• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    1410313 Coated cathode DIAMOND SHAMROCK CORP 16 Jan 1974 [17 Jan 1973] 02051/74 Heading B2E [Also in Division C7] A coated foraminous cathode for use in a chlor-alkali electrolytic cell, which cathode bears on its active surfaces an adherent and dimensionally-stable diaphragm consisting of asbestos fibres having a discontinuous coating of fused thermoplastic fluorocarbon polymer to bind the fibres together, is made by (a) forming a slurry of fibrous asbestos and particulate thermoplastic fluorocarbon polymer in an aqueous medium, the polymer being present in an amount of 1-70% by weight of the polymer-asbestos total; (b) inserting the cathode to be coated into the slurry and depositing a uniform mixture of asbestos fibres and particulate polymer thereon by means of reduced pressure; (c) heating the coated cathode to a temperature sufficient to soften the polymer and allow it to bind adjacent fibres together without forming a continuous polymer coating over them; and (d) cooling the resultant coated cathode to room temperature. The cathode may be a perforated or expanded metal sheet or mesh, particularly a steel wire screen. The fluorocarbon polymer may be added to the slurry as fibres or granules and may comprise PTFE, polyvinyl fluoride, polyvinylidene fluoride, vinylidene fluoride-tetrafluoroethylene copolymer, perfluoroethylenepropylene copolymer, or a CF 2 =CFCl homopolymer or copolymer thereof with ethylene. The aqueous medium for the slurry may be water, brine, or synthetic or natural cell liquor containing NaCl and NaOH. A surfactant is normally included in the slurry. The coated cathode is usually dried by heating after step (b) and step (c) effected by heating at a higher temperature in an oven.
    公开号:SU910126A3
    申请号:SU741997951
    申请日:1974-01-16
    公开日:1982-02-28
    发明作者:Вильям Фенн.Ш Роберт；Джефферсон Плесс Эмори；Ли Харрис Ричард；Джозеф Оълири Кевин
    申请人:Даймонд Шамрок Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    (54) METHOD FOR OBTAINING ASBESTIC DIAPHRAGM
    I
    The invention relates to a process for preparing the naphragms used in an electrolytic process for the production of chlorine and alkali.
    A known method for producing an asbestos diaphragm involves applying asbestos to a cathode in a suspension containing latex and a colloidal solution of silicon silicate. After the asbestos mass is deposited on the cathode, it is treated with a solution of sodium hydroxide with sodium chloride and the diaphragm of prn IQ 80C 111 is dried.
    The disadvantage of this method is the short lifespan of the resulting diaphragm.
    A known method for producing asbestos bottom-15 fragments includes preparing a suspension of asbestos and a fluorine-containing polymer, applying a suspension to the cathode, drying the cathode, heat treating at a temperature higher than the melting point of fluorine-containing 20 full polymer, and cooling. Fluorine-containing polymer is used in the form of granules 2.
    The disadvantage of this method is that the life of the resulting daafragm is not long enough.
    The purpose of the invention is to increase the service life of the diaphragm. This goal is achieved by the fact that in the process of producing an asbestos diaphragm, including preparing a suspension of asbestos and a fluorine-containing polymer, applying a suspension on the cathode, drying the cathode, heat treatment at a temperature above the melting point of the fluorine-containing polymer, and cooling the fluorine-containing polymer in the form of fibers with a length of 0, 05-2.5 cm and having denier from 1 to 100 or a mixture of these fibers with granules with a diameter of 0.2-100 microns.
    Fluorine-containing full-fiber n granules should be used in ratios from 1: 1 to 50: 1.
    The heat treatment is carried out at a temperature in excess of the melting point of the fluorine-containing polmer at 5-50 ° C.
