SU444551A1 - Installation for electrochemical fluorination of substances - Google Patents

Description

one

The invention relates to installations for the electrochemical fluorination of substances with the production of organofluorine products and can be used in electrochemical processes accompanied by large gas and heat production.

A known apparatus for electrochemical fluorination, comprising an electrolyzer and a gas-separator-heat exchanger, connected to the electrolyzer by circulation pipes. The gas separator-heat exchanger is made of tubular cooling elements fixed in the upper and lower tube sheets.

The aim of the invention is to simplify installation, intensify the circulation and mixing of the electrolyte and gas separation, maintain the optimum temperature and reduce the electrolyte in the system,

This is achieved by the fact that the installation is equipped with a condenser-condenser: the gas exchanger-heat exchanger and electrolyzer are placed in one case, equipped with upper and lower covers, the condenser condenser is installed above the kopnvs and connected to the upper case cover lids of the general case

space gas collection apparatus and electrolyte. In addition, tube sheets can be attached to the outer wall of the electrolyzer under the fragile to the horizontal.

Fig, I and presents the proposed installation in cross section,.

The installation includes a housing I with an upper 2 and lower 3 covers, a cooler-capacitor 4, an electrolyzer 5, to the outer walls of which there are upper and lower tube sheets 7 with tubular cooling elements 8,

The electrolyte is circulating through the electrode and pipe spaces, and a cooling agent is fed into the annular space. The surface above the electrode space and the upper tube sheets are the gas separation surface.

The electrolyzer is equipped with upper 9 and lower 10 nozzles for electrolyte drain and electrolysis gas outlet.

To increase bulk current densities, tube sheets can be located at an angle to the horizontal (see figure 2),

Electrolyte 5 is poured into electrolyte, for example, anhydrous hydrogen fluoride-based melt, above upper tube sheets 7. When the current is turned on, the gases and HP fumes released on the electrodes form a gas-liquid emulsion with a specific gravity much less than one. Due to the difference in the specific gravities of this emulsion and the electrolyte having a lower temperature, intensive circulation occurs. The liquid emulsion rises upwards, gas separation takes place above the electrode space and tube sheets 7, the electrolyte freed from gases passes through the tubular cooling elements 8 and cools down. The electrolysis gases through the pipe 9 enter the condenser 4 in the return cooler, where most of the carried hydrogen fluoride and other products condenses and flows into the electrolyzer 5, and the remaining gases are directed to absorption.

The proposed installation provides easy access to the upper and lower parts of the electrode space and makes it easy, without complete disassembly, to clean the lower part of the electrolyzer, the electrode space and the pipe space from sludge.

The unit can operate in a wide range of temperatures and current densities, providing effective gas separation and maintaining the desired temperatures.

The electrolyzer can have any cross section: square, rectangular, round.

The electrode package can be of any design with both upper and lower conductors of different designs.

The installation can be designed for any current load up to 100 ka or more.

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Claims (2)

1 Installation for the electrochemical fluorination of substances containing an electrolyzer and a gas separator-heat exchanger with tubular cooling elements fixed in tube sheets, which, in order to simplify installation, intensify the circulation and mixing of the electrolyte and gas separation, maintaining the optimum temperature and reducing the volume of electrolyte in the system, the installation is equipped with a condenser-condenser, a gas-separator-heat exchanger and electrolytes 5 are placed in one housing, which wives of the upper and lower lids and above which the refrigerator-condenser is installed, connected to the upper lid 0 by a tube, and the tube plates are attached to the outer wall of the electrolyzer, forming, with the corresponding lids of the common body, a space for collecting gas and 5 electrolyte, 2. Installation according to claim 1, characterized in that the tube sheets are attached to the outer wall of the electrolyzer at an angle to the horizontal.