Patent ID: 7556785
Filing Date: 2009-07-07
Classification: A01M,A23B,A61L,C01B,Y10T

Abstract:
1. A method for generating a fumigant phosphine gas comprising: a) providing a reaction pot; b) providing a pre-determined quantity of granular metal phosphide into the reaction pot; c) providing a predetermined quantity of water to the granular metal phosphide in the reaction pot to form a reaction mixture of granular metal phosphide and water; d) agitating the reaction mixture using a supply of air at a turbulating pressure of 0.5 to 2 kg/cm e) generating a predetermined quantity of phosphine gas from 56 g to 10,000 g in less than two hours by agitating the reaction mixture, wherein the reaction temperature does not exceed 55° C.; and f) diluting the phosphine gas by supplying dilution air to the reaction pot thereby generating a fumigant phosphine gas, said dilution air is supplied tangentially to the reaction pot thereby producing a fumigant phosphine gas containing 100 to 5000 ppm phosphine gas.