US3895100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of chlorine dioxide
Assignee: Erco Industries Ltd
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Filing: 1973-07-05
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Granted: 1975-07-15
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Expires: 1993-07-05
Abstract
Abstract A chlorine dioxide-producing process and apparatus therefor are provided in which water vapour is used to dilute and remove the chlorine dioxide from the reaction vessel. A cyclic arrangement is provided in which the recycle liquid heated to the boiling point of the reaction medium in the generator is allowed to expand gradually to provide a vapour/liquid/solid mixture which is discharged at low velocity to the generator. Vibration due to boiling is considerably reduced and wear of generator walls due to impinging materials is eliminated.
Inventors
- 👤 Gerald Cowley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:37
CPC Classifications
C; C01; C01B; C01B11/00; C01B11/02; C01B11/022; C01B11/023; C01B11/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
150 words
A CONTINUOUS METHOD OF PRODUCING CHLORINE DIOXIDE WHICH COMPRISES CONTINUOUSLY MAINTAINING A CHLORINE DIOXIDEPRODUCING REACTION MEDIUM IN A REACTION ZONE, THE REACTION MEDIUM CONTAINING AN ALKALI METAL CHLORATE, A REDUCING AGENT CAPABLE OF REDUCING SAID ALKALI METAL CHLORATE TO CHLORINE DIOXIDE AND CHLORINE AND A STRONG MINERAL ACID, CONTINUOUSLY GENERATING CHLORINE DIOXIDE AND CHLORINE FROM SAID REACTION MEDIUM AND CONTINUOUSLY EVAPORATING WATER FROM SAID REACTION MEDIUM AT SUBSTANTIALLY THE BOILING POINT THEREOF WHILE THE REACTION MEDIUM IS MAINTAINED UNDER A REDUCED PRESSURE CONTINUOUSLY REMOVING FROM SAID RAECTION ZONE A GASEOUS MIXTURE CONSISTING OF SAID GENERATED CHLORINE DIOXIDE AND CHLORINE AND SAID EVAPORATED WATER, CONTINUOUSLY RECOVERING CHLORINE DIOXIDE FROM SAID GASEOUS MIXTURE, CONTINUOUSLY DEPOSITING IN SAID REACTION ZONE AN ALKALI METAL SALT OF THE ANION OF SAID STRONG ACID, CONTINUOUSLY REMOVING FROM SAID REACTION ZONE A SLURRY CONTAINING DEPOSITED ALKALI METAL SALT AND PART OF SAID REACTION MEDIUM, CONTINUOUSLY FORMING A
Claim 2
Dependent Claim
150 words
A CONTINUOUS METHOD OF PRODUCING CHLORINE DIOXIDE WHICH COMPRISES CONTINUOUSLY MAINTAINING A CHLORINE DIOXIDEPRODUCING REACTION MEDIUM IN A REACTION ZONE, THE REACTION MEDIUM CONTAINING AN ALKALI METAL CHLORATE, A REDUCING AGENT CAPABLE OF REDUCING SAID ALKALI METAL CHLORATE TO CHLORINE DIOXIDE AND CHLORINE AND A STRONG MINERAL ACID, CONTINUOUSLY GENERATING CHLORINE DIOXIDE AND CHLORINE FROM SAID REACTION MEDIUM AND CONTINUOUSLY EVAPORATING WATER FROM SAID REACTION MEDIUM AT SUBSTANTIALLY THE BOILING POINT THEREOF WHILE THE REACTION MEDIUM IS MAINTAINED UNDER A REDUCED PRESSURE CONTINUOUSLY REMOVING FROM SAID RAECTION ZONE A GASEOUS MIXTURE CONSISTING OF SAID GENERATED CHLORINE DIOXIDE AND CHLORINE AND SAID EVAPORATED WATER, CONTINUOUSLY RECOVERING CHLORINE DIOXIDE FROM SAID GASEOUS MIXTURE, CONTINUOUSLY DEPOSITING IN SAID REACTION ZONE AN ALKALI METAL SALT OF THE ANION OF SAID STRONG ACID, CONTINUOUSLY REMOVING FROM SAID REACTION ZONE A SLURRY CONTAINING DEPOSITED ALKALI METAL SALT AND PART OF SAID REACTION MEDIUM, CONTINUOUSLY FORMING A
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said alkali metal chlorate is sodium chloRate.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein said reaction medium contains sodium chlorate, sodium chloride and sulphuric acid.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein said reaction medium contains sodium chlorate, hydrochloric acid and sulphuric acid.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein said reaction medium contains sodium chlorate and hydrochloric acid.
Claim 7
Dependent Claim
25 words
The method of claim 1 wherein said strong mineral acid is sulphuric acid and is added to said accelerated heated liquid in substantially concentrated form.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |