Monopole parallel filter-pressing type electrolytic cell for electrochemical fluorination

[0027]Example 1

[0028]An electrochemical fluorinated unipolar parallel filter press electrolytic cell, such asfigure 1 As shown, an electrochemical fluorinated single-pole parallel filter press type electrolytic cell includes a cell body. The cell body is provided with a relatively parallel left end plate 1 and a right end plate 19, the left end plate 1 and the right end plate The electrolysis area between the plates 19 is provided with a number of relatively parallel tie rods 16. The two ends of the tie rods 16 are locked and fixed on the left end plate 1 and the right end plate 19 by a disc spring 14 and a fastening nut 15; the left end A number of anode plates 6 and a number of cathode plates 7 are arranged between the electrode plate 1 and the right end plate 19. The anode plates 6 and the cathode plates 7 are alternately arranged, and the left end plate 1, several anode plates 6, several cathode plates 7, and the right end The electrode plates 19 are distributed side by side and are fixed by a filter press type series connection formed by a tie rod 16 and a fastening nut 15; the left end electrode plate 1 and the right end electrode plate 19 are all welded with a terminal 18, and the anode plate 6 has a male terminal 10. The female terminal 11 on the cathode plate 7; the terminal 8 of the left end plate 1, the right end plate 19, and the female terminal 11 on each cathode plate 7 are all connected to the negative electrode through a copper cathode flexible connection 12 On the main conductive bar 13, each of the positive terminals 10 on the anode plate 6 is connected to the positive main conductive bar 8 through a copper flexible connection 9; an electrolyte inlet 2 is opened in the middle of the lower side of the left end plate 1 , An electrolyte gas-liquid outlet 17 is opened on the upper side of the right end plate near the middle.

[0029]Further, the electrolyte gas-liquid outlet is divided into an anode gas-liquid outlet 20 and a cathode gas-liquid outlet 21, the electrolysis liquid inlet 2 is connected to the lower liquid inlet of each electrolysis cell, the anode gas-liquid outlet 20, the cathode The gas-liquid outlet 21 is respectively connected to the upper vapor-liquid outlet of each electrolysis cell.

[0030]An insulating gasket 22 is provided between the left end plate 1, a number of anode plates 6, a number of cathode plates 7, and the right end plate 19 to prevent leakage. The insulating gasket 22 is ring-shaped and made of carbon fiber polytetrafluoroethylene. Ethylene composite or polytetrafluoroethylene material.

[0031]A diaphragm for separating the cathode and the anode is arranged between the left end plate, the anode plate, the cathode plate, and the right end plate. The diaphragm is made of polytetrafluoroethylene and allows ions in the electrolyte to pass through but not the cathode and anode. The gas phase permeates to prevent the reaction between the anode and cathode gas phase.

[0032]The anode plate 6 and the cathode plate 7 are both unisex plates, the left and right sides are provided with concave-convex structures, and the concave-convex structures on both sides are equipped with the secondary catalytic plate 5, the anode plate 6 and the secondary catalytic Several electrolyte channels are formed between the plates 5 and between the cathode plate 7 and the secondary catalytic plate 5; the anode plate 6, the secondary catalytic plate 5, the diaphragm 4, the secondary catalytic plate 5, and the cathode plate 7 are in close contact , Constitute an electrolysis chamber. The electrode spacing of the electrolysis cell is 1-10mm, and the current density is 20-1000mA/cm2.

[0033]The secondary electrode catalytic plate 5 is a nickel wire mesh or a nickel stretched mesh, which can increase the electrode area and reduce the electrolysis potential, and is the site where the main reaction of the cathode and the anode occurs.

[0034]In this embodiment, the left end plate 1, the anode plate 6, the cathode plate 7, and the right end plate 19 are allimage 3 The circle shown.

[0035]The number of the pull rods 16 is 4-20, and they are evenly distributed and fixed along the periphery of the left end plate 1 and the right end plate 19.

[0036]Example 2

[0037]The structure of this embodiment is basically the same as that of embodiment 1. The difference is that when the materials produced by the electrolysis cathode and anode are relatively inert, a polytetrafluoroethylene mesh plate is used instead of the diaphragm 4 to connect the cathode plate 7, the secondary catalytic plate 5, The anode plates 4 are pressed against each other and prevent short circuits. After the diaphragm 4 is removed, there is no diaphragm resistance in the electrolytic cell, which saves electricity and energy. At the same time, the cell structure is simpler and more compact, and maintenance is convenient.

[0038]Example 3

[0039]The structure of this embodiment is basically the same as that of embodiment 1, and the difference is that the left end plate 1, the anode plate 6, the cathode plate 7, and the right end plate 19 are all as followsFigure 4The square shown. Since the nickel plates provided by the suppliers are mostly square, a large amount of expensive nickel plates will be wasted if processed into a round shape. Therefore, the electrolytic cell is directly set to a square shape to reduce the waste of nickel plates.

[0040]The number of the pull rods 16 is 4-20, and they are evenly distributed and fixed along the periphery of the left end plate 1 and the right end plate 19.