GB1045675A - Process for the electrolytic production of dithionites - Google Patents
Process for the electrolytic production of dithionitesInfo
- Publication number
- GB1045675A GB1045675A GB2720362A GB2720362A GB1045675A GB 1045675 A GB1045675 A GB 1045675A GB 2720362 A GB2720362 A GB 2720362A GB 2720362 A GB2720362 A GB 2720362A GB 1045675 A GB1045675 A GB 1045675A
- Authority
- GB
- United Kingdom
- Prior art keywords
- catholyte
- cell
- dithionite
- cation
- mercury
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/14—Alkali metal compounds
Abstract
An alkali metal dithionite is prepared by passing D.C. through a cell having a mercury cathode, an aqueous catholyte containing a sulphite/bisulphite solution and an aqueous anolyte containing a salt of the alkali metal required as the dithionite cation, the catholyte and anolyte being separated by a diaphragm permeable to the cation but impermeable to water and sulphur acid anions, the catholyte being continuously circulated through the cathode compartment of the cell and treated externally to remove the alkali metal dithionite formed in it. The catholyte is kept turbulent and the cation concentration is not allowed to fall more than 20% below that chosen for operation. To depress the solubility of the dithionite a salt of the corresponding cation is included in the catholyte which may be cooled externally to assist removal of the dithionite by a filter or centrifuge. The desired cell temperature is obtained by cooling effected by the catholyte circulation, with if desired circulation of the mercury cathode through the cell or passage of cooling fluid in contact with the underside of the mercury layer. The pH of the catholyte is held to 4.5 to 6 either with phosphate, phthalate, acetate, or citrate buffers or preferably by addition of SO2. For the production of sodium dithionite the cell temperature is in the range 0 to 60 DEG C. and if the temperature is above 20 DEG C. the catholyte is cooled externally to 20 DEG C. The maximum C.C.D. is 0.2 amp/cm2 and for cell temperatures of 20 to 30 DEG C. the current should be at least 10 amps/litre of catholyte. The catholyte is circulated to change the cathode compartment contents 1 to 10 times per amp. hour. As described, the cell is a glass cylinder with a mercury pool covering the bottom and fed with catholyte into which dips a methacrylate polymer cylinder closed at its lower end by a thin disc of a sulphonated polystyrene cation exchange resin and containing saturated brine and graphite anodes. To provide an oxygen free atmosphere, the cathode compartment is fed with nitrogen at super-atmospheric pressure and this provides a gas lift to remove the catholyte through a vertical tube, provision also being made to feed SO2 into the catholyte. The cell is maintained at 5 DEG C. and the sulphite-bisulphite catholyte is saturated with sodium chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2720362A GB1045675A (en) | 1962-07-16 | 1962-07-16 | Process for the electrolytic production of dithionites |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2720362A GB1045675A (en) | 1962-07-16 | 1962-07-16 | Process for the electrolytic production of dithionites |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1045675A true GB1045675A (en) | 1966-10-12 |
Family
ID=10255853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2720362A Expired GB1045675A (en) | 1962-07-16 | 1962-07-16 | Process for the electrolytic production of dithionites |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1045675A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4144146A (en) * | 1976-10-16 | 1979-03-13 | Basf Aktiengesellschaft | Continuous manufacture of sodium dithionite solutions by cathodic reduction |
| US4740287A (en) * | 1986-12-19 | 1988-04-26 | Olin Corporation | Multilayer electrode electrolytic cell |
| US4761216A (en) * | 1987-04-01 | 1988-08-02 | Olin Corporation | Multilayer electrode |
| US4770756A (en) * | 1987-07-27 | 1988-09-13 | Olin Corporation | Electrolytic cell apparatus |
| US4793906A (en) * | 1986-08-04 | 1988-12-27 | Olin Corporation | Electrochemical process for producing hydrosulfite solutions |
| US4992147A (en) * | 1986-08-04 | 1991-02-12 | Olin Corporation | Electrochemical process for producing hydrosulfite solutions |
-
1962
- 1962-07-16 GB GB2720362A patent/GB1045675A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4144146A (en) * | 1976-10-16 | 1979-03-13 | Basf Aktiengesellschaft | Continuous manufacture of sodium dithionite solutions by cathodic reduction |
| US4743350A (en) * | 1986-08-04 | 1988-05-10 | Olin Corporation | Electrolytic cell |
| US4793906A (en) * | 1986-08-04 | 1988-12-27 | Olin Corporation | Electrochemical process for producing hydrosulfite solutions |
| US4992147A (en) * | 1986-08-04 | 1991-02-12 | Olin Corporation | Electrochemical process for producing hydrosulfite solutions |
| US4740287A (en) * | 1986-12-19 | 1988-04-26 | Olin Corporation | Multilayer electrode electrolytic cell |
| US4761216A (en) * | 1987-04-01 | 1988-08-02 | Olin Corporation | Multilayer electrode |
| US4770756A (en) * | 1987-07-27 | 1988-09-13 | Olin Corporation | Electrolytic cell apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| IL41733A (en) | Control of electrolyte concentrations in membrane cells for the electrolysis of sodium chloride | |
| GB787976A (en) | Electrolysis process | |
| FR2460342B1 (en) | ||
| FR2411899A1 (en) | PROCESS FOR THE ELECTROLYSIS OF SODIUM CHLORIDE USING A CATION EXCHANGE MEMBRANE | |
| GB1045675A (en) | Process for the electrolytic production of dithionites | |
| US2865823A (en) | Method of reclaiming waste pickle liquor | |
| FR2443517A1 (en) | PROCESS FOR THE PREPARATION OF GLYOXALIC ACID BY ELECTROLYTIC OXIDATION | |
| FR2417553A1 (en) | PROCESS FOR THE ELECTROLYSIS OF SODIUM CHLORIDE BY AN ION EXCHANGE MEMBRANE PROCESS | |
| GB843010A (en) | Improvements relating to processes for purifying waste water especially sewage water | |
| GB1263818A (en) | Improvements in or relating to electrolytic diaphragm cells | |
| JPS6221872B2 (en) | ||
| GB1513109A (en) | Method for concentrating aqueous caustic alkali solution | |
| GB845511A (en) | Improvements relating to the production of metal hydroxides | |
| GB1045630A (en) | Method of producing pure nickel by electrolytic refining and product thus obtained | |
| JPS5558383A (en) | Stopping method for electrolytic cell of cation exchange membrane method | |
| GB1051597A (en) | ||
| DE69838632D1 (en) | Method of electrolysis of a saline solution | |
| JPS5591989A (en) | Electrolysis method | |
| GB1036416A (en) | Improvements in or relating to electrolytic oxidation | |
| GB1292102A (en) | Electrolytic cell | |
| GB1375656A (en) | ||
| US2104549A (en) | Manufacture of lead borate | |
| SU146048A1 (en) | Method for producing lithium oxide hydrate | |
| SU107724A1 (en) | The method of electrolysis of aqueous solutions of alkali metal chlorides in diaphragm electrolyzers | |
| RU2154126C1 (en) | Method of preparing peroxomonosilicic acid |