US3966633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste water processing
Assignee: Cogas Development Co
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Filing: 1974-09-23
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Granted: 1976-06-29
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Expires: 1994-09-23
Abstract
Abstract Waste water formed in the gasification of coal and containing ammonia, H 2 S, and phenolic compounds is treated to remove H 2 S and a substantial proportion of its ammonia, while leaving sufficient ammonia in the water to maintain a pH of at least 8 (such as up to about 10.5, preferably about 8.5 to 9), the ammoniacal water is then flashed into a stream of superheated steam being fed to gasification zone. At the high temperatures in the gasification zone the organic impurities are decomposed.
Inventors
- 👤 Louis D. Friedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:52
CPC Classifications
C; C10; C10J; C10J3/00; C10J3/46; C10J3/54; C01; C01B; C01B17/00; C01B17/16; C01B17/167; C01B3/00; C01B3/02; C01B3/22; C01B3/24; C01B3/28; C01C; C01C1/00; C01C1/02; C01C1/10; C10J3/48; C10J3/482; C10J3/58; C10J3/60; C10J3/62; C10K; C10K1/00; C10K1/002; C10K1/003; C10K1/004; C10K1/005; C10K1/08; C10K1/10; C10K1/101; C10K1/12; C10K1/122; C10K1/14; C10K1/143; C10K1/16; C10K3/00; C10K3/02; C10K3/04; C10G; C10G2300/00; C10G2300/10; C10G2300/1003; C10J2300/00; C10J2300/09; C10J2300/0913; C10J2300/093; C10J2300/0943; C10J2300/12; C10J2300/1215; C10J2300/16; C10J2300/1603; C10J2300/1615; C10J2300/164; C10J2300/1656; C10J2300/1662; C10J2300/169; C10J2300/1696
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
135 words
In a system of synthesis gas manufacture including a gasifier wherein fluidized char is reacted with steam using a particulate heat exchange material to sustain the endothermic steam-carbon reaction to produce a synthesis gas stream which on cooling gives water contaminated with H 2 S and NH 3 and a carbonizer wherein fluidized coal is carbonized below about 700°C to provide said char and vapors which on cooling give oil and water contaminated with H 2 S and NH 3 and organic materials, the improvement which comprises steam-stripping the contaminated waters to remove the H 2 S but retaining sufficient ammonia to keep the pH between about 8.5 to 10.5 and introducing the resulting treated water into the gasifier to provide at least a portion of the steam requirement therefor while consuming the organic materials.
Claim 2
Dependent Claim
135 words
In a system of synthesis gas manufacture including a gasifier wherein fluidized char is reacted with steam using a particulate heat exchange material to sustain the endothermic steam-carbon reaction to produce a synthesis gas stream which on cooling gives water contaminated with H 2 S and NH 3 and a carbonizer wherein fluidized coal is carbonized below about 700°C to provide said char and vapors which on cooling give oil and water contaminated with H 2 S and NH 3 and organic materials, the improvement which comprises steam-stripping the contaminated waters to remove the H 2 S but retaining sufficient ammonia to keep the pH between about 8.5 to 10.5 and introducing the resulting treated water into the gasifier to provide at least a portion of the steam requirement therefor while consuming the organic materials.
Claim 3
Dependent Claim
99 words
Process as in claim 1 in which said H 2 S is stripped off at a pressure of about 75 to 125 psig, said ammonia is stripped off at a pressure of about 175 to 230 psig, the ammoniacal water remaining after said ammonia stripping has a pH of about 8.5 to 10.5 and a temperature of at least about 200°C, said stream of superheated steam has a temperature of about 300° to 600°C and a pressure of about 150 to 550 psig, and substantially all of the resulting stream of steam is fed into the gasification zone directly.
References Cited (Backward Citations)
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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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |