Methanol conversion to para-xylene using a zeolite catalyst containing an oxide of boron, magnesium, phosphorus, or mixtures
AssigneeMobil Oil Corporation
InventorWarren W. Kaeding
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Abstract
A catalytic process is provided for converting lower monohydric alcohols and their ethers, especially methanol and dimethyl ethers, to a hydrocarbon mixture rich in C.sub.2 -C.sub.3 olefins and mononuclear aromatics with high selectivity for para-xylene production by contact, under conversion conditions, with a catalyst comprising a crystalline aluminosilicate zeolite, said zeolite having a silica to alumina ratio of at least about 12 and a constraint index, as hereinafter defined, within the approximate range of 1 to 12, said catalyst having been modified by the addition thereto of a minor proportion of an oxide of boron or magnesium either alone or in combination, or in further combination with an oxide of phosphorus.
Claims12
A process for producing hydrocarbons which compises contacting, under conversion conditions, a charge consisting essentially of 1 or more lower monohydric alcohols having up to 4 carbon atoms, the ethers derived therefrom or mixtures of said alcohols and ethers with a catalyst comprising a crystalline aluminosilicate zeolite, said zeolite having a silica to alumina ratio of at least about 12, a constraint index within the approximate range of 1 to 12, and having combined therewith:
- (1) between about 0.25 and about 25 percent by weight of boron oxide;
- or
- (2) between about 0.25 and about 5 percent by weight of boron oxide in combination with between about 2 and about 15 percent by weight of magnesium oxide;
- or
- (3) between about 0.25 and about 10 percent by weight of phosphorus oxide in combination with between about 0.25 and about 25 percent by weight of boron oxide or magnesium oxide;
- or
- (4) between about 0.25 and about 10 percent by weight of phosphorus oxide in combination with between about 0.25 and about 5 percent by weight of boron oxide and between about 2 and about 15 percent by weight of magnesium oxide, whereby there is formed a mixture comprising light olefinic hydrocarbons, monocyclic aromatic hydrocarbons, high in paraxylene content, and water and recovering said hydrocarbons.
Dependencies are inferred from the claim text.