Acid extraction of molecular sieve catalysts to improve ethylene yield
AssigneeExxon Chemical Patents Inc.
InventorMarcel J. G. Janssen
Life of this patent
Estimating the term…
Abstract
A method for enhancing ethylene yield in the conversion of oxygenates to olefins that involves extracting molecular sieve catalysts, such as silicoaluminophosphate catalysts, with a mineral acid is provided. Acid extraction is thought to alter the crystallinity of the molecular sieve catalyst and thereby improve ethylene yield.
Claims20
A method for converting oxygenates to olefins, comprising extracting a silicoaluminophosphate (SAPO) catalyst with an acid which is from about 0.0001N to about 1N in strength to produce an acid extracted catalyst, then treating an oxygenate feed with said acid extracted catalyst under effective conversion conditions to form an olefin product.
A method for converting oxygenates to olefins, comprising treating an oxygenate feed with an acid-extracted silicoaluminophosphate (SAPO) catalyst wherein said silicoaluminophosphate is SAPO-34, wherein said catalyst has been extracted with an acid which is from about 0.0001N to about 1N in strength, wherein said acid is hydrochloric acid, and wherein said extraction step is conducted for up to about 30 hours under effective conversion conditions to form an olefin product.
Dependencies are inferred from the claim text.