Patent US2689871A successfully refreshed from Google Patents.
US2689871A
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Monochlorobenzene recovery from ddt waste acid
Assignee: EIDP Inc
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Filing: 1951-03-23
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Granted: 1954-09-21
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Expires: 1971-03-23
Abstract
No abstract record available.
Inventors
- 👤 Richard K Rathmell
- 👤 Francis C Zevnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:31
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/35; C07C17/38; C07C17/395; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
IN A PROCESS FOR THE RECOVERY OF MONOCHLOROBENZENE FROM A WASTE SULFURIC ACID CONTAINING MONOCHLOROBENZENE SULFONIC ACID, THE STEPS COMPRISING HEATING SAID WASTE ACID TO A TEMPERATURE ABOVE 160* C. BY RAPIDLY MIXING WITH SUPERHEATED STEAM, IMMEDIATELY SPRAYING THE MIXTURE INTO THE VAPOR SPACE OF A DISTILLATION ZONE WHICH CONTAINS A BODY OF AQUEOUS SULFURIC ACID MAINTAINED AT A TEMPERATURE ABOVE 180* C., WITHDRAWING A VAPORIZED MIXTURE OF MONOCHLOROBENZENE AND WATER FROM THE DISTILLATION ZONE, CONDENSING THE
Claim 2
Dependent Claim
77 words
IN A PROCESS FOR THE RECOVERY OF MONOCHLOROBENZENE FROM A WASTE SULFURIC ACID CONTAINING MONOCHLOROBENZENE SULFONIC ACID, THE STEPS COMPRISING HEATING SAID WASTE ACID TO A TEMPERATURE ABOVE 160* C. BY RAPIDLY MIXING WITH SUPERHEATED STEAM, IMMEDIATELY SPRAYING THE MIXTURE INTO THE VAPOR SPACE OF A DISTILLATION ZONE WHICH CONTAINS A BODY OF AQUEOUS SULFURIC ACID MAINTAINED AT A TEMPERATURE ABOVE 180* C., WITHDRAWING A VAPORIZED MIXTURE OF MONOCHLOROBENZENE AND WATER FROM THE DISTILLATION ZONE, CONDENSING THE
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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) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |