Process for regenerating nitrogen-treated carbonaceous chars used for hydrogen sulfide removal
AssigneeCalgon Carbon Corporation
InventorsRichard Hayden, Steven L. Butterworth
Life of this patent
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Abstract
A process is provided for the restoration of hydrogen sulfide removal capacity in nitrogen-treated carbonaceous chars which have become exhausted for hydrogen sulfide capacity when used for the removal of hydrogen sulfide from gas streams containing oxygen and water. This process entails washing the spent carbonaceous char with water of sufficient quantity to remove the majority of the hydrogen sulfide reaction products. By the use of this process a significant proportion of the original hydrogen sulfide capacity of the nitrogen-treated carbonaceous char is recovered.
Claims9
A process for restoring hydrogen sulfide removal capacity in nitrogen-treated carbonaceous char, said char having reduced capacity for hydrogen sulfide removal as a result of exposure to gas streams containing hydrogen sulfide, oxygen, and H.sub.2 O, said char prepared prior to said exposure by treatment of a carbonaceous material at temperatures above 700.degree. C. in the presence of a nitrogen-containing compound, said process for restoring hydrogen sulfide removal capacity comprising the steps of:
- (a) contacting said hydrogen sulfide, in the presence of said oxygen and H.sub.2 O, with said nitrogen-treated carbonaceous char, to convert said hydrogen sulfide into sulfuric acid;
- (b) contacting said char, after exposure to hydrogen sulfide and conversion of said hydrogen sulfide into sulfuric acid, with water at temperatures less than 100.degree. C.;
- and
- (c) removing the contacted water from the said char.
Dependencies are inferred from the claim text.