CA2166077A1 - Electrochemical Process - Google Patents
Electrochemical ProcessInfo
- Publication number
- CA2166077A1 CA2166077A1 CA2166077A CA2166077A CA2166077A1 CA 2166077 A1 CA2166077 A1 CA 2166077A1 CA 2166077 A CA2166077 A CA 2166077A CA 2166077 A CA2166077 A CA 2166077A CA 2166077 A1 CA2166077 A1 CA 2166077A1
- Authority
- CA
- Canada
- Prior art keywords
- reaction medium
- chlorate
- alkali metal
- electrochemical cell
- sulfate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title abstract 3
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical compound [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 abstract 9
- 239000012429 reaction media Substances 0.000 abstract 7
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 abstract 6
- 239000004155 Chlorine dioxide Substances 0.000 abstract 3
- -1 alkali metal chlorate Chemical class 0.000 abstract 3
- 239000007864 aqueous solution Substances 0.000 abstract 3
- 235000019398 chlorine dioxide Nutrition 0.000 abstract 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract 2
- 229910052783 alkali metal Inorganic materials 0.000 abstract 2
- 229910052936 alkali metal sulfate Inorganic materials 0.000 abstract 2
- 230000002378 acidificating effect Effects 0.000 abstract 1
- 229910001413 alkali metal ion Inorganic materials 0.000 abstract 1
- 238000002425 crystallisation Methods 0.000 abstract 1
- 230000008025 crystallization Effects 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B11/00—Oxides or oxyacids of halogens; Salts thereof
- C01B11/02—Oxides of chlorine
- C01B11/022—Chlorine dioxide (ClO2)
- C01B11/023—Preparation from chlorites or chlorates
- C01B11/026—Preparation from chlorites or chlorates from chlorate ions in the presence of a peroxidic compound, e.g. hydrogen peroxide, ozone, peroxysulfates
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Hybrid Cells (AREA)
Abstract
The invention relates to a method of producing an acidified aqueous solution containing alkali metal sulfate and chlorate comprising the steps of introducing and aqueous solution containing alkali metal sulfate and chlorate into an electrochemical cell and electrochemically increasing the acidity of said aqueous solution, wherein the current efficiency of the cell is maintained below 70%. The invention also relates to a method of producing chlorine dioxide comprising the steps: providing a reactor with an aqueous acidic reaction medium containing alkali metal chlorate and sulfate; reducing chlorate ions in said reaction medium to form chlorine dioxide; withdrawing chlorine dioxide gas from the reaction medium; withdrawing reaction medium from the reactor and transferring it to an electrochemical cell substantially without crystallization of sulfate or chlorate; electrochemically acidifying said reaction medium to increase the acidity and to decrease the content of alkali metal ions; recycling acidified reaction medium to the reactor; adding make up alkali metal chlorate to the reaction medium before or after the electrochemical cell; wherein the current efficiency of the electrochemical cell is maintained below about 80 %.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9302279-6 | 1993-07-02 | ||
| SE9302279A SE9302279L (en) | 1993-02-26 | 1993-07-02 | Methods of producing chlorine dioxide |
| PCT/SE1994/000651 WO1995001466A1 (en) | 1993-07-02 | 1994-06-30 | Electrochemical process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2166077A1 true CA2166077A1 (en) | 1995-01-12 |
| CA2166077C CA2166077C (en) | 2000-06-27 |
Family
ID=20390490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002166077A Expired - Lifetime CA2166077C (en) | 1993-07-02 | 1994-06-30 | Electrochemical process |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU7134894A (en) |
| CA (1) | CA2166077C (en) |
| NZ (1) | NZ268446A (en) |
| WO (1) | WO1995001466A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5709713A (en) * | 1995-03-31 | 1998-01-20 | Cardiovascular Concepts, Inc. | Radially expansible vascular prosthesis having reversible and other locking structures |
| KR20010078864A (en) * | 2001-05-02 | 2001-08-22 | 원병희 | Ultra-Low Power Converters Without Transformers |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4129484A (en) * | 1976-05-11 | 1978-12-12 | Kemanord Ab | Process for regeneration of spent reaction solutions |
| US4806215A (en) * | 1988-07-27 | 1989-02-21 | Tenneco Canada Inc. | Combined process for production of chlorine dioxide and sodium hydroxide |
| WO1991018830A1 (en) * | 1990-06-07 | 1991-12-12 | Sterling Canada, Inc. | Electrochemical production of acid chlorate solutions |
| CA2023733C (en) * | 1990-08-21 | 1998-04-14 | Marek Lipsztajn | Chlorine dioxide generation from chloric acid |
| WO1993004979A1 (en) * | 1991-09-12 | 1993-03-18 | Eka Nobel Ab | Acidity control in chlorine dioxide manufacture |
-
1994
- 1994-06-30 WO PCT/SE1994/000651 patent/WO1995001466A1/en active Application Filing
- 1994-06-30 CA CA002166077A patent/CA2166077C/en not_active Expired - Lifetime
- 1994-06-30 NZ NZ268446A patent/NZ268446A/en not_active IP Right Cessation
- 1994-06-30 AU AU71348/94A patent/AU7134894A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO1995001466A1 (en) | 1995-01-12 |
| CA2166077C (en) | 2000-06-27 |
| NZ268446A (en) | 1997-10-24 |
| AU7134894A (en) | 1995-01-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20140630 |