| 摘要 |
A metal phosphide composition is disclosed for generating a mixture of phosp hine and diluent gas(es), presented ready for use in a hydrolysis process or apparatu s in the form of a free-flowing particulate metal phosphide material composed of loose partic les of said metal phosphide essentially free of metal phosphide dust, essentially free o f hydrolysis retarding agents and essentially free of hydrophobic substances in the form of coatings or hydrophobising additives. In use the hydrolysable metal phosphide, preferabl y magnesium phosphide, is released directly into liquid water under an atmosphere of gas inert to phosphine. The generated mixture of phosphine and inert carrier gas, e.g. CO 2, can be used as such or is diluted into a gas mixing chamber with air to a concentra tion below the ignitability limit before being used in fumigation. The composition is manuf actured by reacting a finely divided metal, selected from the group consisting of alumi nium, calcium and magnesium with yellow phosphorus in an inert gas atmosphere and in the p resence of a catalyst. Throughout the reaction batch and throughout the process, once rea cting has commenced, a temperature is maintained within the range of 350.degree.C to 5 50.degree.C. The metal phosphide is withdrawn as a particulate free-flowing material and is package d ready for use in phosphine generation in such free-flowing condition, essentially free of dust, essentially free of hydrolysis retarding agents and essentially free of hyrophobising su bstance in the form of coating or hydrophobising additives, in a gastight container.</SDOAB > |
