Patent ID: 7517447

Claim:
A method comprising the step of: contacting a fluid including noxious sulfur-containing species with an effective amount of a sulfur scavenging composition comprising substantially monomeric aldehyde-amine adducts formed from a reaction of a molar excess of at least one aldehyde or aldehyde donor and at least one secondary amine or a primary amine having at least one sterically bulk substituent so that the adducts are substantially compounds derived from the reaction of a single aldehyde and a single amine so that the resulting adducts comprise amines bonded to three different groups where two of the groups can be a part of a ring structure and characterized by compounds of formulas (I), (II) or mixtures thereof: CH 2 R—NR 1 R 2 (I) CH 2 R—R 4 NR 3 NR 5 —CH 2 R (II) where R is a hydrogen atom (H) or a carbon-containing group, R 1 and R 2 are the same or different, at least one being a sterically hindered carbon-containing group having between 3 and about 24 carbon atoms or R 1 and R 2 can form a ring system, R 3 is a divalent sterically hindered carbon-containing group, R 4 and R 5 are the same or different and are H or a CH 2 R group, provided that both R 4 and R 5 are not H and where one or more of the carbon atoms of R, R 1 , R 2 , R 3 , R 4 , R 5 or mixtures thereof can be replaced by oxygen atoms in the form of ether moieties, nitrogen groups in the form of tertiary amine or amide moieties or mixtures thereof, and where one or more hydrogen atoms of R, R 1 , R 2 , R 3 , R 4 , R 5 or mixtures thereof can be replaced by fluorine atoms, chlorine atoms or mixtures thereof, where the CH 2 R groups are derived from the at least one aldehyde of the formula R—CHO used in the reaction and where the effective amount is sufficient to reduce, to reduce below a target level or to substantially eliminate the noxious sulfur-containing species in the fluid.