GB1092167A - Rejuvenation of porous diaphragms - Google Patents
Rejuvenation of porous diaphragmsInfo
- Publication number
- GB1092167A GB1092167A GB5085/66A GB508566A GB1092167A GB 1092167 A GB1092167 A GB 1092167A GB 5085/66 A GB5085/66 A GB 5085/66A GB 508566 A GB508566 A GB 508566A GB 1092167 A GB1092167 A GB 1092167A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- cell
- diaphragm
- cathode
- brine
- 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
- C25B13/00—Diaphragms; Spacing elements
- C25B13/04—Diaphragms; Spacing elements characterised by the material
- C25B13/05—Diaphragms; Spacing elements characterised by the material based on inorganic materials
- C25B13/06—Diaphragms; Spacing elements characterised by the material based on inorganic materials based on asbestos
-
- 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
- C25B13/00—Diaphragms; Spacing elements
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
An asbestos diaphragm in a chlorine-alkali electrolytic diaphragm brine cell is rejuvenated to restore its liquid permeability by contacting it with an aqueous solution of an acid having an ionization constant greater than 10-5 until the solution passed through the diaphragm has a pH less than 8. As described the cell comprises vertical graphite blades secured in the cell bottom between which pass flattened tubular steel mesh cathode members connected to each other at their ends and to end half cathodes by steel mesh, thus forming a single cathode structure, and asbestos is deposited on the cathode to form a porous diaphragm dividing the cell into separate anolyte and catholyte compartments. After prolonged use, the brine is drained from the catholyte compartment of the cell and acid is introduced into the anolyte compartment and withdrawn from the catholyte compartment. The acid employed may be acetic, formic, sulphuric, phosphoric or phosphorous acid but preferably is hydrochloric acid. To prevent attack of the steel cathode the acid solution may include corrosion inhibitors such as aliphatic or heterocyclic amines, alkanolamines, aldehydes, chromates, glycerine, sugar or molasses.ALSO:An asbestos diaphragm in a chlorine-alkali electrolytic diaphragm brine cell is rejuvenated to restore its liquid permeability by contacting it with an aqueous solution of an acid having an ionization constant greater than 10-5 until the solution passed through the diaphragm has a pH less than 8. As described the cell comprises vertical graphite blades secured in the cell bottom between which pass flattened tubular steel mesh cathode members connected to each other at their ends and to end half cathodes by steel mesh, thus forming a single cathode structure, and asbestos is deposited on the cathode to form a porous diaphragm dividing the cell into separate anolyte and catholyte compartments. After prolonged use, the brine is drained from the catholyte compartment of the cell and acid is introduced into the anolyte compartment and withdrawn from the catholyte compartment. The acid employed may be acetic, formic, sulphuric, phosphoric or phosphorous acid but preferably is hydrochloric acid. To prevent attack of the steel cathode the acid solution may include corrosion inhibitors such as aliphatic or heterocyclic amines, alkanolamines, aldehydes, chromates, glycerine, sugar or molasses.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US44721065A | 1965-04-12 | 1965-04-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1092167A true GB1092167A (en) | 1967-11-22 |
Family
ID=23775432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5085/66A Expired GB1092167A (en) | 1965-04-12 | 1966-02-04 | Rejuvenation of porous diaphragms |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3467586A (en) |
| BE (1) | BE679244A (en) |
| DE (1) | DE1567962A1 (en) |
| GB (1) | GB1092167A (en) |
| NL (1) | NL6604328A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3979223A (en) * | 1971-03-03 | 1976-09-07 | General Electric Company | Electrochemical impregnation of electrode for rechargeable cell |
| US4040919A (en) * | 1974-10-29 | 1977-08-09 | Hooker Chemicals & Plastics Corporation | Voltage reduction of membrane cell for the electrolysis of brine |
| US4118308A (en) * | 1977-12-20 | 1978-10-03 | Olin Corporation | Method of renewing a porous diaphragm having reduced permeability to alkali metal chloride brines |
| US4185142A (en) * | 1978-08-09 | 1980-01-22 | Diamond Shamrock Corporation | Oxygen electrode rejuvenation methods |
| US4217187A (en) * | 1979-05-17 | 1980-08-12 | Hooker Chemicals & Plastics Corp. | Operation of electrolytic diaphragm cells utilizing interruptable or off-peak power |
| US5431823A (en) * | 1994-08-18 | 1995-07-11 | Electric Fuel(E.F.L.) Ltd. | Process for supporting and cleaning a mesh anode bag |
| DE19519921A1 (en) * | 1995-05-31 | 1996-12-05 | Basf Ag | Process for the regeneration of plastic diaphragms |
| US20090242422A1 (en) * | 2008-03-31 | 2009-10-01 | Kazuhiro Kurosu | Method for recovering performance of electrolyzer for use in production of polysulfide and method for stopping holding electrolyzer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1309214A (en) * | 1919-07-08 | Hugh k |
-
1965
- 1965-04-12 US US447210A patent/US3467586A/en not_active Expired - Lifetime
-
1966
- 1966-02-04 GB GB5085/66A patent/GB1092167A/en not_active Expired
- 1966-04-01 NL NL6604328A patent/NL6604328A/xx unknown
- 1966-04-07 BE BE679244D patent/BE679244A/xx unknown
- 1966-04-12 DE DE19661567962 patent/DE1567962A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US3467586A (en) | 1969-09-16 |
| DE1567962A1 (en) | 1970-09-03 |
| NL6604328A (en) | 1966-10-13 |
| BE679244A (en) | 1966-10-07 |
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