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US 10,646,862 B2Granted
Upgrading fuel gas using stoichiometric air for catalyst regeneration
AssigneeExxonMobil Research and Engineering Company
InventorsSuriyanarayanan Rajagopalan, Mohsen N. Harandi
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Abstract
Systems and methods are provided for catalyst regeneration using a stoichiometric amount or less air for coke combustion.
Claims16
A method of upgrading a fuel gas comprising:
- contacting a fuel gas comprising C5- hydrocarbons with a catalyst in a fluidized bed reactor to upgrade the fuel gas to gasoline boiling range C5—C12 hydrocarbons;
- gravity-feeding a portion of the catalyst from the fluidized bed reactor to a regeneration zone by opening a first pair of block valves on a reactor drain line;
- closing the first pair of block valves on the reactor drain line and opening a first bleed valve positioned between the first pair of block valves on the reactor drain line;
- purging the regeneration zone to remove hydrocarbons that are entrained on the portion of the catalyst;
- exposing the portion of the catalyst to oxygen to regenerate the portion of the catalyst while the portion of the catalyst is in the regeneration zone;
- purging the regeneration zone to remove oxygen that is entrained in the portion of the catalyst that has been regenerated;
- pressurizing the regeneration zone with the fuel gas;
- and
- feeding the portion of the catalyst that has been regenerated to the fluidized bed reactor by opening a second pair of block valves in a drain line from the regeneration zone.
6 more elements
A system for upgrading a fuel gas comprising:
- a fluidized bed reactor receiving a fuel gas feed and containing a catalyst suitable for converting the fuel gas to gasoline boiling range hydrocarbons;
- a regenerator for regenerating the catalyst;
- a reactor drain line fluidly connected to the fluidized bed reactor and the regenerator having a first end proximal an outlet of the fluidized bed reactor and a second end proximal an inlet of the regenerator, wherein the first end is higher than the second end, and wherein the catalyst is drained by gravity from the fluidized bed reactor into the regenerator via the reactor drain line;
- a first pair of block valves on the reactor drain line;
- a first bleed valve on the reactor drain line between the first pair of block valves;
- a regenerator drain line fluidly connected to the regenerator and the fluidized bed reactor having a first end proximal an outlet of the regenerator and a second end proximal an inlet of the fluidized bed reactor, wherein the first end is higher than the second end;
- and
- a second pair of block valves on the regenerator drain line.
5 more elements
Dependencies are inferred from the claim text.