C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 11/02 (2006.01) B01J 8/06 (2006.01) C07C 4/06 (2006.01) C07C 5/333 (2006.01) C10G 11/18 (2006.01) C10G 57/00 (2006.01)
Patent
CA 2086099
2086099 9200139 PCTABS00010 An alkane-containing feedstream is passed through one or more tubes, which may contain alkane-dehydrogenation catalyst, immersed in a bed of fluidized particles. The bed is at an elevated temperature which maintains the temperature within the tube(s) at an alkane-dehydrogenation temperature. The particles may be inert, chemically active and/or catalytically active. In one embodiment, cracking catalyst particles are circulated beween a reaction zone (wherein they contact a cracker feedstock which is converted to cracked hydrocarbon products) and a regenerator (22) (wherein carbonaceous deposits on the catalyst particles are exothermically removed by contact with an oxygen-containing gas (24)). Hot regenerated particles from the regenerator (22) are recirculated (27) to the reaction zone for re-use therein. At least some of the circulating cracking catalyst (33) is passed in indirect heat-exchange relationship (42) with an alkane-containing feedstream (44) within a tube (42) whereby alkanes are endothermically dehydrogenated (e.g., to olefins) and the cracking catalyst is cooled. Preferably, the tube (42) contains a dehydrogenation catalyst, and the latter may be circulated between an alkane-dehydrogenation zone (42) and a catalyst re-activation zone (61). In the latter zone, carbonaceous deposits are exothermically removed by an oxygen-containing gas.
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
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