GB1091699A - Electrolytic purification of aqueous caustic solutions - Google Patents
Electrolytic purification of aqueous caustic solutionsInfo
- Publication number
- GB1091699A GB1091699A GB464566A GB464566A GB1091699A GB 1091699 A GB1091699 A GB 1091699A GB 464566 A GB464566 A GB 464566A GB 464566 A GB464566 A GB 464566A GB 1091699 A GB1091699 A GB 1091699A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- caustic
- mesh pad
- inches
- strands
- 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
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/28—Purification; Separation
- C01D1/40—Purification; Separation by electrolysis
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
A method of purifying caustic solutions containing metal ion impurities (i.e. metal ions below Al in the electro-motive force series such as Zn, Cr, Fe, Cd, Co, Ni, Sn, Pb, Sb, Cu, Hg, Ag, Pb and Au) comprises subjecting to electrolysis an aqueous caustic solution containing a maximum of 500 p.p.m. metal ion impurities employing at least one anode and at least one mesh pad cathode of an electric current conducting metal which is resistant to caustic under electrolytic cell operating conditions, the mesh pad cathode being from 1/4 to 4 inches in thickness and fabricated of strands having a cross-sectional area equivalent to wire of 0.001 to 0.03 inches in diameter and a strand surface area to pad volume ratio of from 50 to 600 sq. ft. of area per cubic foot in volume. The cathode strands may be of Ni, Ni alloys, stainless steels, mild steel or Ag. The caustic solution may be passed through the cell so as to flow through the mesh pad cathode or the cathode may be vibrated, reciprocated or rotated. Aqueous solutions containing greater than 40% NaOH, a current density of 1 to 6 amps/sq. ft., a solution temperature from 25 DEG C. to its boiling point and Ni anodes may be used.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB464566A GB1091699A (en) | 1966-02-02 | 1966-02-02 | Electrolytic purification of aqueous caustic solutions |
| BE676205D BE676205A (en) | 1963-07-05 | 1966-02-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB464566A GB1091699A (en) | 1966-02-02 | 1966-02-02 | Electrolytic purification of aqueous caustic solutions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1091699A true GB1091699A (en) | 1967-11-22 |
Family
ID=9781112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB464566A Expired GB1091699A (en) | 1963-07-05 | 1966-02-02 | Electrolytic purification of aqueous caustic solutions |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1091699A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5292412A (en) * | 1990-04-12 | 1994-03-08 | Eltech Systems Corporation | Removal of mercury from waste streams |
| EP3196165A1 (en) * | 2013-11-12 | 2017-07-26 | Solvay SA | Concentrated aqueous sodium hydroxide solution and process for treating a sodium carbonate purge |
-
1966
- 1966-02-02 GB GB464566A patent/GB1091699A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5292412A (en) * | 1990-04-12 | 1994-03-08 | Eltech Systems Corporation | Removal of mercury from waste streams |
| EP3196165A1 (en) * | 2013-11-12 | 2017-07-26 | Solvay SA | Concentrated aqueous sodium hydroxide solution and process for treating a sodium carbonate purge |
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