Dehydrogenation of dehydrogenatable hydrocarbons
This patent describes a process for the dehydrogenation of a dehydrogenatable hydrocarbon with separate and intermediate selective oxidation of hydrogen which comprises the steps of: (a) contacting the hydrocarbon with a dehydrogenation catalyst comprising an alkaline metal-promoted iron compound in a first-reaction dehydrogenation zone in the presence of steam at dehydrogenation conditions to produce a first-reaction dehydrogenation zone effluent stream comprising a mixture of unconverted hydrocarbons, dehydrogenated hydrocarbons, hydrogen and steam; (b) removing the first-reaction dehydrogenation zone effluent from the first-reaction dehydrogenation zone; (c) passing the effluent of step (b) to a second-reaction oxidation zone, which is separate and discrete from the first-reaction dehydrogenation zone; (d) contacting the first-reaction dehydrogenation zone effluent in the second-reaction oxidation zone with an oxygen-containing gas to selectively oxidize the hydrogen; (e) withdrawing the unconverted and dehydrogenated hydrocarbons from the second-reaction oxidation zone having an increased temperature with respect to the temperature of the first-reaction dehydrogenation zone effluent; (f) passing the removed second-reaction oxidation zone product stream of step (e) to a third-reaction dehydrogenation zone containing a dehydrogenation catalyst comprising an alkaline metal promoted iron compound at dehydrogenation conditions to produce dehydrogenated hydrocarbons; and, (g) withdrawing and recovering the dehydrogenated hydrocarbons, the improvement which comprises utilizing as the support a cerium-containing alumina.
- Assignee:
- UOP Inc., Des Plaines, IL
- Patent Number(s):
- US 4691071
- OSTI ID:
- 6091239
- Country of Publication:
- United States
- Language:
- English
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