Continuous production of aluminium sulphate
Abstract
Abstract A CONTINUOUS PROCESS FOR THE PRODUCTION OF ALUMINIUM SULPHATE, EITHER AS ALUM CRYSTALS OR ALUM SOLUTIONS IN COMMERCIAL CONCENTRATIONS AT AMBIENT TEMPERATURE IN WHICH SULPHURIC ACID AT CONCENTATIONS OF 20100% AND DRY ALUMINA HYDRATE OR BAUXITE OR OTHER FORM ALUMINIUM HYDROXIDE, TOGETHER WITH DILUENT FEED WATER AS MAY BE REQUIRED DEPENDING UPON THE CONCENTRATION OF THE SULPHURIC ACID USED, ARE SEPARATELY FED TO THE INLET OF A MULTI-PASS HEAT-EXHANGE TUBULAR REACTOR, THE MIXTURE OF REACTANTS BEING AT A TEMPERATURE OF 70-120*C. WHEN FED INTO SAID REACTOR AND BEING RAPIDLY BROUGHT TO A TEMPERATURE OF 110-120*C. AFTER ENTERING SAID REACTOR AND BEING MAINTAINED AT A TEMPERATURE OF 110-120*C. IN TRAVERSING SAID REACTOR TO THE OUTLET.
Inventors
- 👤 George H Jennings
Bibliographic Details
Claims Analysis
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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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |