Method of treating waste gas by irradiation with electron beam

Details Method of treating waste gas by irradiation with electron beam Method of treating waste gas by irradiation with electron beam

1990-06-04

1991-08-20

Heiler, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423239, 2041573, 20415746, 20415749, 2041582, C01B 2100, B01J 800, B01D 5300

Patent

active

050412710

ABSTRACT:
A waste gas containing sulfur oxides (SO.sub.x) and/or nitrogen oxides (NO.sub.x) is purified by leading the waste gas to a radiation irradiation zone, adding ammonia (NH.sub.3) to the waste gas before, during or after the irradiation, collecting the resulting by-product (ammonium sulfate and/or ammonium nitrate) by means of a dust collector, and releasing the purified waste gas into the atmosphere. The amount of NH.sub.3 to be added is selected so as to be smaller than an amount calculated from target desulfurization and denitrification efficiencies so that it is possible to reduce the leakage of ammonia despite variations in the composition of the waste gas. Further, an alkaline substance exclusive of ammonia is added to the waste gas either at a position between the electrostatic precipitator and the bag filter or at the upstream side of a reactor outlet or both or within a dust collector or at the upstream side thereof so that the pH of the collected by-product is adjusted to 6 or more, preferably 7 or more, thereby suppressing the adverse effects of sulfamic acid impurities.

REFERENCES:
patent: 3981815 (1976-09-01), Taniguchi et al.
patent: 3997415 (1976-12-01), Machi et al.
patent: 4097349 (1978-06-01), Zenty
patent: 4294674 (1981-10-01), Aoki et al.
patent: 4323759 (1982-04-01), Aoki et al.
patent: 4525142 (1985-06-01), Gleason et al.
patent: 4585631 (1986-04-01), Pfeiffer
Chemical Engineering Progress, (1985), vol. 81, pp. 33-38, "High Efficiency NO.sub.x and SO.sub.x Removal by Electron Beam", Gleason et al.

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