IL41038A - Method and apparatus for electrolysis - Google Patents
Method and apparatus for electrolysisInfo
- Publication number
- IL41038A IL41038A IL41038A IL4103872A IL41038A IL 41038 A IL41038 A IL 41038A IL 41038 A IL41038 A IL 41038A IL 4103872 A IL4103872 A IL 4103872A IL 41038 A IL41038 A IL 41038A
- Authority
- IL
- Israel
- Prior art keywords
- percent
- weight
- cathode
- hydrochloric acid
- copolymer
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/20—Manufacture of shaped structures of ion-exchange resins
- C08J5/22—Films, membranes or diaphragms
- C08J5/2206—Films, membranes or diaphragms based on organic and/or inorganic macromolecular compounds
- C08J5/2218—Synthetic macromolecular compounds
- C08J5/2231—Synthetic macromolecular compounds based on macromolecular compounds obtained by reactions involving unsaturated carbon-to-carbon bonds
- C08J5/2237—Synthetic macromolecular compounds based on macromolecular compounds obtained by reactions involving unsaturated carbon-to-carbon bonds containing fluorine
-
- 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
- C25B1/34—Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis
- C25B1/46—Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis in diaphragm cells
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Electrochemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
Electrolysis cell esp. for the electrolysis of NaCl soln., with a casing, an anode, a cathode and a diaphragm which is practically impermeable to liquids and gas and separates the anode and the cathode is characterised by the diaphragm consisting of a hydrolysed copolymer of tetrafluoroethylene and sulphonated perfluorovinyl ether of formula FSO2CF2CF2OCF(CF3)CF2OCF = CF2 with a mol. wt. of 900-1600, pref. 1100-1400. The diaphragm prevents undesirable molecular and ionic migration, but allows conduction of electrical current by movement of desirable ions.
[BE793078A1]
Claims (22)
1. An electrolysis cell for the electrolytic decomposition of aqueous solutions of ioniaable chemical compounds comprising a housing, an anode, a cathode, and a permselective diaphragm substantially impervious to liquids and gases separating the anode from the cathode, the diaphragm consisting essentially of a hydrolyzed oopolymer of tetrafluoroe hylene and a sulfonated perfluorovinyl ether of the formula PS02CP2CP2OCF (CP5)C 2OGP«CF2 said oopolymer having an equivalent weight of from about 900 to 1600.
2. A cell as described in Claim 1 wherein said copolymer has an equivalent weight of from about 1100 to 1400.
3. A process for the electrolytic decomposition of a„queous solutions of ioniaable chemical compounds which comprises electrolysing an aq^ueous solution of a ionizable chemical compound in an electrolytic cell having an anode compartment and a cathode compartmen separated by a diaphragm consisting essentially of a permselective membrane material which is impervious to liquids and gases and is a copolymer of tetrafluoreethylene and a sulfonated perfluorovinyl ether of the formula FSG2CF2CF20CF(C ?)C 20CF*C 2 said copolymer having an equivalent weight of from about t 600 41038/2
4. A process as claimed in Claim 3 wherein the said copolymer t has an equivalent weight of from about 1100 to 1^00.
5. . A process for the production of chlorine and caustic containing low concentration of sodium chloride which comprises electrolyzing aqueous brine solutions in a cell equipped with an -anode and a cathode separated by a permselective diaphragm consisting essentially of a hydrolyzed copolymer of tetrafluoroethylene and a sulfo said copolymer having an equivalent weight of from about 900 to 1600.
6. A process as claimed in Claim 5 wherein said copolymer has an equivalent weight of from about 1 100 to UtOO. \
7. A process as claimed- in Claim § wherein said hydrolyzed copolymer is obtained by treating a copolymer containing sulfonyl fluoride groups with a member of tha group selected from boiling water and hot dilute aqueous caustic alkali. , ·
8. ,. A process as claimed in Claim 7 wherein the copolymer containing sulfonyl fluoride groups is treated with a dilute aqueous caustic alkali solution at about 60 to 8θ degrees centigrade to hydro!yze -the sulfonyl fluoride groups to sodium sulfonate groups. 41038/2
9. A method of electrolytical 1y decomposing ionizable chemical compounds which comprises introducing an. aqueous solution of said ionizable chemical compound into an electrolytic cel l having an anode · compartment and a cathode compartment, said compartments being separated by a homogeneous cation active membrane formed from hydrolyzed copolymer of tetrafluoroethylene and a sulfonated perf luorovinyl ether of the formula FS02CF2 CF20CF (CF3 )CF20CF=CF2 said copolymer having an equivalent weight of from about 900 to 1600, Impressing a decomposition voltage of from about 2.3 volts to 5 volts - across the electrodes disposed in each of said compartments whi le maintaining an andde current density of from about 0.5 to four amperes per square inch and recovering from sai d cathode compartment a product ' containing less than about one percent by weight of said ionizable chemical compound,, 41033/2 10. The method as described in Claim (9 wherein said ionizable chemical compound is an alkali metal chloride and the product recovered from said cathode compartment is an alkali metal hydroxide containing less than one percent of alkali metal chloride. 11. The method as described in Claim 10 wherein the alkali metal chloride is sodium chloride. 12. The method as described in Claim 11 wherein the sodium chloride solution contains from about 200 gpl to 3 0 gpl sodium chloride and the sodium hydroxide concentration in the cathode compartment is ma ntained above about 10 percent by weight. 13. The method as described in Claim 12 wherein the sodium " hydroxide concentration in the cathode compartment is maintained from about 2k percent to about 33 percent by weight. 11 * 'a T*>P,n ^e met^°^ a described in Claim ^ wherein the sodium chloride 69 T'yo solution contains about two to 10 percent by weight of hydrochloric acid. 15. The method as described in Claim 14 wherein "the sodium chloride solution contains from about three to seven percent by weight of hydrochloric acid. 11 "»B Tlp'n 16. The method as described in Claim /Ί0 wherein the sodium 69 yo chloride solution has a pH of about 1.0 to 5-0. 17. The method as described in Cla im 16 wherein the sodium chloride solution has a pH of from about 2.5 to ^.0. 41038/2 . . ; i ! ■ . . , .
10. The method as described in Claim Q wherein said ioni-jable chemical compound is an alkali metal chloride and the produc recovered from said cathode compartment is an alkali metal hydroxide containing less than one percent of alkali metal chloride.
11. The method. as dJscribed in Claim 10 wherein the alkali metal hloride is sodium chloride. X ; " ' · '
12. The method as described in Claim 11 wherein the sodium chloride solution contains from about 200 gpl to 320 gpl sodium chloride and the sodium hydroxide concentration in the cathode compartment is maintained above a nt by weight.
13. The method as described in Claim 12 wherein the sodium ' hydroxide concentration in the cathode compartment is maintained from about 2k percent to about 33 percent by weight. i · . (
14. . The method as describe Id in Claim 10 wherein the sod*ium chloride solution contains about two to 10 percent by weight of hydrochloric acid. ' 1 ■ "
15. The method as described in Claim 14 wherein the sodium chloride solution contains from about three to seven percent by weight of hydrochloric acid.
16. The method as described in Claim 30 wherein the sodium chloride solution has a pH of about 1.0 to 5· 0.
17. The method as described in Claim 16 whsrein the sodium chloride solution has a pH of from about 2.5 to k.O. 41038^'
18. The roethod as described' in Claim 9 wherein the ionizable chemical compound is hydrochloric acid and the product .recovered from the cathode" compartment is hydrogen of high purity.
19. The method as described in Claim 18 wherein the'hydro- chloric acid has an HCl content of from about 10 to 36 percent by weight^. '·" ■·
20. The method as described in Claim 1 wherein the hydrochloric acid has an HCl content of from about .15 to about 25 percent by weight. . . -* 1 8 ' · »£3,7 flp'n 21. The method as described in Claim i whe rein the cathode 69 V?0 compartment is fed with an aqueous hydrochloric acid solution having- an HCl content of from about one to 10 percent by weight. _ • . · ¾ ' 22. The method as described in Claim 21 wherein the cathode com partment is fed with an aqueous hydrochloric acid solution having an HCl content of from about one to five percent by weight. 23· The method as 'described in Claim 18 wherein the hydrochloric- acid contains from about one to about 26 percent by weight of an alkali metal chloride. - 23 41038/2 18· The method as described" in Claim 9 wherein the ionizable chemical compound is hydrochloric acid and the product recovered from the cathode" compartment is hydrogen of high purity. * »* Ϊ9· The method as described in Claim 18 wherein the' hydrochloric acid has an HCl content of from about 1 0 to 36 percent by weight · 20 · The method as described in Claim 19 wherein the hydrochloric acid has an HCl content of.from about.15 to about 25 percent by weight* • * ' .
21. The method as described in Claim 19 wherein the cathode · compartment is fed with an aqueous hydrochloric acid solution having- an HCl content of from about one to 1 0 percent by weight. _
22. The method as described in Claim 21 wherein the cathode com partment is fed with an aqueous hydrochloric acid solution having an HCl content of from about one to five percent by weight. - ~ * , ■ ' · ■ ' 23 · The method as described in Claim 18 wherein the hydrochloric- acid contains from about one to about 26 percent by weight . of an alkali metal chloride.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US21217171A | 1971-12-27 | 1971-12-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IL41038A0 IL41038A0 (en) | 1973-02-28 |
| IL41038A true IL41038A (en) | 1976-08-31 |
Family
ID=22789846
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IL48546A IL48546A (en) | 1971-12-27 | 1972-12-08 | Method for repairing damaged sections of copolymers of tetrafluoroethylene and a sulfonated perfluorovinylether |
| IL41038A IL41038A (en) | 1971-12-27 | 1972-12-08 | Method and apparatus for electrolysis |
| IL48546A IL48546A0 (en) | 1971-12-27 | 1975-11-26 | Method for repairing damaged sections of copolymers of tetrafluoroethylene and a sulfonated perfluorovinylether |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IL48546A IL48546A (en) | 1971-12-27 | 1972-12-08 | Method for repairing damaged sections of copolymers of tetrafluoroethylene and a sulfonated perfluorovinylether |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IL48546A IL48546A0 (en) | 1971-12-27 | 1975-11-26 | Method for repairing damaged sections of copolymers of tetrafluoroethylene and a sulfonated perfluorovinylether |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS4878097A (en) |
| AR (1) | AR196895A1 (en) |
| BE (1) | BE793078A (en) |
| BR (1) | BR7209151D0 (en) |
| CS (3) | CS190446B2 (en) |
| DD (1) | DD101821A5 (en) |
| ES (2) | ES410045A1 (en) |
| IL (3) | IL48546A (en) |
| IT (1) | IT972820B (en) |
| MX (1) | MX3133E (en) |
| NO (1) | NO139610B (en) |
| RO (1) | RO66346A (en) |
| SE (3) | SE383477B (en) |
| SU (1) | SU659078A3 (en) |
| ZA (1) | ZA728589B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3976549A (en) * | 1973-02-26 | 1976-08-24 | Hooker Chemicals & Plastics Corporation | Electrolysis method |
| JPS551351B2 (en) * | 1974-03-07 | 1980-01-12 | ||
| JPS5111098A (en) * | 1974-07-19 | 1976-01-28 | Asahi Glass Co Ltd | Suisankakariumuno seizohoho |
| JPS5154082A (en) * | 1974-11-08 | 1976-05-12 | Asahi Glass Co Ltd | YOION KOKANMAKU |
| JPS5291783A (en) * | 1976-01-29 | 1977-08-02 | Teikoku Piston Ring Co Ltd | Method of protecting diaphragm in electrodialusis or electrolysis |
| JPS5337198A (en) * | 1977-07-15 | 1978-04-06 | Asahi Chem Ind Co Ltd | Electrolytic method of sodium chloride |
| FR2948121B1 (en) * | 2009-07-15 | 2011-08-05 | Commissariat Energie Atomique | FLUORINE COPOLYMERS, MEMBRANES PREPARED THEREFROM, AND FUEL CELL DEVICE COMPRISING THESE MEMBRANES |
-
1972
- 1972-12-05 ZA ZA728589A patent/ZA728589B/en unknown
- 1972-12-08 IL IL48546A patent/IL48546A/en unknown
- 1972-12-08 IL IL41038A patent/IL41038A/en unknown
- 1972-12-15 AR AR245688A patent/AR196895A1/en active
- 1972-12-15 MX MX100198U patent/MX3133E/en unknown
- 1972-12-20 BE BE793078D patent/BE793078A/en unknown
- 1972-12-22 SE SE7216914A patent/SE383477B/en unknown
- 1972-12-22 IT IT33474/72A patent/IT972820B/en active
- 1972-12-23 RO RO7273282A patent/RO66346A/en unknown
- 1972-12-26 JP JP48004563A patent/JPS4878097A/ja active Pending
- 1972-12-26 ES ES410045A patent/ES410045A1/en not_active Expired
- 1972-12-27 NO NO4781/72A patent/NO139610B/en unknown
- 1972-12-27 DD DD167913A patent/DD101821A5/xx unknown
- 1972-12-27 SU SU721866652A patent/SU659078A3/en active
- 1972-12-27 CS CS751903A patent/CS190446B2/en unknown
- 1972-12-27 BR BR9151/72A patent/BR7209151D0/en unknown
- 1972-12-27 CS CS758249A patent/CS190447B2/en unknown
- 1972-12-27 CS CS728958A patent/CS190401B2/en unknown
-
1975
- 1975-05-30 ES ES438085A patent/ES438085A1/en not_active Expired
- 1975-07-31 SE SE7508694A patent/SE412608B/en unknown
- 1975-07-31 SE SE7508695A patent/SE7508695L/en not_active Application Discontinuation
- 1975-11-26 IL IL48546A patent/IL48546A0/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SE7508695L (en) | 1975-07-31 |
| SU659078A3 (en) | 1979-04-25 |
| CS190401B2 (en) | 1979-05-31 |
| ZA728589B (en) | 1974-01-30 |
| MX3133E (en) | 1980-04-28 |
| NO139610B (en) | 1979-01-02 |
| CS190447B2 (en) | 1979-05-31 |
| SE383477B (en) | 1976-03-15 |
| CS190446B2 (en) | 1979-05-31 |
| ES438085A1 (en) | 1977-02-01 |
| IT972820B (en) | 1974-05-31 |
| ES410045A1 (en) | 1976-06-01 |
| SE412608B (en) | 1980-03-10 |
| IL48546A0 (en) | 1976-01-30 |
| IL41038A0 (en) | 1973-02-28 |
| IL48546A (en) | 1976-11-30 |
| AR196895A1 (en) | 1974-02-28 |
| DD101821A5 (en) | 1973-11-20 |
| JPS4878097A (en) | 1973-10-19 |
| RO66346A (en) | 1979-07-15 |
| BE793078A (en) | 1973-06-20 |
| SE7508694L (en) | 1975-07-31 |
| BR7209151D0 (en) | 1974-12-24 |
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