US4183903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing carbon dioxide from gases utilizing an alkaline absorption solution containing a cyclic urea anti-foaming agent
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1978-08-02
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Granted: 1980-01-15
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Expires: 1998-08-02
Abstract
Abstract Antifoaming agents for use in acid gas scrubbing processes comprising 1-secondary or 1-tertiaryalkyl- or 1-cycloalkyl-hexahydro-2-pyrimidinones and 1-secondary or 1-tertiary alkyl- or 1-cycloaklyl-2-imidazolidinones are disclosed.
Inventors
- 👤 Michael T. Melchior
- 👤 George E. Milliman
- 👤 Guido Sartori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:12
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1493; Y; Y02; Y02C; Y02C20/00; Y02C20/40
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
117 words
A process for the removal of CO 2 from a gaseous stream containing CO 2 which comprises contacting said gaseous stream (1) in an absorption step with an aqueous absorbing solution comprising an alkaline material selected from the group consisting of alkali metal salts, alkali metal hydroxides and amines and (2) in a desorption and regeneration step desorbing at least a portion of the absorbed CO 2 from said absorbing solution, the improvement which comprises including in said aqueous absorbing solution an antifoaming agent comprising a cyclic urea represented by the general formula: ##STR5## wherein R is a secondary or tertiary alkyl or cycloalkyl or substituted cycloalkyl radical having from 4-20 carbon atoms and n is 0-2.
Claim 2
Dependent Claim
117 words
A process for the removal of CO 2 from a gaseous stream containing CO 2 which comprises contacting said gaseous stream (1) in an absorption step with an aqueous absorbing solution comprising an alkaline material selected from the group consisting of alkali metal salts, alkali metal hydroxides and amines and (2) in a desorption and regeneration step desorbing at least a portion of the absorbed CO 2 from said absorbing solution, the improvement which comprises including in said aqueous absorbing solution an antifoaming agent comprising a cyclic urea represented by the general formula: ##STR5## wherein R is a secondary or tertiary alkyl or cycloalkyl or substituted cycloalkyl radical having from 4-20 carbon atoms and n is 0-2.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein R is selected from the group consisting of sec. butyl-, sec. pentyl-, t-butyl-, t-pentyl-, t-hexyl-, cyclopentyl-, cyclohexyl-, cycloheptyl-, and alkyl-substituted cyclohexyl and cycloheptyl radicals.
Claim 4
Dependent Claim
9 words
The process of claim 1 wherein n is 1.
Claim 5
Dependent Claim
9 words
The process of claim 1 wherein R is cyclohexyl.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the antifoaming agent is represented by the formula: ##STR6##
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein the alkaline material is comprised of potassium carbonate and an amine activator.
Claim 8
Dependent Claim
14 words
The process of claim 6 wherein the amine activator is a sterically hindered amine.
Claim 9
Dependent Claim
13 words
The process of claim 7 wherein the sterically hindered amine is a diamine.
Claim 10
Dependent Claim
20 words
The process of claim 8 wherein the diamine is selected from the group consisting of N-cyclohexyl-1,2-ethanediamine, N-cyclohexyl-1,3-propanediamine, N-cyclohexyl-1,4-butanediamine, and N-cyclohexyl-1,5-pentanediamine.
Claim 11
Dependent Claim
23 words
The process of claim 8 wherein the diamine is N-cyclohexyl-1,3-propanediamine and the absorbing solution additionally contains an aminoacid cosolvent containing 4-8 carbon atoms.
Claim 12
Dependent Claim
11 words
The process of claim 10 wherein the cosolvent is pipecolinic acid.
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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) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |