Method for adding heat to a reactor system used to convert oxygenates to olefins
AssigneeExxonMobil Chemical Patents Inc.
InventorsJames R. Lattner, Keith H. Kuechler, Richard E. Walter
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Abstract
The present invention provides a method for adding heat to a reactor system used to convert oxygenates to olefin, in which supplemental heat is added with a heating fuel, e.g., a torch oil, having low autoignition temperature, low sulfur, and low nitrogen content.
Claims35
A process for making an olefin product from an oxygenate feedstock in the presence of an oxygenate to olefin molecular sieve catalyst which comprises:
- a) contacting at least a portion of the catalyst with a regeneration medium in a regeneration zone;
- b) heating said regeneration zone to a first temperature of at least 225° C. (437° F.),
- c) feeding to said regeneration zone a heating fuel having an autoignition temperature less than the first temperature and containing less than 500 wppmw sulfur and less than 200 wppm nitrogen, thereby causing the heating fuel to ignite and provide a heated catalyst;
- d) circulating said heated catalyst to the reaction zone;
- and
- e) additionally contacting the feedstock in a reaction zone with said oxygenate to olefin molecular sieve catalyst including said heated catalyst, under conditions effective to convert the feedstock into an olefin product stream.
A method of adding heat to a reactor system having an oxygenate to olefin reaction zone and a catalyst regeneration zone wherein catalyst is cycled from the reaction zone to the regeneration zone and from the regeneration zone to the reaction zone, the method comprising:
- fluidizing catalyst in the regeneration zone in the presence of an oxygen containing gas;
- heating the catalyst in said regeneration zone to a first temperature;
- introducing a heating fuel into the regeneration zone wherein the heating fuel has about 500 wppm or less of sulfur and has about 200 wppm or less nitrogen and an autoignition temperature greater than the first temperature but no greater than about 482° C. (900° F.) to provide a heated catalyst;
- and
- providing the heated catalyst into the reaction zone.
A process for initially increasing the temperature of a reactor system for making an olefin product from an oxygenate feedstock in the presence of an oxygenate to olefin molecular sieve catalyst which process comprises:
- a) contacting at least a portion of the catalyst with a regeneration medium in a regeneration zone;
- b) heating said regeneration zone to a first temperature of at least 225° C. (437° F.),
- c) feeding to said regeneration zone a heating fuel having an autoignition temperature less than the first temperature and containing less than 500 wppm sulfur and less than 200 wppm nitrogen, thereby causing the heating fuel to ignite and provide a heated catalyst;
- and
- d) circulating said heated catalyst to the reaction zone.
Dependencies are inferred from the claim text.