Fast, high capacity hydrogen sulfide scavengers
AssigneeBaker Hughes Incorporated
InventorsTauseef Salma, Alexander A. Lambert, III, Gordon T. Rivers
Life of this patent
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Abstract
Selective, irreversible removal of hydrogen sulfide (H2S) and other sulfhydryl compounds from a gas stream, such as sour natural gas and sour hydrocarbon liquids is achieved with a scavenging agent having hydroxyalkyl functionality and alkylamine functionality. This scavenger possesses a higher capacity for H2S removal compared with a scavenger having only hydroxyalkyl functionality. The scavenging agent is made by reacting at least one alkanolamine and at least one alkyl amine with an aldehyde, such as formaldehyde.
Claims24
A method for reducing an amount of sulfhydryl compounds in sour aqueous or sour hydrocarbon substrates, or combinations thereof, comprising scavenging said sulfhydryl compounds from said substrate with a scavenging agent comprising a triazine having both hydroxyalkyl and alkylamine functionality, the agent present in an amount sufficient to reduce said amount of said sulfhydryl compounds in said substrate.
A method for reducing an amount of sulfhydryl compounds in sour hydrocarbon gas comprising contacting a sour hydrocarbon gas comprising at least one sulfhydryl compound with a triazine scavenging agent present in an amount ranging from about 0.00045 to about 13.4 gallons per ppm of sulfhydryl compound×MMscf of gas (about 0.06 to about 1790 liters scavenger used/(ppm sulfhydryl compound removed×MMscm)), where the triazine has the structure:
- where the R groups are independently selected from the group consisting of C1-C20 straight or branched alkyl groups and —R1OH, where R1 is a C1-C20 straight or branched alkylene group, provided that at least one R group is C1-C20 straight or branched alkyl groups and at least one R group is —R1OH.
A substrate treated to reduce the presence of at least one sulfhydryl compound comprising:
- a sour substrate selected from the group consisting of sour aqueous substrates, sour hydrocarbon substrates, and mixtures thereof, the substrate containing at least one sulfhydryl compound;
- and
- a scavenging agent comprising a triazine having both hydroxyalkyl and alkylamine functionality, the agent present in an amount sufficient to reduce the amount of the at least one sulfhydryl compound in the substrate as compared with the same substrate absent the scavenging agent.
A sour hydrocarbon gas treated to reduce the presence of at least one sulfhydryl compound comprising:
- a sour hydrocarbon gas containing at least one sulfhydryl compound;
- and
- a scavenging agent in an amount of from about 0.00045 to about 13.4 gallons per ppm of sulfhydryl compound×MMscf of gas (about 0.06 to about 1790 liters scavenger used/(ppm sulfhydryl compound removed×MMscm)), a scavenging agent comprising a triazine has the structure:
- where the R groups are independently selected from the group consisting of C1-C20 straight or branched alkyl groups and —R1OH, where R1 is a C1-C20 straight or branched alkylene group, provided that at least one R group is C1-C20 straight or branched alkyl groups and at least one R group is —R1OH.
Dependencies are inferred from the claim text.