• 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:
    VIPOLARSHY ELECTRODE FOR ELECTROCHEMICAL PROCESSES, having a vertical base sheet enclosed in a rectangular frame, an external mesh anode made of a valve metal with a non-passivable coating applied to it, and an external mesh cathode made of corrosion resistant material, arranged in a basic pattern. and spacers placed; between the main sheet and the remote anode and cathode over their entire width, with the spacers and the main sheet from the anode side made of a valve metal, and from the side of the cathode made of steel, characterized in that, in order to reduce the costs, the spacers are made in the form of partitions passing over most of the height of the base sheet and inclined alternately in. one or another side with respect to the plane perpendicular to the plane of the electrodes, with the formation of vertex (/ tical channels), the ratio of the electrode area enclosed between the two partitions bounding the channel, the cross-sectional area of this channel differs from the similar ratio in the adjacent channel 1.5-8 times.
    公开号:SU1126210A3
    申请号:SU803009404
    申请日:1980-11-28
    公开日:1984-11-23
    发明作者:Пеллегри Альберто
    申请人:Оронцио Де Нора Импианти Электрохимичи С.П.А.(Фирма)；
    IPC主号:
    专利说明:

    The invention relates to the technology of electrochemical production, in particular, to structural elements of filter press type electrolyzers, used, for example, for the production of chromium and alkali by electrolysis of alkali metal chlorides, as well as for other electrolytic processes where gas is released. A bipolar electrode is known that includes a main sheet enclosed in a rectangular wound, and an external perforated anode and cathode, installed parallel to the main sheet and electrically connected, with an unaffected coating lj applied to the external anode and main sheet. The disadvantage of such an electrode is the increased energy consumption during its operation due to the high degree of gas filling of the electrolyte, due to the insignificant internal circulation of the electrolyte in each of the electrode spaces. A bipolar electr is also known, consisting of a main sheet and remote grid electrodes located at some distance from the main sheet and parallel to it and connected electrically. The external grid anode and the main sheet from the anode side are made of a valve metal with a non-passivating coating applied to it, the cathode and the side of the main sheet facing the cathode are made of a corrosion-resistant material. Metal partitions 2j are installed between the main sheet and the electrodes over their entire width. The energy consumption during operation of a known electrode is quite high, since the partitions between the main sheet and the electrodes only slightly improve the circulation of the electrolyte, reducing its gas flow. The aim of the invention is to reduce the energy consumption during operation of the electrode by improving electrolyte circulation. This goal is achieved by the fact that in a bipolar electrode for electrochemical processes, having a vertical base sheet enclosed in a rectangular frame, an external mesh anode made of a valve metal coated with a non-passivable coating, and an external mesh cathode made of a corrosion-resistant material, installed parallel to the main sheet and electrically connected, and spacers placed between the main sheet and the remote anode and cathode across their entire width, while the spacers and main The second sheet from the anode side is made of a valve metal, and from the side of the cathode is made of steel, the spacers are made in the form of partitions, which pass along most of the height of the main sheet and are alternately inclined in one direction or another relative to the plane perpendicular to the plane of the electrodes, to form vertical channels, with this ratio of the electrode area enclosed between two partitions bounding the channel to the area of the cross section of this channel differs from the similar ratio in the adjacent channel by 1.5-8 p az The essence of the invention is that the partitions passing almost the entire height of the electrode space and having a width equal to the thickness of the electrode space, alternately tilted in one direction or another relative to the vertical plane perpendicular to the plane of the electrodes, divide the entire electrode space vertical channels and, due to the fact that the ratio of the electrode area enclosed between the partitions bounding the channel to the cross-sectional area of this channel differs from such However, in the adjacent channel, numerous recirculation flows are formed in the electrolyte, effectively mixing the entire mass of electrolyte in the electrode space. Depending on the area of the electrode enclosed between the two partitions, gas filling: the electrolyte in two adjacent channels is different, which causes the occurrence of multidirectional currents, capturing the entire mass of electrolyte. The high circulation rate ensures a uniform electrolyte composition over the entire electrode surface and, therefore, optimal working conditions, which is especially important when working with high current densities. The use of the entire electrode area in the optimal mode allows for an increase in the current output of the product, eliminating undesirable reactions caused by concentration gradients in the electrolyte and. ultimately, reduce the energy consumption in the process of electrolysis. FIG. 1 shows two bipolar electrodes with a diaphragm mounted between NI14I, top view} in FIG. 2 is a fragment of a bi-polar electrode J in FIG. 3 shows a bipolar electrode in accordance with another embodiment of the invention, top view; in fig. 4 and 5 — bipolar electrode, view from the anode side. The bipolar electrode consists of a base sheet 1 made of bimetallic, for example, from a thick sheet of steel 1q or another cathode material with a thickness of about 7-15 mm, and a thin sheet tb of titanium or another valve metal with a thickness of 1-2.5 mm. The rectangular frame 2 is welded from rolled steel with a thickness of 15-30. mm The surface of the frame on the side of the anode space is covered with a thin sheet 2b of titanium or another valve metal, hermetically welded to the sheet 1b of the base sheet. Trapezoidal trenches 3 of 1.5–3 mm thick titanium sheet are welded to the titanium sheet 1b. The gutters run vertically almost the entire height of the anode space and end at a distance of at least 3 cm from the inner surface of the gutter evenly, with some space between them, are placed throughout the width of the anode space. The anode 4 is a grid or porous sheet titanium or other valve metal coated with a layer of non-passivating material, which can be used as oxides of metals of the platy group or oxides of non-precious metals, for example peoovskites, spinels, etc. 9, depending on the thickness of the anode space A, the inclination of the side walls 3 .a and 3b of the channels 3 and the distance B between the channels are such that the ratio of the surface area of the anode C between the edges of the walls. Za and Zb gutters, to the area pop-. The river section of the gutter differs from the ratio of the surface area of the anode P enclosed between the walls of Za and Zb to the cross-sectional area of the adjacent gutter by 1.5-8 times. For example, if the gutter height is about 1 m, the indicated ratios in the two cor gantry gutters should be different. 3-5 times. Similar to the anode side of a bipolar electrode with a cathode one. preferably opposite, correspondingly, huaiuk anode -gutters 3, wrought trapezoidal trenches 5 with a thickness of 1.5-3 mm, made of steel, nickel or other material resistant to alkali and hydrogen. The cathode 6 is a grid or / porous nickel steel sheet or. another corrosion-resistant material. When assembling an electrolytic cell, between the anode grid of the bipolar electrode and the cathode grid of the adjacent electrode a diaphragm 7 is installed, which can be a cation-exchange membrane. The compressive strengths of the electrode package in the electrolyzer are sometimes sufficient to allow the grooves in the electrode spaces to be welded to the electrodes. -. . FIG. 3 shows an embodiment of a V-shaped groove. Electrical contact with the grid electrodes is provided by welding the electrode grids to the tops of the grooves. Such a design is preferable when electrodes 4 and b should be assigned a distance from diaphragm 7 and welded to the grooves. Channels can be formed not only by installing a certain type of gutters, but also by welding corrugated sheets or grids to the surface of the base sheet. FIG. 4 .and 5 are shown different ways to perform partitions, nakloieInyh in this or that. the other side relative to the plane perpendicular to the plane of the electrodes, both in the transverse and in the longitudinal direction. In either case, the gas enclosed between the partitions bounding the channel is forced to go through the flow section that differs from the flow section of the channel adjacent to it, resulting in a density of gas bubbles that will cause the electrolyte to move up in the channel a higher density of gas bubbles and at the same time a downward movement of the electrolyte in the adjacent channel, as a result of which recirculation electrolyte flows occur. The proposed interval between the difference in the area of the electrode enclosed between the two partitions bounding the channel and the cross section of this channel from the similar ratio of the channel adjacent to it is 1.5–8 times due to the fact that when the gas fraction in the two adjacent channels becomes almost the same, and the driving force disappears to a certain extent for electrolyte circulation and at a value above 8 the electrolyte circulation is so large that it is difficult to separate the gas phase trapped by the liquid, especially in the downstream electrolytic flux. The electrolysis cell was used using the proposed bipolar electrodes with the following geometrical dimensions: the thickness of the anode and cathode space was 2 cm, the electrode height was 100 cm, the width was ISO cm, vertical, the length of the grooves was 90 cm, the ratio of these the relationship of two adjacent channels was 3: 5. An electrolysis of sodium chloride at a concentration of 300 g / l, pH 3.5, and a current density of 2500 A / m was carried out in an electrolytic cell comprising two bipolar electrodes placed between the end monopolar anode and cathode and separated by a cation-exchange membrane. The anolyte concentration in the outflow from the anode spaces is 160 g / l, the catholyte concentration at the outlet from the cathode spaces is 20Z. Iapr cells on a cell was 3.9 V, and | the course of current - 93%. When testing an electrolyzer equipped with bipolar RC electrodes with the same geometric dimensions, but without grooves, ensure circulation, with the same process parameters, the cell voltage was 4, V V, current output was -88%. Thus, the use of bi-polar electrodes of the proposed design, as compared with the known bipolar electrodes, will allow an approximately 5-6% reduction in the costs: Electricity.
    2
    Evil
    2b
    FIG.
    权利要求:
    Claims (1)
    [1]
    A BIPOLAR ELECTRODE FOR ELECTROCHEMICAL PROCESSES, having a vertical main sheet enclosed in a rectangular frame, a remote mesh anode made of valve metal coated with a non-passivating coating, and a portable mesh cathode made of corrosion-resistant material, mounted parallel to the main sheet and connected electrically, and spacers placed; between the main sheet and the remote anode and cathode over their entire width, while the spacers and the main sheet on the anode side are made of valve metal, and on the cathode side are made of steel, characterized in that, in order to reduce energy consumption, the spacers are made 'in the form of partitions extending over most of the height of the main sheet and tilted alternately in one direction or another relative to the plane perpendicular to the plane of the electrodes, with the formation of vertical channels, with the ratio of the area of the electrode enclosed. between the two partitions that limit the channel, k, the cross-sectional area of this channel differs from the same ratio in the adjacent channel by 1.5-8 times.
    5U .1126210
    1126210 2
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    同族专利:
    公开号 | 公开日
    DD154831A5|1982-04-21|
    EP0031897A2|1981-07-15|
    ES497263A0|1981-12-16|
    AR227296A1|1982-10-15|
    FI67728C|1985-05-10|
    YU42544B|1988-10-31|
    NO803330L|1981-06-01|
    MX148530A|1983-04-29|
    HU183256B|1984-04-28|
    US4518113A|1985-05-21|
    RO81392A|1983-04-29|
    EP0031897B1|1989-07-12|
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    AT44554T|1989-07-15|
    FI803655L|1981-05-30|
    AU532517B2|1983-10-06|
    EP0111149A1|1984-06-20|
    ES505339A0|1982-10-01|
    IT1163737B|1987-04-08|
    PL228167A1|1981-09-18|
    NO157383B|1987-11-30|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    IT27690/79A|IT1163737B|1979-11-29|1979-11-29|BIPOLAR ELECTROLIZER INCLUDING MEANS TO GENERATE THE INTERNAL RECIRCULATION OF THE ELECTROLYTE AND ELECTROLYSIS PROCEDURE|
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