Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1974-09-16
1976-10-12
Vertiz, Oscar R.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423570, 423573R, C01B 1700, B01J 800, C01B 1702
Patent
active
039858618
ABSTRACT:
An improvement on a process for decreasing the total sulfur content of off-gases from a Claus process is described wherein the sulfur dioxide-containing off-gas is mixed with a reducing gas and passed over a metallic reduction catalyst at elevated temperature to reduce the sulfur dioxide and other convertible sulfur compounds present to hydrogen sulfide followed by cooling of the thusly reduced gas stream at least partially by direct cooling with an aqueous quench liquid and removal of the hydrogen sulfide from the cooled gaseous stream by adsorption on an absorbent or absorbent for hydrogen sulfide, in which process the flow of either or both of the sulfur dioxide containing off-gas and the reducing gas to catalytic reduction is controlled by monitoring the sulfur dioxide content of the reduced gas stream. The improvement comprises monitoring the sulfur dioxide content of the reduced gas stream by subjecting a portion of the liquid quench streams utilized to cool the hydrogen sulfide-containing gas stream from catalyst reduction to stripping with an inert gas thereby substantially removing the hydrogen sulfide and carbon dioxide contained in said quench liquid and measuring the pH of the stripped quench liquid.
REFERENCES:
patent: 3026184 (1962-03-01), Karasek
patent: 3752877 (1973-08-01), Beavon
patent: 3764665 (1973-10-01), Groenendaal et al.
patent: 3854884 (1974-12-01), Robison
Heller Gregory A.
Shell Oil Company
Vertiz Oscar R.
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