Dehydrogenation process having improved run time
AssigneeUop LLC
InventorsAlan E. Cepla, Gary A. Dziabis, Manuela Serban, Rui de Menezes, Massimiliano Cantarelli
Life of this patent
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Abstract
New/fresh catalyst is added to a dehydrogenation unit and aged catalyst is removed from the dehydrogenation unit on a continuous or semi-continuous basis while the dehydrogenation unit is in operation. The conversion achieved by the higher activity catalyst results in the production rate of olefin product being maintained at near start-of-run production for longer, with a slower rate of decline. The higher activity catalyst extends run time, reduces feed consumption for each unit of olefin product, and minimizes fresh catalyst expenses.
Claims19
A process for dehydrogenation of a hydrocarbon feed comprising:
- providing a hydrocarbon feed stream comprising at least one paraffin to a dehydrogenation unit comprising a moving bed reactor;
- contacting the feed stream with a catalyst in the reactor under dehydrogenation conditions, the catalyst having a particle size in a normal operating range;
- removing an effluent stream comprising at least one olefin from the reactor;
- and
- periodically removing a portion of the catalyst and replacing the portion of the catalyst removed with fresh catalyst while continuing to operate the reactor, wherein the portion of the catalyst removed has a particle size in the normal operating range.
A process for dehydrogenation of a hydrocarbon feed comprising:
- providing a hydrocarbon feed stream comprising at least one paraffin to a dehydrogenation unit comprising a moving bed reactor;
- contacting the feed stream with a catalyst in the reactor under dehydrogenation conditions;
- removing an effluent stream comprising at least one olefin from the reactor;
- and
- periodically removing between 5 wt % and 50 wt % of a total amount of the catalyst in the dehydrogenation unit every 60 to 120 days of operating time and replacing the removed catalyst with fresh catalyst while continuing to operate the reactor.
A process for dehydrogenation of a hydrocarbon feed comprising:
- providing a hydrocarbon feed stream comprising at least one paraffin to a dehydrogenation unit comprising a moving bed reactor;
- contacting the feed stream with a catalyst in the reactor under dehydrogenation conditions;
- removing an effluent stream comprising at least one olefin from the reactor;
- and
- periodically removing between 10 wt % and 20 wt % of a total amount of the catalyst in the dehydrogenation unit every 60 to 120 days of operating time and replacing the removed catalyst with fresh catalyst while continuing to operate the reactor.
A process for dehydrogenation of a hydrocarbon feed comprising:
- providing a hydrocarbon feed stream comprising at least one paraffin to a dehydrogenation unit comprising a moving bed reactor;
- contacting the feed stream with a catalyst in the reactor under dehydrogenation conditions;
- removing an effluent stream comprising at least one olefin from the reactor;
- periodically removing a portion of the catalyst in the reactor and replacing the removed catalyst with fresh catalyst while continuing to operate the reactor;
- sensing one or more of a flow rate of the feed stream, or a flow rate of the effluent;
- transmitting one or more of the flow rate of the feed stream, or the flow rate of the effluent to a processor;
- analyzing one or more of the flow rate of the feed stream, or the flow rate of the effluent to determine an activity rate;
- analyzing the activity rate and a cost of the catalyst to determine at least one of an amount of catalyst to remove and replace, or a time to initiate removing and replacing the catalyst;
- and
- adjusting the portion of the catalyst removed and replaced to the determined amount of catalyst, or removing and replacing the catalyst at the determined time.
Dependencies are inferred from the claim text.