US4529411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
CO2 Removal from high CO2 content hydrocarbon containing streams
Assignee: BP Corp North America Inc
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Filing: 1984-04-30
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Granted: 1985-07-16
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Expires: 2004-04-30
Abstract
Abstract Carbon dioxide is removed from CO 2 and hydrocarbon containing gaseous streams. In the instance where the hydrocarbons and CO 2 are such that hydrocarbons would condense out during CO 2 removal, the gas stream is treated in one or more stages to accomplish hydrocarbon composition control.
Inventors
- 👤 Clifton S. Goddin, Jr.
- 👤 Edward A. Turek
- 👤 Boyd A. George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:50
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1456; B01D53/1462; B01D53/1412; B01D53/1431; B01D53/1443; Y; Y02; Y02C; Y02C20/00; Y02C20/40; Y10; Y10S; Y10S62/00; Y10S62/928; Y10S62/929
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
221 words
Process for treating a gaseous stream comprising: (a) separating a first portion of predominantly higher (C 3 and heavier) hydrocarbons from a gaseous stream such that hydrocarbon condensation does not occur from the resulting stream comprising CO 2 and at least C 1 and C 2 hydrocarbons during CO 2 removal during Step (b) hereinafter set forth, the gaseous stream comprising CO 2 and hydrocarbons including at least C 1 and C 2 hydrocarbons, and further including C 3 and heavier hydrocarbons such that hydrocarbon condensation occurs during removal of CO 2 unless the gaseous stream is treated prior to CO 2 removal to remove said first portion of the hydrocarbons; then (b) introducing said resulting stream comprising CO 2 and at least C 1 and C 2 hydrocarbons into a permeation zone and separating a first portion of CO 2 from said resulting stream in the permeation zone by selective permeation of CO 2 across a differentially permeable membrane to produce a CO 2 permeate stream and a hydrocarbon enriched first stream comprising C 1 and C 2 hydrocarbons; and (c) further separating CO 2 from the hydrocarbon enriched first stream in at least one CO 2 removal zone by cryogenically fractionating the hydrocarbon enriched first stream to produce at least a C 1 stream and a CO 2 stream.
Claim 2
Dependent Claim
221 words
Process for treating a gaseous stream comprising: (a) separating a first portion of predominantly higher (C 3 and heavier) hydrocarbons from a gaseous stream such that hydrocarbon condensation does not occur from the resulting stream comprising CO 2 and at least C 1 and C 2 hydrocarbons during CO 2 removal during Step (b) hereinafter set forth, the gaseous stream comprising CO 2 and hydrocarbons including at least C 1 and C 2 hydrocarbons, and further including C 3 and heavier hydrocarbons such that hydrocarbon condensation occurs during removal of CO 2 unless the gaseous stream is treated prior to CO 2 removal to remove said first portion of the hydrocarbons; then (b) introducing said resulting stream comprising CO 2 and at least C 1 and C 2 hydrocarbons into a permeation zone and separating a first portion of CO 2 from said resulting stream in the permeation zone by selective permeation of CO 2 across a differentially permeable membrane to produce a CO 2 permeate stream and a hydrocarbon enriched first stream comprising C 1 and C 2 hydrocarbons; and (c) further separating CO 2 from the hydrocarbon enriched first stream in at least one CO 2 removal zone by cryogenically fractionating the hydrocarbon enriched first stream to produce at least a C 1 stream and a CO 2 stream.
Claim 3
Dependent Claim
20 words
Process as in claim 1 wherein the gaseous stream comprises in excess of about 30 mol % CO 2 .
Claim 4
Dependent Claim
47 words
Process as in claim 2 wherein the separating of Step (a) of claim 1 is by chilling the gaseous stream to a temperature such that the hydrocarbon dewpoint temperature profile during permeation is less than the temperature of the hydrocarbon enriched first stream produced in Step (b).
Claim 5
Dependent Claim
38 words
Process as in claim 3 wherein the gaseous stream is chilled to a temperature such that the hydrocarbon dewpoint temperature profile is at least 10° F. less than the temperature of the thus produced hydrocarbon enriched first stream.
Claim 6
Dependent Claim
123 words
Process as in claim 2 comprising chilling the gaseous stream to separate said portion of hydrocarbons from the gaseous stream to produce a chilled gaseous second stream; heating the thus chilled gaseous second stream to a temperature effective for maintaining the hydrocarbon dewpoint temperature profile during CO 2 removal in a permeation zone such that hydrocarbon condensation does not occur during CO 2 removal in said permeation zone; separating a first portion of CO 2 from the thus heated gaseous second stream in a permeation zone by selective permeation of CO 2 across a differentially permeable membrane to produce a CO 2 permeate stream and a hydrocarbon enriched first stream; and chilling the hydrocarbon enriched first stream to a temperature effective for cryodemethanizing.
Claim 7
Dependent Claim
23 words
Process as in claim 5 wherein the chilled gaseous second stream is heated in heat exchange relation with the hydrocarbon enriched second stream.
Claim 8
Dependent Claim
28 words
Process as in claim 1 wherein the gaseous stream comprises in the range of about 30 mol % CO 2 to about 95 mol % CO 2 .
Claim 9
Dependent Claim
28 words
Process as in claim 1 wherein the gaseous stream comprises in the range of about 30 mol % CO 2 to about 60 mol % CO 2 .
Claim 10
Dependent Claim
44 words
Process as in claim 1 wherein the gaseous stream is a gaseous stream from a CO 2 miscible flood produced reservoir and is characterized by containing greater than about 30 mol % CO 2 and by a variable C 3 and heavier hydrocarbon composition.
Claim 11
Dependent Claim
42 words
Process as in claim 1 wherein the gaseous stream is further characterized by a generally increasing C 4 and heavier hydrocarbon fraction as a function of increased CO 2 content in the gaseous stream from the CO 2 miscible flood produced reservoir.
Claim 12
Dependent Claim
33 words
Process as in claim 1 comprising: introducing the hydrocarbon enriched first stream into a cryodemethanizer column and separating C 1 hydrocarbon from CO 2 and other components of the hydrocarbon enriched first stream.
Claim 13
Dependent Claim
31 words
Process as in claim 11, further comprising: introducing a stream comprising hydrocarbons removed from the gaseous stream during Step (a) of claim 1 at an intermediate level into the cryodemethanizer column.
Claim 14
Dependent Claim
142 words
Process as in claim 11 comprising: chilling the gaseous stream to separate said first portion of hydrocarbons from the gaseous stream to produce a chilled gaseous second stream; heating the thus chilled gaseous second stream to a temperature effective for maintaining the hydrocarbon dewpoint temperature profile during CO 2 removal in the permeation zone such that hydrocarbon condensation does not occur during CO 2 removal in the permeation zone; separating a first portion of CO 2 from the thus heated gaseous second stream in the permeation zone by selective permeation of CO 2 across a differentially permeable membrane to produce a CO 2 permeate stream and a hydrocarbon enriched first stream; chilling the hydrocarbon enriched first stream to a temperature effective for cryodemethanizing; and cryogenically fractionating the hydrocarbon enriched first stream to produce a C 1 stream and a CO 2 stream.
Claim 15
Dependent Claim
31 words
Process as in claim 13 further comprising: introducing a stream comprising hydrocarbons removed from the gaseous stream during Step (a) of claim 1 at an intermediate level into the cryodemethanizer column.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |