Nondestructive trivalent cation exchange of molecular sieves
AssigneeAmoco Corporation
InventorMarvin R. Klotz
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Abstract
A method is provided for the nondestructive trivalent cation ion exchange of molecular sieves comprising ion exchanging at least one molecular sieve with at least one trivalent cation, wherein the ion exchange is performed at ion exchange conditions with an ion exchange solution comprising the trivalent cation, a trivalent cation complexing agent, and a suitable amount of a hydroxide-producing component to form an ion exchange solution having a pH ranging from about 4 to about 8.
Claims20
A method for the nondestructive trivalent cation ion exchange of molecular sieves comprising ion exchanging at least one molecular sieve with at least one trivalent cation, wherein said ion exchange is performed at ion exchange conditions with an ion exchange solution comprising said trivalent cation, a trivalent cation complexing agent comprising at least one member selected from the group consisting of alpha hydroxy-carboxylic acid, alpha amino-carboxylic acid, beta hydroxy-carboxylic acid, beta amino-carboxylic acid, gamma hydroxy-carboxylic acid, gamma amino-carboxylic acid, lactic acid, tartaric acid, glycine, and 15-crown-5, and a suitable amount of a hydroxide-producing component to form an ion exchange solution having a pH ranging from about 4 to about 8.
A method for the nondestructive aluminum ion exchange of molecular sieves comprising ion exchanging at least one molecular sieve with an aluminum cation, wherein said ion exchange is performed at ion exchange conditions with an ion exchange solution comprising said aluminum cation, a trivalent cation complexing agent comprising at least one member selected from the group consisting of 2-hydroxypropionic acid, 2-hydroxyacetic acid, 2-hydroxybutanoic acid, 2-hydroxypentanoic acid, 3-hydroxybutanoic acid, and 3-hydroxypentanoic acid, and a suitable amount of ammonium hydroxide to form an ion exchange solution having a pH ranging from about 4.5 to about 7.0.
A method for the nondestructive aluminum ion exchange of molecular sieves comprising ion exchanging at least one molecular sieve with an aluminum cation, wherein said ion exchange is performed at ion exchange conditions with an ion exchange solution comprising said aluminum cation, a trivalent cation complexing agent comprising 2-hydroxypropionic acid, and a suitable amount of ammonium hydroxide to form an ion exchange solution having a pH ranging from about 4.5 to about 7.0.
Dependencies are inferred from the claim text.