Process for removing nitrogen oxides and sulfur dioxide from effluent gases

Patent · Tue Jan 25 04:00:00 EST 1977

OSTI ID:7287322

Machi, S; Kawamura, K; Aoki, S; Kawakami, W; Hashimoto, S

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 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.

• Assignee: Ebara Manufacturing Co., Ltd.
• Patent Number(s): US 4004995
• OSTI ID: 7287322
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
424000* -- Engineering-- Pollution Control Equipment-- (1980-1989)
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
AIR POLLUTION CONTROL
BEAMS
CHALCOGENIDES
ELECTRON BEAMS
FLUIDS
GASEOUS WASTES
GASES
INDUSTRIAL WASTES
IRRADIATION
LEPTON BEAMS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
POLLUTION
POLLUTION CONTROL
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
VAPORS
WASTES
WATER VAPOR