US4013757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure thermal hydrolysis process to decompose triazines in acid waste streams
Assignee: Olin Corp
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Filing: 1975-04-17
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Granted: 1977-03-22
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Expires: 1995-04-17
Abstract
Abstract A high pressure thermal hydrolysis process is described which comprises heating acid waste streams resulting from the manufacture of cyanuric acid and chlorinated derivatives of cyanuric acid, containing cyanuric acid and amino-substituted cyanurates, in a pressure vessel, at a temperature of from about 225° to about 275° C, to effect decomposition of these materials into ammonia and carbon dioxide. This process provides an effective pollution control means, compatible with existing commercial facilities.
Inventors
- 👤 Sidney Berkowitz
- 👤 Charles V. Juelke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:51
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/02; C02F1/025
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
A process for treating an acid waste stream having a pH of from about 0 to about 6 and containing a triazine ring compound selected from the group consisting of cyanuric acid, melamine, ammeline and ammelide, to effect decomposition of said triazine ring compound into the decomposition products ammonia and carbon dioxide, which comprises heating said acid waste stream at a temperature of from about 225° to about 275° C under the autogenously developed pressure for a time of from about one to about 15 minutes, until decomposition of said triazine ring compound into said decomposition products is effected, and recovering a waste stream having no detectable amount of said triazine ring compound.
Claim 2
Dependent Claim
113 words
A process for treating an acid waste stream having a pH of from about 0 to about 6 and containing a triazine ring compound selected from the group consisting of cyanuric acid, melamine, ammeline and ammelide, to effect decomposition of said triazine ring compound into the decomposition products ammonia and carbon dioxide, which comprises heating said acid waste stream at a temperature of from about 225° to about 275° C under the autogenously developed pressure for a time of from about one to about 15 minutes, until decomposition of said triazine ring compound into said decomposition products is effected, and recovering a waste stream having no detectable amount of said triazine ring compound.
Claim 3
Dependent Claim
22 words
The process of claim 1, wherein the temperature selected for heating said waste streams is from about 245° to about 275° C.
Claim 4
Dependent Claim
26 words
The process of claim 1, wherein the time for heating said waste streams at the selected temperature is from about 1 minute to about 5 minutes.
References Cited (Backward Citations)
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US2768167A
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US3154545A
Cited
GB983591A
Cited
US3325493A
Cited
US3878208A
Cited
US3969352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |