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US 5,698,171 AGranted
Regenerative method for removing sulfides from gas streams
AssigneeQuaker Chemical Corporation
InventorsEdward A. Trauffer, Muge Caglar
Life of this patent
Estimating the term…
Abstract
streams. The method includes contacting the sulfide-containing gas stream with an aqueous scavenging mixture which includes a scavenging compound, that is a product of reaction between an aldehyde and a nitrogen compound, an inorganic ion and an oxidation catalyst: regenerating at least a portion of the scavenging compound with an oxygen-containing gas and returning at least a portion of the aqueous scavenging mixture to the contacting zone.
Claims20
A method for the removal of sulfides from gaseous streams comprising
- (a) contacting the sulfide containing gas stream in a contacting zone with an aqueous scavenging mixture, said scavenging mixture comprising an aminal scavenging compound, an inorganic base and a polyvalent metal oxidation catalyst for a period of time to at least partially reduce the level of hydrogen sulfide in the gas stream,
- (b) regenerating at least a portion of said aminal scavenging compound with a gas selected from the group consisting of air, oxygen enriched air, oxygen, ozone enriched air and ozone in a regeneration zone, and
- (c) returning at least a portion of the aqueous scavenging mixture to the contacting zone.
A method for the removal of sulfides from gaseous streams comprising
- (a) contacting the sulfide containing gas stream with a scavenging mixture, said scavenging mixture comprising at least one of the compounds selected from the group consisting of compounds of formula I, IV and formula V:
- ##STR9## where n is an integer from 1 to 1000 and each of R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 is independently selected from the group consisting of (i) hydrogen;
- (ii) a substituted or unsubstituted, saturated or unsaturated, linear, branched or cyclic hydrocarbon chain of 1 to 20 carbons, (iii) a substituted or unsubstituted, saturated or unsaturated, linear, branched or cyclic hydrocarbon chain of 1 to 20 carbons comprising at least one heteroatom selected from the group consisting of nitrogen, oxygen, sulfur and halogen;
- (v) a substituted or unsubstituted polymeric chain;
- and (v) a direct bond to any other of R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 ;
- wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 may be individually bonded to one another;
- an inorganic base selected from a group consisting of group I and group II ions;
- and
- a polyvalent metal oxidation catalyst selected from the group consisting of iron, copper, vanadium, manganese, platinum, tungsten, nickel, mercury, tin and lead;
- (b) regenerating at least a portion of the scavenging compound with a gas selected from the group consisting of air, oxygen enriched air, oxygen, ozone enriched air and ozone in a regeneration zone, and
- (c) returning at least a portion of the aqueous scavenging mixture to the contacting zone.
8 more elements
Dependencies are inferred from the claim text.