| US 7,531,705 B2 | ||
| Method for adding heat to a reactor system used to convert oxygenates to olefins | ||
| James R. Lattner, Seabrook, Tex. (US); Keith H. Kuechler, Friendswood, Tex. (US); and Richard E. Walter, Long Valley, N.J. (US) | ||
| Assigned to ExxonMobil Chemical Patents Inc., Houston, Tex. (US) | ||
| Filed on Nov. 20, 2006, as Appl. No. 11/601,999. | ||
| Application 11/601999 is a division of application No. 10/822995, filed on Apr. 13, 2004, granted, now 7,148,171. | ||
| Application 10/822995 is a division of application No. 10/422924, filed on Apr. 24, 2003, granted, now 6,768,036. | ||
| Application 10/422924 is a continuation in part of application No. 10/152908, filed on May 22, 2002, abandoned. | ||
| Claims priority of provisional application 60/345681, filed on Dec. 31, 2001. | ||
| Prior Publication US 2007/0078287 A1, Apr. 05, 2007 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. C07C 1/20 (2006.01) | ||
| U.S. Cl. 585—639 [585/640] | 10 Claims |
| 1. 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 at a first temperature;
b) feeding to said regeneration zone during a preheat time 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 having a temperature of at least 225° C.;
c) circulating said heated catalyst to the reaction zone; and
d) contacting the feedstock in a reaction zone with said oxygenate to olefin molecular sieve catalyst including said heated
catalyst, during the preheat time or thereafter, under conditions effective to convert the feedstock into an olefin product
stream comprising light olefins; and then
e) polymerizing the light olefins to make polyolefins.
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