing phosphorous trichloride, phosphorous pentachloride, or phosphorous tribromide by reacting phosphine gas with chlorine gas or bromine gas, in a mixture with hydrogen gas. The phosphine is dried and the reaction is performed at a temperature up to about 250° C. The phosphorous trichloride or phosphorous tribromide product can be reacted with oxygen to form phosphorous oxychloride or phosphorous oxybromide, respectively.
Claims20
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 250° 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.
A process for making POX3 comprising
- (A) producing PX3 by reacting a mixture of dry phosphine gas and hydrogen in a molar ratio of phosphine to hydrogen between 0.05 and 0.95, and less than 1 ppm water with X2 gas in a molar ratio of said X2 gas to said phosphine of 3 to about 3.1 at a temperature of about 50 to about 125° C.;
- (B) reacting said PX3 with oxygen in situ without further isolation or purification of said PX3, where X is chlorine, bromine, or a mixture thereof.
A process for making phosphorous trichloride comprising
- (A) hydrolyzing tetraphosphorus with sodium hydroxide to produce a solution and a gaseous mixture of phosphine and hydrogen;
- (B) drying said gaseous mixture of phosphine and hydrogen to less than 1 ppm water;
- and
- (C) reacting said phosphine in said mixture with chlorine gas in an amount stoichiometric up to about 0.1 mole % in excess of stoichiometric at a temperature between about 50 and about 125° C., where there is no significant loss of said chlorine due to the reaction of said chlorine gas with said hydrogen.
1 more element
Dependencies are inferred from the claim text.