Process for regenerating absorbing solution used for exhaust gas

Details Process for regenerating absorbing solution used for exhaust gas Process for regenerating absorbing solution used for exhaust gas

1975-12-29

1977-03-22

Spear, Jr., Frank A.

Gas separation

Means within gas stream for conducting concentrate to collector

55 48, 55 73, 55 89, B01D 5314

Patent

active

040134300

ABSTRACT:
In the process wherein industrial exhaust gases containing nitrogen oxides and SO.sub.2 are treated with an absorbing solution containing an iron chelate complex and a sulfite to remove nitrogen oxides and SO.sub.2, the absorptivity of the solution is reduced sometimes on account of dithionate formed during the treatment. The absorptivity-reduced absorbing solution is regenerated by heat-treating the solution at a pH of 3.0 or lower and a temperature of 80.degree. C or higher whereby the dithionate is decomposed.

REFERENCES:
patent: 3503185 (1970-03-01), Delzenne et al.
patent: 3556722 (1971-01-01), Owaki
patent: 3644087 (1972-02-01), Urban
patent: 3653812 (1972-04-01), Schneider et al.
patent: 3923954 (1975-12-01), Petrey, Jr. et al.
patent: 3933993 (1976-01-01), Salemme

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