METHOD, COMPOSITION AND DEVICE FOR PRODUCING A FUMIGANT GAS, FUMIGATION METHODS AND CONTROL SYSTEM

The present invention relates to a method for producing a fumigant gas that consists of a mixture of phosphine and carbonic gas. The method involves adding to the starting composition of reactants a binder, an acid as well as a substance capable of generating carbon dioxide during a chemical endothermic process. The method comprises mixing a metal phosphide, the above-mentioned substance and the binder, and reacting the mixture thus obtained with a mixture of acid and water in order to produce simultaneously the phosphine and the carbon dioxide. The heat released is compensated by the chemical endothermic process during the production of carbon dioxide from the substance introduced into the mixture. The device for realising this method comprises a reactor that consists of at least one unit comprising two communicating chambers. One of the chambers is intended for accommodating the mixture comprising the metal phosphide, the above-mentioned substance and the binder, while the other chamber is intended for accommodating the mixture of acid and water. An outlet opening for the fumigant gas is further provided in the chamber containing the acid and water mixture. The device may include a plurality of units and can be a portable one. This invention also relates to different variants of fumigation methods as well as to a system for controlling the gas concentration according to the types of objects to be treated and to the convection currents therein. Cette invention concerne un procédé permettant de produire un gaz fumigène qui consiste en un mélange de phosphine et de gaz carbonique. Ce procédé consiste à ajouter, à la composition des réactifs de base, un liant, un acide ainsi qu'une substance qui dégage du gaz carbonique lors d'un processus chimique endothermique. On mélange un phosphure de métal, le liant et ladite substance dégageant du gaz carbonique, après quoi le mélange obtenu est mis en interaction avec un mélange d'acide et d'eau de manière à produire simultanément de la phosphine et du gaz carbonique. La chaleur émise est compensée par le déroulement du processus chimique endothermique lors de la production de gaz carbonique à partir de la substance introduite dans le mélange. Le dispositif de mise en oeuvre de ce procédé comprend un réacteur qui consiste en au moins une unité comprenant deux chambres communicantes. L'une de ces chambres renferme le mélange comprenant le phosphure de métal, ladite substance dégageant du gaz carbonique et le liant, ta