SU1666581A1 - Unit for electrochemical fluorination - Google Patents

Abstract

The invention relates to the field of electrochemical fluorination and can be used in the technology of the synthesis of perfluororganic compounds. The aim of the invention is to increase the yield of the target product by increasing the bulk current density, which is achieved due to the fact that in an apparatus for electrochemical fluorination of organic compounds consisting of an electrolyzer, a gas separator, a device for condensing hydrogen fluoride from electrolysis gases, an electrolyte cooling system and devices to separate the target product, the electrolyzer is made in the form of a bipolar filter-press electrolyzer, in the electrodes of which, in the upper and lower parts, coaxial holes forming the channels through. 1 il.

Description

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The invention relates to electrochemical fluorination and can be used in the technology of the synthesis of perfluororganic compounds.

The purpose of the invention is to increase the yield of the target product by increasing the bulk current density.

The drawing shows the design of a filter-press bipolar electrolyzer of an electrochemical fluorination unit.

The device includes bipolar nickel electrodes 1, frames 2 of non-conductive material, tie rings 3, tension pins 4 current conductors 5, nipples 6, 7 and 8, passage channels 9, holes 10, devices 11 and 12 for separating target product.

The installation works as follows.

In order to create electrolyte circulation inside the electrolyzer of the unit for electrochemical fluorination, in the upper and lower parts of the electrodes from which the apparatus is assembled, holes are made which, after assembling and shrinking them with studs 4, form passage channels 9 for feeding all cells of the apparatus with electrolyte and holes 10 to remove from it a gas-liquid mixture. At one of the extreme electrodes, which work monopolistically, a fitting 7 for the input of the electrolyte and a wide pipeline 6 for the output of the gas-liquid mixture apparatus are mounted. The second end electrode is provided with a nozzle 8 to remove the resultant heavy desired product and sludge. The fitting is connected to a viewing lamp 11. After the system is filled with electrolyte and current is supplied in the cells, electrolysis begins, and a haO is formed.

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liquid mixture entrained through fitting 6 to the gas separator. The resulting electrochemical fluorination products are partially entrained by the gas-liquid mixture in the gas separator, from where the electrolyte enters the intermediate tank, where the desired product is isolated and collected at the bottom.

A discharge of the target product through the lantern 12 is provided. The electrolyte return line to the electrolyzer from the indicated one (tank is made above the drain hole of the finished product. Example. The installation for electrochemical fluorination is equipped with a push-button monopolar electrolyzer to which a current of 20 A is fed, the electrolyte volume equal to 1.5 l, i.e., the volume density of the current is equal to 13 A / l. cells and fed with a current of 8A. The volume of the electrolyte circulating in the installation, is 2L. When the equivalent load equal. §6 A .obemna equal current density is 48 A / l,

almost 4 times more than the installation with a monopolar electrolyzer.

Compared with the known device

For electrochemical fluorination, consisting of a monopolar electrolyzer, a gas separator, a condenser-cooler, an intermediate tank and devices for separating the target product, the proposed installation will significantly increase the yield of the target product.

Claims (1)

An apparatus for electrochemical fluorination of organic compounds consisting of an electrolyzer, a gas separator, a device for condensing hydrogen fluoride from electrolysis gases, an electrolyte cooling system, and a device for separating the target product, so as to increase the yield of the target product by increasing bulk current density, the electrolyzer is made in the form of a bipolar filter-press electrolyzer, in the electrodes of which Coaxial holes are formed in the upper and lower parts, forming passage channels. / k