Process for the production of carbon disulfide from sulfur dioxide removed from a flue gas
AssigneesNew England Power Company, Northeast Utilities Service Company
InventorsJames R. Kittrell, Charles W. Quinlan
Life of this patent
Estimating the term…
Abstract
A process for the recovery of carbon disulfide from a flue gas. A stream of sulfur dioxide is removed from a flue gas and introduced into a first reduction reactor containing a chromium promoted iron oxide catalyst where the sulfur dioxide is reduced to carbonyl sulfide. The carbonyl sulfide is introduced into a second reduction reactor which contains an active alumina catalyst. The carbonyl sulfide decomposes to carbon disulfide which is recovered.
Claims4
A method for the production of carbon disulfide from sulfur dioxide removed from a gaseous effluent which includes:
- (a) removing sulfur dioxide as a stream from a flue gas;
- (b) compressing the stream of step (a) and subsequently removing water from said stream;
- (c) blending carbon monoxide and nitrogen with the stream of step (b);
- the sulfur dioxide in the stream being between about 5-33%;
- (d) introducing the stream of step (c) which consists essentially of nitrogen, carbon monoxide and sulfur dioxide at a temperature between about 500.degree. F. to 900.degree. F. into a first reduction reactor containing a chromium-promoted iron oxide catalyst;
- (e) reducing between 60 to 99+% of the sulfur dioxide to carbonyl sulfide, the remainder being reduced to sulfur;
- (f) discharging a stream from the first reduction reactor, which stream consists essentially of carbonyl sulfide, sulfur, nitrogen and carbon dioxide;
- (g) introducing the stream of step (f) into a second reduction reactor which contains a catalysts of the group consisting of silica-alumina, faujasties and active alumina to decompose a portion of the carbonyl sulfide to form carbon disulfide at a temperature between about 400.degree. F. to 800.degree. F.;
- and
- (h) recovering the carbon disulfide formed.
Dependencies are inferred from the claim text.