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US 10,525,409 B2Granted
Processes and systems for removing a vinyl iodide impurity from a recycle gas stream in the production of ethylene oxide
AssigneeShell Oil Company
InventorsMichael Francis Lemanski, Wayne Errol Evans
Life of this patent
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Abstract
Processes for reducing the amount of a gaseous iodide-containing impurity present in a recycle gas stream used in the production of ethylene oxide, in particular a vinyl iodide impurity, are provided. Processes for producing ethylene oxide, ethylene carbonate and/or ethylene glycol, and associated reaction systems are similarly provided.
Claims15
A process comprising:
- contacting at least a portion of a recycle gas stream comprising a vinyl iodide impurity with a guard bed material to yield a treated recycle gas stream, wherein the guard bed material comprises a support material, palladium and gold;
- and
- contacting an epoxidation feed gas comprising ethylene, oxygen and at least a portion of the treated recycle gas stream with an epoxidation catalyst to yield an epoxidation reaction product comprising ethylene oxide.
A reaction system for the production of ethylene carbonate and/or ethylene glycol comprising:
- a recycle gas loop fluidly connected to a source of ethylene and oxygen;
- an epoxidation reactor comprising an epoxidation catalyst, an inlet, and an outlet, wherein the inlet of the epoxidation reactor is fluidly connected to the recycle gas loop;
- an ethylene oxide absorber comprising an iodide-containing carboxylation catalyst, an inlet, and an outlet, wherein the outlet of the epoxidation reactor is fluidly connected to the inlet of the ethylene oxide absorber, the outlet of the ethylene oxide absorber is fluidly connected to the recycle gas loop, and the ethylene oxide absorber is configured to produce a recycle gas stream comprising a vinyl iodide impurity and a fat absorbent stream comprising ethylene carbonate and/or ethylene glycol;
- and
- a guard bed system comprising an inlet, an outlet, and one or more guard bed vessels comprising a guard bed material, wherein the guard bed material comprises a support material, palladium and gold, wherein the inlet and the outlet of the guard bed system is fluidly connected to the recycle gas loop, and the guard bed material is configured to remove at least a portion of the vinyl iodide impurity from at least a portion of the recycle gas stream.
2 more elements
Dependencies are inferred from the claim text.