Apparatus for the preparation of nitric acid
Abstract
Abstract THE OXIDATION OF AMMONIA PRODUCES PRODUCTS WHICH ARE COOLED BY THE GASEOUS EFFLUENT OF AN ABSORPTION-OXIDATION TOWER, ARE SUDDENLY CHILLED BELOW THE DEW POINT, PRODUCING WEAK HNO3 AND NO THE NO IS OXIDIZED TO NO2 AND MEDIUM HNO3, THE NO2 IS PUT INTO THE BASE OF THE COLUMN, THE MEDIUM HNO3 IS PUT INTO THE COLUMN THEREABOVE, AND THE WEAK HNO3 IS PUT INTO IT AT A HIGHER LEVEL. THE EFFLUENT USED IN COOLING THE PRODUCTS OF AMMONIA OXIDATION DRIVE A COMPRESSOR WHICH PROCUCES HOT AIR TO HEAT THE AMMONIA, MIXES WITH THE CONCENTRATED HNO3 FROM THE TOWER TO SWEEP OUT UNABSORBED GASES AND COLORING MATTER, AND IS INJECTED INTO THE OXIDATION OF NO GAS. THE ACID IS OVER 70% HNO3. THE PROCESS USES ALL WATER FORMED BY ITS REACTION IN THE ACID, ADDS ONLY ENOUGH WATER TO ATTAIN THE SELECTED CONCENTRATION, DISCHARGES NO WATER, OPERATES AT MEDIUM PRESSURE OF 3.5 TO 4.5 ATM. ABS. THE APPARATUS IS NOVEL. D R A W I N G
Inventors
- 👤 Jean-Marie Lerolle
- 👤 Serge Hardouin
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |