Use of elemental oxygen to inhibit elution of antimony from an antimony-ZSM-5 catalyst
AssigneeMobil Oil Corporation
InventorsNai Yuen Chen, William Joseph Reagan
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Abstract
The lower monohydric alcohols and their ethers, especially methanol and dimethyl ether, are converted to a hydrocarbon mixture mostly ethylene, propylene and mononuclear aromatics, by co-feeding elemental oxygen and said alcohol and/or ether to a catalytic reactor that contains as catalyst a composite of antimony oxide and a crystalline aluminosilicate zeolite such as ZSM-5. Co-feeding elemental oxygen effectively inhibits the elution of antimony from the catalytic reactor.
Claims12
An improved process for producing hydrocarbons, which comprises:
- passing to a catalytic conversion zone, under conversion conditions, a feed comprising oxygenated compounds and a co-feed of elemental oxygen, said oxygenated compounds consisting essentially of one or more lower monohydric alcohol having up to four carbon atoms, the ethers derived therefrom, or mixtures of said alcohols and ethers, said co-feed being passed in an amount equal to from 0.1 mol percent to 10 mol percent of said feed, and said catalytic conversion zone containing a catalyst comprising an intimate admixture of an oxide of antimony and a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12 and a constraint index from 1 to 12, said antimony oxide constituting at least 1% by weight of said admixture, and recovering from said catalytic conversion zone a mixture comprising light olefins, monocyclic aromatic hydrocarbons and steam.
A method for suppressing the elution of antimony during catalytic conversion of a feed with a catalyst comprising an intimate admixture of an oxide of antimony and a crystalline aluminosilicate zeolite, which comprises:
- co-feeding an amount of elemental oxygen effective to suppress said elution of antimony.
Dependencies are inferred from the claim text.