Process for removal of carbon dioxide from mixtures containing carbon dioxide and methane
A process for the physical solvent absorptive distillation of a feed gas stream containing carbon dioxide, methane and heavier hydrocarbons to produce a methane-rich overhead product and a CO/sub 2/-rich bottom product is described comprising the steps of: (a) introducing a feed gas stream comprising carbon dioxide, methane and heavier hydrocarbons into an absorptive distillation zone at elevated pressure; (b) introducing a physical solvent in the amount of approximately 0.5-5 moles of solvent per mole of feed into the upper zone of the distillation zone to absorb CO/sub 2/ and heavier hydrocarbons from such feed gas stream; (c) withdrawing a methane-rich overhead stream from the distillation zone as a product without subjecting it to any overhead condenser-reflux duty; (d) removing heat from the distillation zone in at least one intermediate stage of the distillation zone between the point of entry of the physical solvent and the feed location; (e) removing and heating the CO/sub 2/ and heavier hydrocarbon-containing physical solvent at approximately the elevated pressure of the feed gas stream to separately recover at least a regenerated physical solvent for recycle to step (b) and a CO/sub 2/-rich bottom product.
- Assignee:
- Air Products and Chemicals, Inc., Allentown, PA
- Patent Number(s):
- US 4747858
- OSTI ID:
- 6962871
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
10 SYNTHETIC FUELS
ABSORPTION
ADSORPTION
ALKANES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
DISPERSIONS
DISTILLATION
EXTRACTION
HEAT EXTRACTION
HYDROCARBONS
METHANE
MIXTURES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PROCESS SOLUTIONS
PRODUCTION
REMOVAL
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION
SOLVENTS
SORPTION