US2716592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying sulfuric acid
Assignee: MW Kellogg Co
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Filing: 1952-09-23
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Granted: 1955-08-30
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Expires: 1972-09-23
Abstract
No abstract record available.
Inventors
- 👤 Joseph F Skelly
- 👤 Samuel R Stiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:50
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS OF PURIFYING SULFURIC ACID CONTAMINATED WITH AT LEAST ONE IMPURITY SELECTED FROM POLAR AND NONPOLAR IMPURITIES WHICH COMPRISES SUPPLYING FROM A SOURCE OTHER THAN SAID CONTAMINATED ACID A LOW VISCOSITY ORGANIC LIQUID WHICH IS CHEMICALLY INERT AND IMMISCIBLE WITH SULFURIC ACID TO A CRYSTALLIZATION ZONE TO FORM A LIQUID MEDIUM THEREIN, SUPPLYING THE CONTAMINATED ACID TO THE CRYSTALLIZATION ZONE, DISPERSING CONTAMINATED ACID INTO THE LIQUID MEDIUM IN THE CRYSTALLIZATION ZONE WHICH IS MAINTAINED AT A TEMPERATURE SUFFICIENT TO CRYSTALLIZE SULFURIC ACID, SEPARATING THE ACID CRYSTALS THUS FORMED FROM THE REMAINING LIQUID AND MELTING THE ACID CRYSTALS TO PRODUCE AN ACID OF IMPROVED PURITY.
Claim 2
Dependent Claim
105 words
A PROCESS OF PURIFYING SULFURIC ACID CONTAMINATED WITH AT LEAST ONE IMPURITY SELECTED FROM POLAR AND NONPOLAR IMPURITIES WHICH COMPRISES SUPPLYING FROM A SOURCE OTHER THAN SAID CONTAMINATED ACID A LOW VISCOSITY ORGANIC LIQUID WHICH IS CHEMICALLY INERT AND IMMISCIBLE WITH SULFURIC ACID TO A CRYSTALLIZATION ZONE TO FORM A LIQUID MEDIUM THEREIN, SUPPLYING THE CONTAMINATED ACID TO THE CRYSTALLIZATION ZONE, DISPERSING CONTAMINATED ACID INTO THE LIQUID MEDIUM IN THE CRYSTALLIZATION ZONE WHICH IS MAINTAINED AT A TEMPERATURE SUFFICIENT TO CRYSTALLIZE SULFURIC ACID, SEPARATING THE ACID CRYSTALS THUS FORMED FROM THE REMAINING LIQUID AND MELTING THE ACID CRYSTALS TO PRODUCE AN ACID OF IMPROVED PURITY.
References Cited (Backward Citations)
US2287732A
Cited
US2593128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-08-29 | 1959-02-28 | 1959-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-29 | 1963-02-28 | 1963-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-29 | 1967-02-28 | 1967-08-30 | $7700.00 | Window Closed / Lapsed |