Continuous production of pure phosphine
Patent 4143121 Issued on March 6, 1979. Estimated Expiration Date: 
July 13, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 13, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References2977192 InventorsApplicationNo. 05/815161 filed on 07/13/1977US Classes:423/299PHOSPHORUS OR COMPOUND THEREOFExaminersPrimary: Vertiz, O. R.Assistant: Heller, Gregory A. Attorney, Agent or FirmInternational ClassesC01B 25/00 (20060101)C01B 25/06 (20060101) Foreign Application Priority Data1976-07-17 DEAbstractPhosphine is continuously produced by reacting yellow phosphorus with an aqueous alkali metal hydroxide 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.Field of SearchPHOSPHORUS OR COMPOUND THEREOF |
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