Continuous production of pure phosphine

Details Continuous production of pure phosphine Continuous production of pure phosphine

C - Chemistry, Metallurgy

01

B

23/80

C01B 25/06 (2006.01)

Patent

CA 1083777

CONTINUOUS PRODUCTION OF PURE PHOSPHINE ABSTRACT OF THE DISCLOSURE: Phosphine is continuously produced by reacting yellow phosphorus with an aqueous alkali metal hy- droxide solution in the presence of an alcohol, with the exclusion of oxygen, at 44 to 90°C. To this end, the reaction is effected in two separate reaction stages. In the first reaction stage, the alkali metal hydroxide solution and phosphorus are reacted with agitation in a molar ratio of 0.7:1 to 0.9:1 and the resulting gaseous phosphine is collected. Resulting liquid phase material containing unreacted phosphorus is delivered to the second reaction stage in which the unreacted phosphorus is reacted with further aqueous alkali metal hydroxide solution. The resulting gaseous reaction products are collected separately from the gaseous phosphine collected in the first reaction stage.

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