Process for removing carbonyl sulfide from hydrocarbon feedstreams
This patent describes a process for removing carbon dioxide, hydrogen sulfide and carbonyl sulfide from a feedstream containing carbon dioxide, hydrogen sulfide and carbonyl sulfide and hydrocarbons. It comprises: contacting the feedstream in a hydrolysis zone with a first portion of a lean solution stream comprising an aqueous alkaline solution at an effective hydrolysis temperature to convert at least a portion of the carbonyl sulfide to carbon dioxide and hydrogen sulfide, withdrawing a first effluent stream containing a reduced concentration of carbonyl sulfide relative to the feedstream, and withdrawing a first rich solution stream comprising the aqueous alkaline solution, carbon dioxide and hydrogen sulfide; contacting the first effluent stream in an absorption zone with a second portion of the lean solution stream at an effective absorption temperature to absorb carbon dioxide and hydrogen sulfide, and withdrawing a second rich solution stream comprising the aqueous alkaline solution, carbon dioxide and hydrogen sulfide; combining at least a portion of the first rich solution stream and the second rich solution stream and contacting the combined rich solution stream in a regeneration zone at effective conditions to desorb carbon dioxide and hydrogen sulfide, withdrawing a vent gas stream comprising carbon dioxide and hydrogen sulfide, and withdrawing the lean solution stream; separating the lean solution stream into the first and second portions; and recycling the first portion of the lean solution stream to the hydrolysis zone and the second portion of the lean solution stream to the absorption zone.
- Assignee:
- UOP, Des Plaines, IL (United States)
- Patent Number(s):
- A; US 5104630
- Application Number:
- PPN: US 7-611565
- OSTI ID:
- 5157290
- Country of Publication:
- United States
- Language:
- English
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320305 -- Energy Conservation
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONYLS
CHALCOGENIDES
CHEMICAL FEEDSTOCKS
CHEMICAL REACTIONS
CHEMICAL WASTES
DECOMPOSITION
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
HYDROLYSIS
INDUSTRIAL PLANTS
LYSIS
MANAGEMENT
MATERIALS
MATERIALS RECOVERY
NONRADIOACTIVE WASTES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM REFINERIES
PROCESSING
RAW MATERIALS
RECYCLING
SEPARATION PROCESSES
SOLVOLYSIS
SULFIDES
SULFUR COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES