Exhaust gas treating method

Details Exhaust gas treating method Exhaust gas treating method

1989-12-04

1991-07-23

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

423242, B01D 5314

Patent

active

050340280

ABSTRACT:
A method of treating an exhaust gas containing SO.sub.2 and HF which is characterized by using an absorbing liquid containing CaCO.sub.3 and Ca(OH).sub.2 as absorbents to be fed to an absorption tower for the exhaust gas, circulating the absorbing liquid from a second slurry tank to the absorption tower, from the absorption tower to a first slurry tank, and from the first flurry tank to the second slurry tank, introducing Ca(OH).sub.2 into the second slurry tank to keep the pH value of the absorbing liquid in the second slurry tank in the range of 5.5-7.0, and blowing air into the absorbing liquid in the first slurry tank.

REFERENCES:
patent: Re29813 (1978-10-01), Yamamichi et al.
patent: 4293521 (1981-10-01), Isahaya et al.
patent: 4297332 (1981-10-01), Tatani et al.
patent: 4792440 (1988-12-01), Nielsen et al.
patent: 4836991 (1989-06-01), Ishiguro et al.
patent: 4853195 (1989-08-01), Lehto
patent: 4900524 (1990-02-01), Fullemann
patent: 4911901 (1990-03-01), Ogawa et al.

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