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US 7,977,521 B2Granted
Oxygenate to olefins process involving supercritcal conditions
AssigneeExxonMobil Chemical Patents Inc.
InventorsLuc R. M. Martens, Stephen N. Vaughn, John R. Shutt
Life of this patent
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Abstract
This invention, in one embodiment, is drawn to a process for forming olefin product by contacting an oxygenate with an olefin-forming catalyst under supercritical conditions to form an olefin product. This invention also relates to methods for activating molecular sieve catalyst, regenerating molecular sieve catalyst, and forming and/or disposing a co-catalyst within a molecular sieve catalyst, each under supercritical conditions.
Claims14
A process for forming olefin product, comprising:
- contacting supercritical oxygenate in a reactor with molecular sieve catalyst to form an olefin product comprising olefin, water and unreacted oxygenate at a temperature of at least 275° C. and a total reactor pressure of at least 200 bar (20 MPa) such that all non-solid phase components are supercritical, therein forming coked or partially coked molecular sieve catalyst;
- reducing pressure, temperature or a combination of pressure and temperature of the olefin product below supercritical;
- and
- separating at least a portion of the olefin from the water and unreacted oxygenate;
- and
- wherein less than 30% of the molecular sieve catalyst is withdrawn from the reactor or reaction zone and exposed to regeneration conditions comprising contacting the coked or partially coked molecular sieve catalyst with a supercritical fluid to extract at least a portion of the coke from cages of the catalyst.
3 more elements
A process for forming olefin product, comprising:
- contacting oxygenate with molecular sieve catalyst in a reactor to form an olefin product comprising olefin, water, and unreacted oxygenate, wherein the reactor is maintained at a temperature of at least 275° C. and a total reactor pressure of at least 200 bar (20 MPa) such that all non-solid phase components are supercritical, therein forming coked or partially coked molecular sieve catalyst;
- reducing pressure, temperature, or a combination of pressure and temperature of the olefin product below supercritical;
- and
- separating at least a portion of the olefin from the water and unreacted oxygenate;
- and
- wherein less than 30% of the molecular sieve catalyst is withdrawn from the reactor or reaction zone and exposed to regeneration conditions comprising contacting the coked or partially coked molecular sieve catalyst with a supercritical fluid to extract at least a portion of the coke from cages of the catalyst;
- and
- further comprising contacting the regenerated molecular sieve catalyst having a porous framework structure with a pre-treatment composition at supercritical conditions in a pre-treatment zone to form an integrated hydrocarbon co-catalyst within the porous framework of the molecular sieve, the pre-treatment composition includes one or more aromatic hydrocarbons;
- then, the pre-treated molecular sieve catalyst containing the integrated hydrocarbon co-catalyst is sent to the reactor and contacted with oxygenate to convert the oxygenate to olefin product.
6 more elements
Dependencies are inferred from the claim text.