Gas fumigation method and system
AssigneeCytec Canada Inc.
InventorsDennis Smithyman, Carl W. Schmidt, Sloane R. Six
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Abstract
A method and system are disclosed for fumigating at least one region with a nonflammable gaseous mixture including phosphine. A sensor senses the concentration of phosphine for atmosphere of the region and a flow controller controls flow to the region in response to the sensed concentration. A recycling passage removes a portion of the atmosphere from the region and returns the atmosphere to create a recycle flow through the region. In addition, a gas mixing system is provided to supply the non-flammable mixture by mixing phosphine from a phosphine source and an inert substance from an inert substance source.
Claims18
A system for gas fumigating at least one region, comprising:
- a phosphine source;
- an inert substance source;
- a mixer fluidly coupled to the phosphine source and the inert substance source to form a gaseous mixture including phosphine flowing from the phosphine source and inert substance flowing from the inert substance source, the gaseous mixture passing from the mixer to the region during gas fumigation;
- and
- a flow controller controlling at least one of flow of the phosphine from the phosphine source to the mixer and flow of the inert substance from the inert substance source to the mixer so that the gaseous mixture is non-flammable in air.
Dependencies are inferred from the claim text.