Patent US405229A successfully refreshed from Google Patents.
US3333019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfuric acid concentration
Assignee: Pullman Inc
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Filing: 1964-06-25
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Granted: 1967-07-25
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Expires: 1984-06-25
Abstract
No abstract record available.
Inventors
- 👤 Marvin F Nathan
- 👤 George C Grubb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:56
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/90; C01B17/905; C01B17/92; C07; C07C; C07C2/00; C07C2/54; C07C2/56; C07C2/58; C07C2/62; C07C2527/00; C07C2527/02; C07C2527/053; C07C2527/054; Y; Y10; Y10S; Y10S159/00; Y10S159/19; Y10S159/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A METHOD FOR CONCENTRATING SPENT SULFURIC ACID CONTAINING ORGNIC CONTAMINANTS FROM AN ALKYLATION RECTION WHICH COMPRISES: DILUTING THE SPENT, CONTAMINATED ACID WITH WATER VAPOR TO A CONCENTRATION OF FROM ABOUT 30 TO ABOUT 85 PERCENT BY WEIGHT ACID; REMOVING CONTAMINANTS FROM SAID DILUTED ACID; EVAPORATING WATER FROM THE RESULTING DILUTE, DECONTAMINATED ACID IN A FIRST VAPORIZATION ZONE UNDER A PRESSSURE OF FROM ABOUT 15MM. HG TO ABOUT 150 MM. HG; CONTACTING VAPORS FROM THE FIRST VAPORIZATION ZONE WITH CONTAMINATED SPENT ACID FOR ABSORPTION AND CONDENSATION OF THE VAPORS THEREIN TO DILUTE SAID SPENT ACID; PASSING THE SULFURIC ACID WHICH HAS BEEN CONSENTRATED IN THE FIRST VAPORIZATION ZONE TO A SECOND VAPORIZATION ZONE AND EVAPORATING WATER FROM THE ACID BY INCREMENTALLY INCRESING THE CONCENTRATION OF THE ACID UNDER VACUUM OF FROM ABOUT 0.5 MM. HG TO ABOUT 15 MM. HG; MIXING THE RESULTING VAPORS FROM SAID SECOND VAPORIZATION ZONE WITH SPENT ACID PRIOR TO DECONTAMINATION TO DILUTE SAID SPENT, CONTAMINATED ACID AND WITHDRAWING REGENERATED, DECONTAMINATED SULFURIC ACID FROM THE SECOND VAPORIZATION ZONE.
Claim 2
Independent Claim
171 words
A METHOD FOR CONCENTRATING SPENT SULFURIC ACID CONTAINING ORGNIC CONTAMINANTS FROM AN ALKYLATION RECTION WHICH COMPRISES: DILUTING THE SPENT, CONTAMINATED ACID WITH WATER VAPOR TO A CONCENTRATION OF FROM ABOUT 30 TO ABOUT 85 PERCENT BY WEIGHT ACID; REMOVING CONTAMINANTS FROM SAID DILUTED ACID; EVAPORATING WATER FROM THE RESULTING DILUTE, DECONTAMINATED ACID IN A FIRST VAPORIZATION ZONE UNDER A PRESSSURE OF FROM ABOUT 15MM. HG TO ABOUT 150 MM. HG; CONTACTING VAPORS FROM THE FIRST VAPORIZATION ZONE WITH CONTAMINATED SPENT ACID FOR ABSORPTION AND CONDENSATION OF THE VAPORS THEREIN TO DILUTE SAID SPENT ACID; PASSING THE SULFURIC ACID WHICH HAS BEEN CONSENTRATED IN THE FIRST VAPORIZATION ZONE TO A SECOND VAPORIZATION ZONE AND EVAPORATING WATER FROM THE ACID BY INCREMENTALLY INCRESING THE CONCENTRATION OF THE ACID UNDER VACUUM OF FROM ABOUT 0.5 MM. HG TO ABOUT 15 MM. HG; MIXING THE RESULTING VAPORS FROM SAID SECOND VAPORIZATION ZONE WITH SPENT ACID PRIOR TO DECONTAMINATION TO DILUTE SAID SPENT, CONTAMINATED ACID AND WITHDRAWING REGENERATED, DECONTAMINATED SULFURIC ACID FROM THE SECOND VAPORIZATION ZONE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-24 | 1971-01-23 | 1971-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-24 | 1975-01-23 | 1975-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-24 | 1979-01-23 | 1979-07-25 | $7700.00 | Window Closed / Lapsed |