Single stage reactor system with oxidative preheat for dehydrogenation of hydrocarbons
AssigneeUop LLC
InventorsDaniel H. Wei, Laurence O. Stine
Life of this patent
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Abstract
A single stage dehydrogenation reactor system including a charge heater and one or more reactors is described. The hydrocarbon feed is combined with hydrogen and heated in a charge heater to a temperature lower than the dehydrogenation temperature to avoid thermal cracking. Before entering the dehydrogenation reactors, oxygen is added. The oxidative preheat then takes place in the presence of the dual functional catalyst which has dehydrogenation and selective oxidation activities. The oxygen selectively burns hydrogen and raises the reaction temperature, and the dehydrogenation reaction then occurs.
Claims20
A process for dehydrogenation of hydrocarbons comprising:
- preheating a feed comprising a hydrocarbon feed and hydrogen to a temperature lower than a dehydrogenation temperature;
- introducing an oxygen-containing gas to the preheated feed;
- introducing the preheated feed with the oxygen-containing gas into a dehydrogenation reaction zone comprising a dehydrogenation reactor containing a dual functional catalyst having dehydrogenation and selective oxidation activities;
- contacting the preheated feed with the catalyst in the dehydrogenation reactor to selectively oxidize the hydrogen to further heat the preheated feed;
- and
- contacting the heated feed with the catalyst in the dehydrogenation reactor under dehydrogenation conditions to form olefins and hydrogen.
A process for dehydrogenation of hydrocarbons comprising:
- preheating a feed comprising a hydrocarbon feed and hydrogen to a temperature in a range of about 480 to about 580° C.;
- introducing an oxygen-containing gas and steam to the preheated feed;
- introducing the preheated feed with the oxygen-containing gas and steam into a dehydrogenation reaction zone comprising at least two dehydrogenation reactors connected in parallel, the at least two dehydrogenation reactors containing a dual functional catalyst having dehydrogenation and selective oxidation activities, a portion of the preheated feed with the oxygen-containing gas and steam being sent to each dehydrogenation reactor;
- contacting the preheated feed with the catalyst in the at least two dehydrogenation reactors to selectively oxidize the hydrogen to further heat the preheated feed;
- contacting the heated feed with the catalyst in the at least two dehydrogenation reactors under dehydrogenation conditions to form olefins and hydrogen.
Dependencies are inferred from the claim text.