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US 12,022,834 B2Granted
Phosphine for fumigation, method for producing same, and fumigation method
AssigneeNippon Chemical Industrial Co., Ltd.
InventorHiroya Kawase
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AssigneeNippon Chemical Industrial Co., Ltd.
InventorHiroya Kawase
Estimating the term…
The present invention addresses the problem of providing phosphine for fumigation, by which clogging of a pipe of a fumigation gas feed device due to impurities is effectively suppressed and which has low spontaneous ignitability. The present invention also addresses the problem of providing a phosphine fumigation method in which clogging of a pipe of a fumigation gas feed device and a possibility of spontaneous ignition are reduced and which is safe. The phosphine for fumigation of the present invention has a P4 content of 10 mass ppm or less and a water content of 10 mass ppm or less. The fumigation method of the present invention includes fumigating a material to be fumigated, using phosphine having a P4 content of 10 mass ppm or less and having a water content of 10 mass ppm or less.
Phosphine for fumigation, having a P4 content of 10 mass ppm or less and having a water content of 10 mass ppm or less,
A method for producing phosphine for fumigation having a P4 content of 10 mass ppm or less and having a water content of 10 mass ppm or less, the method comprising a purification step of removing P4 in phosphine by an activated carbon and then removing water by silica gel or zeolite.
Dependencies are inferred from the claim text.