Process and apparatus for treating bulk commodities

Fishing – trapping – and vermin destroying – Vermin destroying – Fumigators

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422 32, 422305, A01M 1300

Patent

active

047561173

ABSTRACT:
In the fumigation of bulk materials such as grain with hydrogen phosphide (phosphine) the gas containing hydrogen phosphide is caused to circulate in a closed loop passing through the bulk material and past the zone of phosphine generation in pulses having a flow rate, duration and pulse intervals so designed that excessive or dangerous accumulations of gas are avoided and that optimum conditions for pest control are attained throughout the system as soon as possible. The intersticial gas of the commodity is changed by the circulation from 5 to 15 times within the period required for 90% of the available phosphine of the metal phosphide to be released. Each pulse has preferably a flow rate and duration sufficient to draw through the bulk commodity a volume of gas at least equal to the volume of the gas space above the bulk commodity and the pulse frequency is at least such that a complete change of intersticial gas in the bulk commodity takes place in less than the time taken for releasing 50% of the available phosphine gas of the composition while the intervals between successive pulses are about from 2 to 100 times as long as the duration of the pulses. Advantageously the flow rate is such as would produce a complete change of intersticial gas in 8 to 80 minutes.

REFERENCES:
patent: 1675123 (1928-06-01), Metzger
patent: 3097916 (1963-07-01), Dawson
patent: 4200657 (1980-04-01), Cook
patent: 4215508 (1980-08-01), Allen
patent: 4223044 (1980-09-01), Se
patent: 4347241 (1982-08-01), Kapp
patent: 4421742 (1983-12-01), Friemel

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