An electrochemical fluorination electrolyzer

Abstract

The invention discloses an electrochemical fluorination electrolytic cell, which comprises a cell body (1), a cell cover (2), a temperature control jacket (3) on the side wall of the cell body, a bottom discharge valve (4), and an electrode group (5 ), the anode conductive rod (6), the cathode conductive rod (7), the conductive beam (8), the structure of the electrode group is: the electrode plate is fixed by the fixed shaft (15) passing through the pole plate center hole (19) , the distance between the electrode plates is controlled by an annular insulating pad (17), and the fixed shaft fixes the electrode plates into a group of electrode groups through the insulating nuts (16) at both ends; the conductive beam has a hollow structure, and the electrodes on the electrode plates The screw rod (20) passes through the hollow structure and is fixed on the conductive beam, and the conductive beam is assembled with the tank cover (2) through the negative and anode conductive rods. The electrolytic cell has the characteristics of large capacity, high space utilization rate, and large effective electrolysis area. The electrode plate is movably connected with the conductive beam, which is easy to disassemble and assemble.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to an electrochemical fluorination electrolytic cell. Background technique [0002] The electrolytic fluorination method, also known as the Simons method, uses nickel as the anode, nickel or iron as the cathode, dissolves the organic reactant in anhydrous hydrogen fluoride to form a conductive electrolyte, and controls the voltage at a lower temperature to 4.5-6.0V , a method of introducing fluorine into organic molecules by anodic electrochemical fluorination. Electrolytic fluorination is currently widely used in the preparation of perfluorinated compounds. [0003] In the prior art, the Simons type electrolyzer mostly adopts a cylindrical electrolytic kettle with an electrode stack structure, and the electrolyte between the electrodes circulates by natural force during the electrolysis process, in which there is exchange of cold and heat, rising of gas and liquid The drop supplem...

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Problems solved by technology

[0004] Since the electrode stack is mostly square, the cylindrical electrolytic kettle has disadvantages such as low space utilization rate in the kettle and small effective electrolysis area.

During the process of electrolytic fluorination, organic matter breakage and carbonization reactions occur on the surface of the electrode, and solid residues are deposited on the bottom of the electrolytic cell, which may easily lead to blockage of the discharge port at the bottom

The corrosion of the plate and the deposition of solid residues hinder the progress of electrolysis, resulting in a gradual decline in electrolysis efficiency. The electrolysis process needs to be dismantled and inspected regularly, and the surface of the electrode must be polished to ensure that the surface of the electrode is clean

At present, most of the electrode plates are connected by fixed connections, and the electrode plates cannot be disassembled in a single piece. Since the distance between the electrode plates required by the electrolytic fluorination process is very small, it is often necessary to cut off the electrode plates and then weld them during the dismantling process, which is time-consuming and laborious.

[0005] In the prior art, the electrode plate spacing of each electrode group is fixed, but different electrolytic raw materials have different requirements for the electrode plate spacing. To produce different products, different electrode plate spacing needs to be adjusted. In the prior art, the electrode set must be replaced as a whole. The slot is labor intensive

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