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Title: Process for the removal of acid forming gases from exhaust gases

Abstract

Exhaust gases are treated to remove NO or NO[sub x] and SO[sub 2] by contacting the gases with an aqueous emulsion or suspension of yellow phosphorus preferably in a wet scrubber. The pressure is not critical, and ambient pressures are used. Hot water temperatures are best, but economics suggest about 50 C is attractive. The amount of yellow phosphorus used will vary with the composition of the exhaust gas, less than 3% for small concentrations of NO, and 10% or higher for concentrations above say 1000 ppm. Similarly, the pH will vary with the composition being treated, and it is adjusted with a suitable alkali. For mixtures of NO[sub x] and SO[sub 2], alkalis that are used for flue gas desulfurization are preferred. With this process, 100% of the by-products created are usable, and close to 100% of the NO or NO[sub x] and SO[sub 2] can be removed in an economic fashion. 9 figs.

Inventors:
;
Issue Date:
OSTI Identifier:
7309911
Patent Number(s):
5164167 A
Application Number:
PPN: US 7-261229
Assignee:
Univ. of California, Berkeley, CA (United States) PTO; EDB-94-090713
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Resource Relation:
Patent File Date: 24 Oct 1988
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 01 COAL, LIGNITE, AND PEAT; EXHAUST GASES; DENITRIFICATION; DESULFURIZATION; AIR POLLUTION CONTROL; NITRIC OXIDE; NITROGEN OXIDES; SULFUR DIOXIDE; CHALCOGENIDES; CHEMICAL REACTIONS; CONTROL; FLUIDS; GASEOUS WASTES; GASES; NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; POLLUTION CONTROL; SULFUR COMPOUNDS; SULFUR OXIDES; WASTES; 540120* - Environment, Atmospheric- Chemicals Monitoring & Transport- (1990-); 010800 - Coal, Lignite, & Peat- Waste Management

Citation Formats

Chang, S.G., and Liu, D.K. Process for the removal of acid forming gases from exhaust gases. United States: N. p., 1992. Web.
Chang, S.G., & Liu, D.K. Process for the removal of acid forming gases from exhaust gases. United States.
Chang, S.G., and Liu, D.K. Tue . "Process for the removal of acid forming gases from exhaust gases". United States.
@article{osti_7309911,
title = {Process for the removal of acid forming gases from exhaust gases},
author = {Chang, S.G. and Liu, D.K.},
abstractNote = {Exhaust gases are treated to remove NO or NO[sub x] and SO[sub 2] by contacting the gases with an aqueous emulsion or suspension of yellow phosphorus preferably in a wet scrubber. The pressure is not critical, and ambient pressures are used. Hot water temperatures are best, but economics suggest about 50 C is attractive. The amount of yellow phosphorus used will vary with the composition of the exhaust gas, less than 3% for small concentrations of NO, and 10% or higher for concentrations above say 1000 ppm. Similarly, the pH will vary with the composition being treated, and it is adjusted with a suitable alkali. For mixtures of NO[sub x] and SO[sub 2], alkalis that are used for flue gas desulfurization are preferred. With this process, 100% of the by-products created are usable, and close to 100% of the NO or NO[sub x] and SO[sub 2] can be removed in an economic fashion. 9 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {11}
}