Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1975-03-12
1977-01-11
Thomas, Earl C.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
423245, 21 55, B01D 5334
Patent
active
040027228
ABSTRACT:
Vent gas containing disagreeable odor components consisting mainly of phenolic substances evolving from foundries using shell molding sand containing phenol resin as a binder is efficiently wet-treated by scrubbing the vent gas with an aqueous absorbent solution, to which a ferrous salt and hydrogen peroxide are added so that a ferrous ion concentration may be at least one-seventh of a hydrogen peroxide concentration, thereby making an oxidation-reduction potential of the aqueous absorbent solution have at least a value of (540 - 60 .times. PH value) mV, wherein the PH value is 5 or less.
REFERENCES:
patent: 3021189 (1962-02-01), Mancke et al.
patent: 3905774 (1975-09-01), Kotting
Ito Shigeru
Nishikawa Kazuyuki
Shibata Tutomu
Suzuki Hiroshi
Sintokogio Ltd.
Thomas Earl C.
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