Process for removing nitrogen oxides and sulfur dioxide from eff

Details Process for removing nitrogen oxides and sulfur dioxide from eff Process for removing nitrogen oxides and sulfur dioxide from eff

1974-02-28

1977-01-25

Thomas, Earl C.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

2041571R, 423235, 423242, B01J 100

Patent

active

040049957

ABSTRACT:
Removal of gaseous pollutants such as nitrogen oxides and sulfur dioxide from effluent gases can be carried out advantageously from an industrial viewpoint by effecting irradiation of said gases under specifically selected conditions. High dose rate electron beam irradiation at a dose rate in the region of 10.sup.5 rad/sec or higher is, unexpectedly, remarkably effective and efficient for said purpose. Irradiation under increased pressure is also preferable. Wash of gases after irradiation or effecting irradiation in the presence of water vapor is effective especially for the removal of nitrogen oxides. Further, by carrying out the process in two-steps in which nitrogen oxides are removed from such gases almost completely by irradiation with the minimum dose of electron beams before sulfur dioxide is removed from the thus treated gases by conventional desulfurization means, the process can be carried out very economically. Thus, it has become industrially feasible to treat the effluent gases with irradiation, for the removal of nitrogen oxides and sulfur dioxide before releasing them into the atmosphere.

REFERENCES:
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patent: 3198721 (1965-08-01), Rich
patent: 3389971 (1968-06-01), Alliger
patent: 3565777 (1971-02-01), Lauer
patent: 3653185 (1972-04-01), Scott et al.
patent: 3674435 (1972-07-01), Luik, Jr. et al.
patent: 3715187 (1973-02-01), Bartholomew et al.
patent: 3754074 (1973-08-01), Grantham
patent: 3790660 (1974-02-01), Earl et al.
patent: 3869362 (1975-03-01), Machi et al.

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