    权利要求:
    Claims (2)
    [1]
    Polytetrafluoroethylene, polyvinylidene fluoride n-polytetrafluoroethylene copolymer, fluorinated ethylene and propylene copolymer, chlorotrifluoroethylene polymer, chlorotrifluoroethylene and polyethylene copolymer can be used as a fluorine-containing polymer. Example. K1l of water containing 0.05 g of non-ionic octylphenol-oxo-ethoxyethanol as a surface-active substance, 15% sodium chloride and 15% sodium hydroxide, add 5 g of polytetrafluoroethylene fibers (tnn. 330 ° C) with a length of 0.63 cm and a denier 6, 67. After mixing until the polymer fibers are completely wetted, 15 g of asbestos fibers are added. Mixing is continued until a homogeneous suspension is obtained. The cathode of the mesh structure, 0.4 cm thick, made in the form of steel wire, is immersed in suspension under a vacuum of 5.25 cm (Hg) for 5 minutes, after which a full vacuum (60 cm) is created for 10 minutes. The cathode is then removed from the suspension, left under full vacuum for 30 minutes and dried at 95 ° C for one hour, followed by heat treatment at 370 ° C for one hour. Then the diaphragm is cooled to room temperature. The diaphragm thus prepared is used for the electrolytic production of chlorine and alkali under the following conditions: 130 g / l sodium hydroxide, voltage 2.99 volts at a current density of 10 A / 6.45 cm. In this case, the average alkali output over current is 97.5%, and the life of the diaphragm - 430 days. EXAMPLE 2 Example 1 is repeated with the difference that 10 g of polytetrafluoroethylene fibers 1.25 cm long and denier are used. The diaphragm is tested under the following conditions: 130 g / l of sodium hydroxide, voltage 2.90 V at a current density of 10 A / 6.45 cm. In this case, the average alkali yield is 98%, and the service life of the diaphragm is 445 days. EXAMPLE 3 Example 1 is repeated with the difference that the heat treatment is carried out at 335 ° C for one hour. Meanwhile, the average alkali current output is 97%. The diaphragm operates for 200 days without any change in performance. EXAMPLE 5 Example 1 is repeated with the difference that 5 g of a copolymer of poly (vinylidene fluoride) and polytetrafluoroethylene (pl. 171 ° C) are used in the form of fibers with a length of 1.5 cm and denier 10 and heat treatment is carried out at 195 ° C for 90 min. The diaphragm is tested under the following conditions: 130 g / l of sodium hydroxide, a voltage of 2.90 V at a current density of 10 A / 6.45 cm. At the same time, the average alkali output over current is 96%. The diaphragm operates for 290 days without loss of performance. EXAMPLE 6 A repetition with the difference that 8 g of fluorinated polymer of ethylene and propylene are used in the form of fibers 0.5 cm long and 5 denier (tnn. 285 ° C;) available 5 and fully saturated fluorine), and the heat treatment is carried out at 305 ° C for one hour. The diaphragm works for 300 days without loss of performance, the average alkali current yield is 98%. EXAMPLE 7 Example 1 is repeated with the difference that 3 g of chlorotrifluoroethylene polymer are used in the form of fibers 2 cm long and 50 denier (% l. 198 ° C) and heat treated at 215 ° C. within 80 min. Meanwhile, the average alkali current yield is 96.5%. The diaphragm operates for 196 days without loss of performance. EXAMPLE 8 Example 1 is repeated, with the difference that 18 g of a chlorotrifluoroethylene and polyethylene copolymer are used in the form of fibers 0.5 CM long and denier 5 (tnn. 223 ° C) and the heat treatment is carried out at 335 ° C for 100 min. Meanwhile, the average alkali current output is 98%. The diaphragm operates for 250 days without loss of performance. EXAMPLE 9 Example 1 is repeated with the difference that a mixture of 5 g of polytetrafluoroethylene in the form of fibers 0.1 cm long and denier 3 with 5 g of polytetrafluoroethylene in the form of granules with a diameter of 0.2 microns is used. The diaphragm is tested under the following conditions: 130 g / l of sodium hydroxide, a voltage of 2.92 V at a current density of A / 6.45 cm. At the same time, the average alkali output over current is 97.5%. The diaphragm operates for 196 days without loss of performance. Example 10. Example 1 is repeated with the difference that a mixture of 25 g of chlorotrifluoroethylene polymer in the form of fibers 0.05 cm long and denier 1 with 1 g of chlorotrifluoroethylene polymer in the form of granules with a diameter of 10 microns and heat treatment is carried out at 230 ° C. for one hour. The diaphragm is tested under the following conditions: 128 g / l sodium hydroxide, a voltage of 2.95 V at a current density of 10 A / 6.45 cm. In this case, the average alkali output over current is 97%. The diaphragm operates for 130 days without sacrificing performance. Example 11. Example 1 is repeated with the difference that a mixture of 50 g of polytetrafluoroethylene in the form of fibers 1.5 cm long and denier 70 with 1 g of polytetrafluoroethylene in the form of granules with a diameter of 100 microns, as well as 28 g of asbestos fibers are used. The diaphragm is consumed under the following conditions: 130 g / l sodium hydroxide, and a voltage of 2.95 V at a current density of 10 A / 6.45 cm. With an average alkali current output of 98%. The diaphragm works for 138 days without decreasing the productivity. When a diaphragm is obtained by a known method using fluorine-containing polymer in the form of granules, the life of the diaphragm does not exceed 2,200 hours. cathode, drying the cathode, heat treatment at a temperature higher than the melting point of the fluorine-containing polymer, and cooling characterized in that. that, in order to increase the life of the diaphragm, fluorine-containing polymer is used in the form of fibers with a length of 0.05-2.5 cm and: having a denier from 1 to 100 or mixtures of these fibers with granules with a diameter of 0.2-100 microns. 2. The method according to claim 1, that is, in that the fluorine-containing polymer fibers and granules are used in a ratio from 1: 1 to 50: 1. 3. The method according to claim 1, 1, 1 and 2 with the fact that the heat treatment is carried out at a temperature that exceeds the melting point of the fluorine-containing polymer by 5-50 ° C. Sources of information taken into account in the examination 1. USSR author's certificate N 388781, cl. From 25 to 1/34, 05.13.71.
    [2]
    2. USSR author's certificate number 432744, l. C 25 V 13/06, 16.04.71 (prototype).
    类似技术:
    公开号 | 公开日 | 专利标题
    SU910126A3|1982-02-28|Process for producing asbestos membrane
    US4720334A|1988-01-19|Diaphragm for electrolytic cell
    US5183545A|1993-02-02|Electrolytic cell with composite, porous diaphragm
    US4003818A|1977-01-18|Method of obtaining a micro-porous membrane and novel product thus obtained
    CA1065276A|1979-10-30|Diaphragm electrolytic cell
    US4743349A|1988-05-10|Electrically conductive fibrous web substrate and cathodic element comprised thereof
    US4154666A|1979-05-15|Method of making fiber diaphragms
    US4680101A|1987-07-14|Electrolyte permeable diaphragm including a polymeric metal oxide
    US4606805A|1986-08-19|Electrolyte permeable diaphragm and method of making same
    US4036728A|1977-07-19|Converting a diaphragm electrolytic cell to a membrane electrolytic cell
    US4210515A|1980-07-01|Thermoplastic fibers as separator or diaphragm in electrochemical cells
    US3944477A|1976-03-16|Diaphragm for electrolytic cell for chlorine production
    US4126536A|1978-11-21|Diaphragms for chlor-alkali cells
    US4666573A|1987-05-19|Synthetic diaphragm and process of use thereof
    US4547411A|1985-10-15|Process for preparing ion-exchange membranes
    US4110153A|1978-08-29|Method of forming a microporous diaphragm
    US4181592A|1980-01-01|Converting a diaphragm electrolytic cell to a membrane electrolytic cell
    EP0865517B1|2002-07-03|Method for starting a chlor-alkali diaphragm cell
    EP0850326B1|1999-08-18|Bonded non-asbestos chlor-alkali diaphragm
    US4070257A|1978-01-24|Electrolytic process using novel diaphragm
    USRE34233E|1993-04-27|Electrically conductive fibrous web substrate and cathodic element comprised thereof
    US4482441A|1984-11-13|Permeable diaphragm, made from a hydrophobic organic polymeric material, for a cell for the electrolysis of aqueous solutions of an alkali metal halide
    RU2070232C1|1996-12-10|Microporous diaphragm for chloro-alkali electrolysis, method of fabrication thereof, and unit of diaphragm electrolyzer
    US4302303A|1981-11-24|Permeable diaphragm for an electrochemical cell
    SE7507524L|1976-10-10|ASBESTIA DIAGRAPHIC CATHOD FOR ELECTROLYSIS CELLS
    同族专利:
    公开号 | 公开日
    ZA74315B|1975-03-26|
    GB1410313A|1975-10-15|
    CA1057699A|1979-07-03|
    DE2401942B2|1977-08-04|
    AR200170A1|1974-10-24|
    NL7400587A|1974-07-19|
    ATA36374A|1975-05-15|
    DE2401942A1|1974-08-01|
    DD109322A5|1974-11-05|
    BR7400298D0|1974-08-22|
    AT327957B|1976-02-25|
    IL44017D0|1974-05-16|
    IT1008702B|1976-11-30|
    JPS49102578A|1974-09-27|
    PL88547B1|1976-09-30|
    FI58795B|1980-12-31|
    CS212751B2|1982-03-26|
    US4410411A|1983-10-18|
    IL44017A|1976-12-31|
    FI58795C|1981-04-10|
    FR2213805B1|1977-09-09|
    AU466303B2|1975-10-23|
    FR2213805A1|1974-08-09|
    JPS5343149B2|1978-11-17|
    HU166833B|1975-06-28|
    IN137805B|1975-09-20|
    AU6452274A|1975-10-23|
    RO65954A|1980-06-15|
    BE809822A|1974-07-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US1862244A|1932-06-07|K e stuart |
    US2338602A|1939-12-04|1944-01-04|Reconstruction Finance Corp|Fabrication of wet-strengthened papers|
    BE475208A|1942-05-25|1900-01-01|
    US2568144A|1945-12-05|1951-09-18|Union Asbestos & Rubber Co|Felted material and method of making the same|
    US2626213A|1948-12-21|1953-01-20|Raybestos Manhattan Inc|Asbestos dispersions and method of forming same|
    US2962414A|1956-03-05|1960-11-29|Hurlbut Paper Company|High strength specialty papers and processes for producing the same|
    BE624231A|1961-11-02|
    US3320107A|1963-01-30|1967-05-16|Gen Motors Corp|Method of making a facing for use in energy transmitting device|
    US3369948A|1964-11-12|1968-02-20|Du Pont|Method of producing a pile fabric|
    CA845032A|1966-12-03|1970-06-23|Hacker Heinz|Gas-tight diaphragms for electrochemical cells|
    NL133247C|1967-05-18|
    US3694281A|1969-04-28|1972-09-26|Pullman Inc|Process for forming a diaphragm for use in an electrolytic cell|
    US3723264A|1969-04-28|1973-03-27|Pullman Inc|Electrochemical oxidation of olefinic compounds|
    US4070257A|1970-08-13|1978-01-24|Electrode Corporation|Electrolytic process using novel diaphragm|
    US3989615A|1971-07-06|1976-11-02|Nippon Soda Company Limited|Diaphragm process electrolytic cell|
    US3721637A|1971-11-08|1973-03-20|H Fogel|Method for dispersing asbestos fibers|
    IN2014CN01635A|2011-09-06|2015-05-08|Koninkl Philips Nv|US4701250A|1973-01-17|1987-10-20|Eltech Systems Corporation|Dimensionally stable asbestos diaphragm coated foraminous cathode|
    US4489025A|1973-01-17|1984-12-18|Diamond Shamrock Chemicals Company|Preparation of dimensionally stable asbestos diaphragms|
    FR2229739B1|1973-05-18|1976-09-17|Rhone Progil|
    US4089758A|1974-05-24|1978-05-16|Imperial Chemical Industries Limited|Electrolytic process|
    FR2280609B1|1974-07-31|1978-06-16|Rhone Poulenc Ind|
    JPS5740229B2|1974-10-21|1982-08-26|
    US4210515A|1975-02-10|1980-07-01|Basf Wyandotte Corporation|Thermoplastic fibers as separator or diaphragm in electrochemical cells|
    CA1079225A|1975-02-10|1980-06-10|Eugene Y. Weissman|Bonding of fibers for diaphragms in electrolytic cells|
    JPS5415028B2|1975-04-09|1979-06-12|
    JPS597795B2|1975-04-17|1984-02-21|Tokuyama Soda Kk|
    JPS581191B2|1975-04-24|1983-01-10|Kureha Chemical Ind Co Ltd|
    US4036728A|1976-05-21|1977-07-19|Diamond Shamrock Corporation|Converting a diaphragm electrolytic cell to a membrane electrolytic cell|
    JPS5433797B2|1976-05-28|1979-10-23|
    US4032423A|1976-06-09|1977-06-28|Ppg Industries, Inc.|Method of assembling a bipolar electrolyzer|
    LU78350A1|1977-10-19|1979-06-01|Solvay|METHOD FOR MANUFACTURING A PERMEABLE DIAPHRAGM FOR AN ELECTROLYSIS CELL|
    US4196070A|1977-12-12|1980-04-01|Nuclepore Corporation|Method for forming microporous fluorocarbon polymer sheet and product|
    JPS5618242B2|1978-01-20|1981-04-27|
    US4186065A|1978-04-27|1980-01-29|Ppg Industries, Inc.|Method of preparing a resin-containing asbestos diaphragm|
    US4256845A|1979-02-15|1981-03-17|Glasrock Products, Inc.|Porous sheets and method of manufacture|
    DE2938069A1|1979-09-20|1981-04-02|Siemens AG, 1000 Berlin und 8000 München|ASBEST DIAPHRAGMS FOR ELECTROCHEMICAL CELLS AND THEIR PRODUCTION|
    CA1207705A|1980-09-22|1986-07-15|Shan-Pu Tsai|Dimensionally stable asbestos-polytetrafluoroethylene diaphragms for chlor-alkali electrolytic cells|
    US4444640A|1980-09-22|1984-04-24|Diamond Shamrock Corporation|Dimensionally stable asbestos-polytetrafluoroethylene diaphragms for chloralkali electrolytic cells|
    US4665120A|1983-01-27|1987-05-12|Eltech Systems Corporation|Modified liquid permeable asbestos diaphragms with improved dimensional stability|
    US4447566A|1983-01-27|1984-05-08|Eltech Systems Corp.|Modified liquid permeable asbestos diaphragms with improved dimensional stability|
    US4563260A|1983-01-27|1986-01-07|Eltech Systems Corporation|Modified liquid permeable asbestos diaphragms with improved dimensional stability|
    US4853101A|1984-09-17|1989-08-01|Eltech Systems Corporation|Porous separator comprising inorganic/polymer composite fiber and method of making same|
    US4666573A|1985-09-05|1987-05-19|Ppg Industries, Inc.|Synthetic diaphragm and process of use thereof|
    US4603165A|1985-11-29|1986-07-29|Gte Government Systems Corporation|Material suitable for thermal protection of electrochemical cells and other articles|
    US4741813A|1986-12-15|1988-05-03|Oxytech Systems, Inc.|Diaphragm for an electrolytic cell|
    FR2650842B1|1989-08-10|1992-01-17|Rhone Poulenc Chimie|IMPROVEMENT OF A DIAPHRAGM COMPRISING ASBESTOS FIBERS, ASSOCIATION OF SUCH A DIAPHRAGM WITH A CATHODE ELEMENT AND PROCESS FOR OBTAINING THE SAME|
    US5205911A|1990-11-13|1993-04-27|Oxytech Systems, Inc.|Cathode restoration|
    US5498321A|1994-07-28|1996-03-12|Oxytech Systems, Inc.|Electrolysis cell diaphragm reclamation|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/324,508|US4410411A|1973-01-17|1973-01-17|Dimensionally stable asbestos diaphragms|
    [返回顶部]