Two catalyst process for making olefin
AssigneeExxonMobil Chemical Patents Inc.
InventorsLuc R. M. Martens, Keith H. Kuechler, James R. Lattner
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Abstract
This invention is to a process of making olefin, particularly ethylene and propylene, from an oxygenate feed. The invention uses two or more zeolite catalysts. Examples of zeolite catalysts include a first catalyst containing of ZSM-5, and a second catalyst containing a 10-ring molecular sieve, including but not limited to, ZSM-22, ZSM-23, ZSM35, ZSM-48, and mixtures thereof. The ZSM-5 can be unmodified, phosphorous modified, steam modified having a micropore volume reduced to not less than 50% of that of the unsteamed ZSM-5, or various mixtures thereof.
Claims15
A method of making light olefins, comprising contacting an oxygenate feed with a first zeolite catalyst comprising a ZSM-5 molecular sieve to form a first product;
- and
- contacting at least a portion of the first product with a second zeolite catalyst comprising a ZSM-35 molecular sieve to form a second product.
A method of making an olefin composition comprising:
- contacting an oxygenate with a first zeolite catalyst comprising a ZSM-5 molecular sieve to form a first olefin product;
- separating a butylene containing stream from the first olefin product;
- and
- contacting the butylene containing stream with a second zeolite catalyst comprising a ZSM-35 molecular sieve to form a second olefin product.
Dependencies are inferred from the claim text.