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US 11,427,524 B2Granted
Process for dehydrating methanol to dimethyl ether product
AssigneeBp P.L.C.
InventorsBenjamin James Dennis-Smither, John Glenn Sunley
Life of this patent
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Abstract
A process for dehydrating methanol to dimethyl ether product in the presence of a solid Brønsted acid catalyst which is an aluminosilicate zeolite or a heteropolyacid and a promoter which is (i) a ketone of formula R1COR2 (Formula I) in which R1 and R2 are identical or different and are each a C1-C11 alkyl group and furthermore R1 and R2 together with the carbonyl carbon atom to which they are bonded may form a cyclic ketone; or (ii) a ketal derivative of a ketone of Formula I; and the molar ratio of promoter to methanol is maintained at 0.5 or less.
Claims17
A process comprising:
- dehydrating methanol to dimethyl ether product in the presence of a catalyst and a promoter, and in the absence of methyl acetate, wherein the catalyst is at least one solid Brønsted acid catalyst selected from aluminosilicate zeolites and heteropolyacids, and the promoter is at least one
- (i) a ketone of formula R1COR2 (Formula I)
- wherein R1 and R2 are identical or different and are each a C1-C11 alkyl group, or R1 and R2 together with the carbonyl carbon atom to which they are bonded form a cyclic ketone;
- or
- (ii) a ketal derivative of the ketone of Formula I;
- and
- wherein a molar ratio of the promoter to the methanol is maintained at 0.5 or less.
4 more elements
Dependencies are inferred from the claim text.