US4336233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of CO2 and/or H2 S and/or COS from gases containing these constituents
Assignee: BASF SE
•
Filing: 1980-08-13
•
Granted: 1982-06-22
•
Expires: 2000-08-13
Abstract
Abstract An aqueous solution containing from 0.81 to 1.3 moles of piperazine per liter is used as a washing agent for removing impurities such as H2S, CO2 and COS from gases. Piperazine can also be used, in amounts of up to 0.8 mole per liter, together with physical or chemical solvents, to accelerate the absorption of H2S, CO2 and COS. The washing process is used for natural gases, coke-oven gases, gases from the gasification of coal and synthesis gases, of any origin.
Inventors
- 👤 Max Appl
- 👤 Ulrich Wagner
- 👤 Hans J. Henrici
- 👤 Klaus Kuessner
- 👤 Klaus Volkamer
- 👤 Ernst Fuerst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:30
CPC Classifications
C; C10; C10K; C10K1/00; C10K1/08; C10K1/10; C10K1/12; C10K1/14; C10K1/143; B; B01; B01D; B01D53/00; B01D53/14; B01D53/1493; Y; Y02; Y02C; Y02C20/00; Y02C20/40; Y02P; Y02P20/00; Y02P20/151
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
In a process for removing CO 2 , H 2 S or both as constituents from gases by washing the gases with an aqueous solution of a scrubbing liquid and subsequently regenerating the scrubbing liquid, the improvement which comprises: using a scrubbing liquid which contains (a) from about 0.05 to 0.8 mole/l of piperazine as an absorption accelerator and (b) from about 1.5 to 4.5 moles/l of methyldiethanolamine, and carrying out the washing of the gases with the scrubbing liquid at temperatures of from about 40° C. upward.
Claim 2
Dependent Claim
88 words
In a process for removing CO 2 , H 2 S or both as constituents from gases by washing the gases with an aqueous solution of a scrubbing liquid and subsequently regenerating the scrubbing liquid, the improvement which comprises: using a scrubbing liquid which contains (a) from about 0.05 to 0.8 mole/l of piperazine as an absorption accelerator and (b) from about 1.5 to 4.5 moles/l of methyldiethanolamine, and carrying out the washing of the gases with the scrubbing liquid at temperatures of from about 40° C. upward.
Claim 3
Dependent Claim
15 words
A process as set forth in claim 1 wherein the scrubbing liquid contains tertiary alkylalkanolamines.
Claim 4
Dependent Claim
15 words
A process as set forth in claim 1, wherein gases additionally containing COS are washed.
Claim 5
Dependent Claim
58 words
A process as set forth in claim 1, wherein synthesis gases obtained by partial oxidation and additionally containing COS as impurity are washed by fitting an auxiliary vessel between the preheater and the top of the stripping column, the temperature in the vessel being up to 20° C. below the temperature at the bottom of said stripping column.
Claim 6
Dependent Claim
30 words
A process as set forth in claim 1, wherein the washing of the gases with the scrubbing liquid is carried out at temperatures of from about 40° to 120° C.
Claim 7
Dependent Claim
19 words
A process as set forth in claim 1, wherein scrubbing liquid contains from 0.05 to 0.4 mole/l of piperazine.
Claim 8
Dependent Claim
98 words
In a process for removing CO 2 , H 2 S or both as constituents from gases (a) by washing the gases with an aqueous solution of methyldiethanolamine as scrubbing liquid, (b) subsequently regenerating the scrubbing liquid and (c) recirculating the scrubbing liquid to the washing step (a), the improvement which comprises: using a scrubbing liquid which contains (d) from about 1.5 to 4.5 moles/l of methyldiethanolamine to which (e) from about 0.05 to 0.8 mole/l of piperazine is added, and (f) washing the gases with the scrubbing liquid at a temperature of from about 40° C. upward.
Claim 9
Dependent Claim
98 words
In a process for removing CO 2 , H 2 S or both as constituents from gases (a) by washing the gases with an aqueous solution of methyldiethanolamine as scrubbing liquid, (b) subsequently regenerating the scrubbing liquid and (c) recirculating the scrubbing liquid to the washing step (a), the improvement which comprises: using a scrubbing liquid which contains (d) from about 1.5 to 4.5 moles/l of methyldiethanolamine to which (e) from about 0.05 to 0.8 mole/l of piperazine is added, and (f) washing the gases with the scrubbing liquid at a temperature of from about 40° C. upward.
Claim 10
Dependent Claim
31 words
A process as set forth in claim 7, wherein the washing of the gases with the scrubbing liquid takes place at a temperature of from about 40° C. to 120° C.
Claim 11
Dependent Claim
20 words
A process as set forth in claim 7, wherein the scrubbing liquid contains from 0.05 to 0.4 mole/l of piperazine.
References Cited (Backward Citations)
US1783901A
Cited
US1951992A
Cited
US3071433A
Cited
US3653810A
Cited
US3965244A
Cited
US3989811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |