US3596438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of carbonyl sulfide from industrial gases
Assignee: NL Chemicals Inc
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Filing: 1969-11-03
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Granted: 1971-08-03
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Expires: 1989-11-03
Abstract
Abstract The disclosure is of a practical, economical process for removing carbonyl sulfide from the gases generated in a commercial process for producing titanium tetrachloride by chlorinating ilmenite ores, and is carried out by first freeing the gases of titanium tetrachloride, hydrochloric acid and chlorine and then sending the remaining gases, which comprise mainly, C0, C02 N2 and COS, through a substantially dry static bed of activated carbon maintained at a relatively low temperature whereby the carbonyl sulfide is adsorbed on the activated carbon, the activated carbon then being regenerated for subsequent use by passing steam or an inert gas through the carbon bed at elevated temperatures followed by cooling; the invention being comprehensive also of a cyclic process wherein a series of four towers of activated carbon are used in a predetermined sequence for removing carbonyl sulfide from chlorinator gases continuously on a plant scale. For purposes of identification and brevity the term ''''sour'''' gas will be used to identify chlorinator gases which have been freed of TiC14, HC1 and C1 and comprise relatively large amounts of C02 plus C0, N2 and small amounts of COS, while the term ''''sweet'''' gas will be used to identify a sour gas from which the COS has been removed.
Inventors
- 👤 John Beukenkamp
- 👤 Carl Kirby Stoddard
- 👤 Joseph L Waldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:18
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; C; C01; C01B; C01B32/00; C01B32/30; C01B32/354; C01B32/36; C10; C10K; C10K1/00; C10K1/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
30 words
Process for removing carbonyl sulfide from industrial gases containing the same according to claim 1 wherein the regenerated column of activated carbon is cooled by passing cool sweet gas therethrough.
Claim 2
Dependent Claim
42 words
Process for removing carbonyl sulfide from industrial gases containing the same according to claim 1 wherein said industrial gas is cooled to a temperature at least as low as about 50* F. prior to being fed into said column of activated carbon.
Claim 3
Dependent Claim
35 words
Process for removing carbonyl sulfide from industrial gases containing the same according to claim 1 wherein the cooled industrial gases are passed through said column of activated carbon for from about 1.5 to 8.0 hours.
Claim 4
Dependent Claim
37 words
Process for removing carbonyl sulfide from industrial gases containing the same according to claim 1 wherein the activated carbon is regenerated by passing superheated steam through said column of activated carbon for from 4 to 16 hours.
Claim 5
Dependent Claim
31 words
Process for removing carbonyl sulfide from industrial gases containing the same according to claim 5 wherein the temperature of said superheated steam is in the range of 400* to 550* F.
Claim 6
Dependent Claim
49 words
Process for removing carbonyl sulfide from industrial gases containing the same according to claim 1 wherein the said industrial gases comprise from 39 to 42 percent carbon monoxide, from 50 to 55 percent carbon dioxide, from 5 to 6 percent nitrogen and from 0.4 to 0.5 percent carbonyl sulfide.
Claim 7
Dependent Claim
39 words
Process for removing carbonyl sulfide from industrial gases containing the same according to claim 1 wherein the ratio of the height of the column of actIvated carbon to its diameter is in the range of from 2:1 to 32:1.
Claim 8
Dependent Claim
177 words
Continuous process for removing carbonyl sulfide from industrial gases containing a large proportion of CO2, CO and N2 in addition to said carbonyl sulfide comprising the steps of: cooling said gases to a temperature as low as 30* F., feeding the cooled gases successively through each of a plurality of columns of activated carbon interconnected by pipe lines and valves, wherein the ratio of the height of each column of activated carbon to its diameter is at least 2:1, and at a flow rate at not less than 8.2 ft./sec., said cooled gases being fed to each one of said columns of activated carbon successively in accordance with a 4-phase cyclic program and each column of activated carbon serving, in turn, as a carbonyl sulfide adsorber, maintaining the temperature in each column of activated carbon, in the range of from 35* to 115* F. to adsorb the carbonyl sulfide on said activated carbon and recover a cool sweet gas comprising CO2, CO and N2, and regenerating and cooling each column of activated carbon following the adsorption cycle.
Claim 9
Dependent Claim
56 words
Continuous process for recovering carbonyl sulfide from industrial gases according to claim 9 wherein each column is regenerated, in turn, by passing superheated steam therethrough at a temperature from 400* to 550* F. and each regenerated column is cooled, in turn, by passing the cool sweet gas recovered from an adsorbtion tower through said regenerated column.
Claim 10
Dependent Claim
188 words
Continuous process for removing carbonyl sulfide from industrial gases according to claim 10 characterized by the following program; PROGRAM A Cycle Tower I Tower II Tower III Tower IV A Adsorbing Cooling Idling Steaming B Steaming Idling Adsorbing Cooling C Cooling Adsorbing Steaming Idling D Idling Steaming Cooling Adsorbing wherein said program is being maintained by manipulation of the valves in the pipe lines interconnecting said columns of activated carbon in accordance with the following valve settings: CYCLE VALVE NO./POSITIONS A 1/L 2/L 3/R 4/L 5/L 6/L 7/R 8/L 9/L 10/R 11/C 12/C 13/C 14/O 15/O 16/C 17/C 18/O 19/C 20/O B 1/R 2/R 3/L 4/R 5/R 6/L 7/R 8/R 9/R 10/L 11/O 12/C 13/C 14/C 15/O 16/C 17/O 18/C 19/C 20/O C 1/L 2/R 3/L 4/L 5/L 6/R 7/L 8/L 9/L 10/R 11/C 12/C 13/O 13/0 14/C 15/O 16/C 17/C 18/C 19/O 20/O D 1/R 2/L 3/R 4/R 5/R 6/R 7/L 8/R 9/R 10/L 11/C 12/O 13/C 14/C 15/O 16/O 17/C 18/C 19/C 20/O where L and R denote left and right settings of the valves O and C denote open and closed positions of the valves.
Claim 11
Dependent Claim
163 words
Continuous process for removing carbonyl sulfide from industrial waste gases according to claim 10 characterized by the following program; PROGRAM B Cycle Tower I Tower II Tower III Tower IV A Adsorbing Adsorbing Cooling Steaming B Steaming Adsorbing Adsorbing Cooling C Cooling Steaming Adsorbing Adsorbing D Adsorbing Cooling Steaming Adsorbing said program being maintained by manipulation of the valves in the pipe lines interconnecting said columns of activated carbon in accordance with the following valve settings: CYCLE VALVE NO./POSITION A 1/L 2/L 3/R 4/L 5/L 6/L 7/R 8/L 9/L 10/L 11/C 12/C 13/C 14/O 15/O 16/C 17/C 18/C 19/C 20/O B 1/L 2/R 3/L 4/R 5/R 6/L 7/R 8/R 9/R 10/L 11/O 12/C 13/C 14/C 15/O 16/C 17/C 18/C 19/C 20/O C 1/R 2/L 3/R 4/R 5/R 6/L 7/R 8/R 9/R 10/R 11/C 12/O 13/C 14/C 15/O 16/C 17/C 18/C 19/C 20/O D 1/R 2/L 3/R 4.L 5/L 6/R 7/L 8/L 9/L 10/R 11/C 12/C 13/O 14/C 15/O 16/C 17/C 18/C 19/C 20/O
References Cited (Backward Citations)
US3000988A
Cited
US3358421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |