C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/682.2
C07C 5/333 (2006.01) C07C 5/32 (2006.01) C07C 15/46 (2006.01)
Patent
CA 1265539
"HYDROCARBON DEHYDROGENATION PROCESS WITH OXIDATIVE REHEAT" ABSTRACT Dehydrogenatable hydrocarbons such as alkylaromatic hydrocarbons (e.g. ethylbenzene) are catalytically dehydrogenated with minimum produc- tion of thermal by-products by using several reactors containing de- hydrogenation catalyst in series flow with interstage heating being sup- plied by selective combustion of hydrogen produced in the process. The selective combustion of hydrogen is performed in a reactor which has a relatively small bed of dehydrogenation catalyst located adjacent to the bed of selective hydrogen oxidation catalyst and which has a flow path such that the entering hydrogen-containing stream first contacts the bed of oxidation catalyst and immediately thereafter contacts the bed of the dehydrogenation catalyst. Thus the stream passed to the reactor is heated to a relatively high temperature in the oxidation bed as exothermic combus- tion of hydrogen and then immediately cooled to a somewhat lower temperature in the small bed of dehydrogenation catalyst by the endothermic dehydrogena- tion reaction. This sequence of steps shortens the time the reactants are maintained at high temperatures which produce undesired by-products and reduces the temperature of the reactants prior to transport through a conduit to the main bed of dehydrogenation catalyst.
510902
Macrae & Co.
Uop Inc.
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