Method of treating vapors containing ammonia and hydrogen sulfide
AssigneeKrupp-Koppers GmbH
InventorsHans-Peter Minak, Manfred Gross
Life of this patent
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Abstract
Ammonia and 5 to 40 volume percent hydrogen sulfide containing vapors which arise in the vaporization of process water from hydrogenation or a crude oil fraction or in gas treatment in a coking plant, can be subjected in a cracking catalyst reactor to breakdown of the ammonia to nitrogen and hydrogen. The resulting process gas is cooled to 250.degree. to 350.degree. C. and is fed to a hydrogenation reactor where any sulfur is hydrogenated to the hydrogen sulfide. The process gas can then be subjected to further treatment without the danger of sulfur blockage of the process lines. For example, the hydrogen sulfide can be removed by a selective absorption process.
Claims12
A process for continuously treating vapor containing ammonia and 5 to 40 percent by volume hydrogen sulfide, without interruption by deposition of elemental sulfur, said process consisting essentially of the steps of:
- (a) introducing a vapor containing ammonia and 5 to 40 percent by volume hydrogen sulfide into a cracking furnace at a temperature of substantially 1000.degree. to 1200.degree. C. in a reducing atmosphere to produce a process gas containing ammonia and elemental sulfur, said elemental sulfur deliberately retained as vapor in said process gas;
- (b) feeding said process gas to a cracking catalyst and converting the ammonia in said process gas to a hydrogen/nitrogen mixture in said process gas;
- (c) thereafter cooling said process gas from step (b) with said elemental sulfur and said hydrogen/nitrogen mixture therein to a temperature in a range of 250.degree. C. to 350.degree. C. to form a cooled process gas;
- (d) passing the gas from step (c) containing all the sulfur formed in step (a) to a hydrogenation zone, hydrogenating the sulfur with hydrogen formed in step (b) to convert all the sulfur in the process gas to hydrogen sulfide;
- and
- (e) recovering a process gas containing hydrogen sulfide from said hydrogenation reactor.
Dependencies are inferred from the claim text.