Method for scavenging sulfides
AssigneeCrescent Holdings Limited
InventorsRussell Pounds, Doyle Cherry
Life of this patent
Estimating the term…
Abstract
A method is provides for reducing the levels of hydrogen sulfide and organic sulfides present in gaseous hydrocarbon streams by contacting the streams with a composition comprising the reaction product of an alkanolamine with a C1 to C4 dialdehyde, especially ethanedial. The method involves delivery and storage of the reactants near the gas stream to be cleaned, forming the reaction product at a rate substantially equal to the consumption of scavenger by the sulfides, delivering the scavenger to a contacting vessel, contacting the sulfides in the gas stream with the scavenger to reduce the sulfide concentration below a given level, separating the gas stream from the spent scavenger and removing the spent scavenger from the vessel.
Claims20
A method for reducing the level of hydrogen sulfide or organic sulfides present in a gas comprising the steps of:
- (a) providing a source of a dialdehyde having two carbonyl groups;
- (b) providing a source of an alkanolamine having at least one hydrogen atom bonded directly to a nitrogen atom;
- (c) reacting between about 1.5 and about 6 equivalents of hydrogen atoms bonded directly to a nitrogen atom in the alkanolamine for every equivalent of carbonyl groups in the dialdehyde to form a reaction mixture substantially free of triazines;
- (d) contacting the sulfides in the gas with a scavenger consisting essentially of the reaction mixture, and
- (e) separating the gas from the spent composition.
A method of reducing the level of hydrogen sulfide or organic sulfides present in a gas, a liquid, or a mixture thereof, comprising the step of contacting the sulfides with a composition consisting essentially of the reaction mixture formed from the reaction between:
- (a) a dialdehyde having two carbonyl groups;
- and
- (b) an alkanolamine having at least one hydrogen atom bonded directly to a nitrogen atom, wherein the mounts of dialdehyde and alkanolamine provide between about 1.5 and about 6 equivalents of hydrogen atoms bonded directly to a nitrogen atom in the alkanolamine for every equivalent of carbonyl groups in the dialdehyde, and wherein the reaction mixture is substantially free of triazines.
Dependencies are inferred from the claim text.