Carbon dioxide hydrocarbons separation process

Patent · Tue Mar 18 04:00:00 EST 1986

OSTI ID:5601438

Netzer, D; Huebel, R R

A process is described for the separation and recovery of CO/sub 2/ from an enhanced oil recovery or naturally occurring gas stream containing a mixture of at least 45 mol % CO/sub 2/ and less than 0.2 mol % H/sub 2/S with light hydrocarbons containing ethane as a primary light hydrocarbon component. The process consists of: (a) providing a gas stream of the mixture at a pressure of at least 500 psia, (b) introducing the gas stream into the lower portion of an absorption system, (c) introducing a first liquid water phase containing at least 65 mol % water and containing less than about 1.4 weight % CO/sub 2/ into the top portion of the absorption system and a second liquid water phase containing at least 65 mol % water and containing between about 1.4 and 3.0 weight % CO/sub 2/ into the middle portion of the absorption system to form a downwardly flowing liquid water phase whereby the gas stream flows upwardly in contact with the downwardly flowing liquid water phase and the downwardly flowing liquid water phase absorbs CO/sub 2/ from the gas stream to form a CO/sub 2/-rich liquid water phase, (d) withdrawing the gas stream depleted in CO/sub 2/ from the top portion of the absorption system, (e) withdrawing the CO/sub 2/-rich liquid water phase from the bottom portion of the absorption system at a pressure of at least 500 psia, (f) separating gaseous CO/sub 2/ from the withdrawn CO/sub 2/-rich liquid water phase to form the recovered CO/sub 2/ and the first liquid water phase containing less than 1.4 mol % CO/sub 2/ and the second liquid water phase containing between about 1.4 and 3.0 weight % CO/sub 2/, and (g) recycling the separated first and second liquid water phases to the top and middle portions of the absorption system respectively.

• Assignee: Randall Corp., Houston, TX
• Patent Number(s): US 4576615
• OSTI ID: 5601438
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ABSORPTION
ALKANES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON DIOXIDE INJECTION
CARBON OXIDES
CHALCOGENIDES
DISPERSIONS
ENERGY SOURCES
ENHANCED RECOVERY
ETHANE
FLUID FLOW
FLUID INJECTION
FOSSIL FUELS
FUELS
GAS FLOW
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
MEDIUM PRESSURE
MISCIBLE-PHASE DISPLACEMENT
MIXTURES
OIL WELLS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
QUANTITY RATIO
RECOVERY
RECYCLING
SEPARATION PROCESSES
STIMULATION
SULFIDES
SULFUR COMPOUNDS
WATER
WELL STIMULATION
WELLS