US3789105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ammonia-hydrogen sulfide-cycle scrubbing method for crude coke oven gases
Assignee: Carl Still GmbH and Co KG
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Filing: 1971-11-10
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Granted: 1974-01-29
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Expires: 1991-11-10
Abstract
Abstract Continuous treating process for scrubbing ammonia rich coke oven gases containing H2S involves regenerating ammonia rich H2S wash liquor in a deacidifier and distilling the ammonia from the NH3 scrubber in a still. The cyclic process is carried out in two cycles: a first cycle in which regenerated, cooled, aqueous ammoniacal solution is circulated from the sump of the deacidifier to about the center or the upper parts of the H2Sscrubber, and from the sump of the H2S-scrubber back to the upper part of the deacidifier; and a second, hot cycle in which the regenerated aqueous ammoniacal solution issuing from the sump of the deacidifier is circulated to the upper part of the H2Sscrubber.
Inventors
- 👤 K Tippmer
- 👤 D Laufhutte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:15
CPC Classifications
C; C10; C10K; C10K1/00; C10K1/08; C10K1/10; C10K1/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
54 words
Continuous cyclic scrubbing process according to claim 1, wherein the wash water is charged to a plurality of different points in the H2S scrubber in the first regeneration cycle at temperatures of from about 18* to 25* C and in the second cycle, at a temperature of from about 40* to about 60* C.
Claim 2
Dependent Claim
24 words
Continuous cyclic scrubbing process according to claim 1, wherein cooling in the cycle is conducted internally over the upper part of the H2S scrubber.
Claim 3
Dependent Claim
37 words
Continuous cyclic scrubbing process according to claim 1, wherein the wash water of the second cycle is fortified by addition thereto of vapor condensates from the head of the still and from distillation of the NH3 portions.
Claim 4
Dependent Claim
51 words
Continuous cyclic scrubbing process according to claim 4, wherein the wash water of the second cycle is strengthened with a molar ratio of NH3/H2S of from about 10 to about 15 mol.mol in the first regeneration cycle, to a molar ratio of NH3/H2S of from about 40 to about 70 mol/mol.
Claim 5
Dependent Claim
43 words
Continuous process according to claim 1, wherein the so-heated regenerated aqueous ammoniacal wash water of the second cycle is charged to the H2S scrubber below the point at which the ammoniacal wash water is introduced into the H2S scrubber from the ammonia scrubber.
References Cited (Backward Citations)
US2878099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |