Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Carbon dioxide or hydrogen sulfide component
Patent
1976-01-30
1976-11-23
Thomas, Earl C.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Carbon dioxide or hydrogen sulfide component
423234, 423236, 423238, 423242, 423143, 423144, 423150, 423523, 423550, 423632, 134 3, 134 10, C01C 1242, C01B 1776, C23G 108, C01C 304
Patent
active
039937305
ABSTRACT:
A continuous process is provided which has the primary purpose of removing NH.sub.3, H.sub.2 S, HCN, and (CN).sub.2 from the subject gas mixtures and the secondary purpose of producing (NH.sub.4).sub.2 SO.sub.4 and iron oxide for industrial uses. The gas mixture which contains tar and other condensible vapors, NH.sub.3, H.sub.2 S, HCN, and (CN).sub.2 together with small volumes of gas from the ammonia still of the system, and gas from a system H.sub.2 SO.sub.4 plant, is contacted in a single three-stage reaction chamber in the presence, if need be, of a tar solvent, additional NH.sub.3, and the reagent Fe(OH).sub.2, which itself is a product of a concurrent reaction between NH.sub.3 and FeSO.sub.4. The unpurified gas mixture's condensible vapors are largely prevented from condensing by maintaining a steady, elevated temperature, while the mixture is essentially freed of HCN, (CN).sub.2, NH.sub.3, and H.sub.2 S in the reactor before the gas mixture passes through a primary gas cooler. The gas then passes through a benzene, toluene, and xylene absorber before being pressurized and distributed. The spent reaction chamber reagent is separated to produce tar and solvent; (NH.sub.4).sub.2 SO.sub.4, solution, and iron precipitates. Sulfur dioxide released by the iron oxide production process is used to produce H.sub.2 SO.sub.4, which in turn is either reacted with scrap iron, or used in a metal pickling operation to produce FeSO.sub.4 for use in preparation of the reaction chamber reagent.
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Brown William S.
Fraser Donald R.
Hearn Brian E.
Thomas Earl C.
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