SU1325104A1 - Arrangement for introducing brine into chlorine electrolyzer - Google Patents

Abstract

The invention relates to electrolytic cell assemblies and makes it possible to increase the reliability of the PL device by counting P11 rotates of the slit corrox-g. The invention relates to a brine device in a chlorine electrolyzer placed on the lid of the latter, comprising a titanium ring welded to the lid of the electrolyzer, a titanium nipple with an anode-active coating deposited on its inner surface, connected to the titanium ring with its lower flange, a flat ring rubber gasket, located between the ring and the flange, and the central tube of non-conductive material for brine inlet, with the nozzle in the upper part equipped with a flange on which is fixed two plane rings of electrically insulating material on the inner surface at the junction of rings BbinLXT- Neno deepening V-shape, R which is placed to seal. . The flat annular gasket is made of electrically conductive rubber with carbon cloth pressed on its planes, and the width of the annular gap between the nozzle and the neutral tube is 0.2-J, from the inside (; nozzle diameter. 1 ill. (L with to

Description

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The invention relates to electrochemical production, in particular, to brine injectors into electrolytic cells, which are used in the chemical production of chlorine and caustic soda.

The aim of the invention is to improve the reliability of the device by preventing crevice corrosion.

The drawing shows a device located on the lid of the cell, a cross-section.

 the same flange 1 made of electro and olivine material (fluoroplastic fiberglass, textolite and np.j, resistant in this environment, is located coaxially with the central tube and titanium tube 3. When the flanges are closed, their inner annular surface forms a V-shaped groove in which sealing rubber ring 4, with its inner surface of the central tube 2. The flanges 1 are attached to the upper flange of the pipe 3 with the-M (bolts 5, passing through all the grids of the flange and providing, besides; ntsov 1, lix collapsing mt-zhlu with about 011. Between the lower flange a is coarse, 1) and the titanium ring 6 welded to the lid of the P1 ... titan ring 6 ring ring 7 of the Kc) O11rop11; - p: n 1aie luiBepxHocTH which pressed carbon fabric, which is an anode-active material in relation to g, acidification of chlorine ions contained in the electrolyte (brine). On the inner surface of the titanium pipe 3, including its flanges, a coating is applied, which is also anode-active with respect to oxidation (solution components. Oxidation, manganese oxide and other coatings may be used in chloride solutions.

The width of the annular gap between the inner surface of the nozzle 3 and the outer surface of the central tube 2 is at least 10 mm.

The device operates as follows.

The central tube 2 is placed inside the manifold 3 and the flanges 1 are stacked together. In this case, the gasket 4, placed in a V-shaped recess between them, is pressed against the tube 2 with the necessary density,

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providing the necessary tightness of the npVi brine inlet fixing unit of tube 2 at any desired height. Subsequently, the tube can be moved in height without further adjusting the degree of pressing of the gasket 4 by the flanges 1.

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Thus, the proposed brine injection unit completely fulfills the operational functions of the nodes.

At the same time, the details of the proposed brine injection unit, in contrast to the known, do not corrode in creams. The prevention of corrosion in the gaps under the ring gasket is achieved by using a gasket 7 made of electrically conductive rubber with an anode-active layer made of carbon fabric pressed into rubber on both sides of the NPSK of the ring gasket. Due to the high electrochemical activity of this layer, the anodic current in the slit is consumed (regardless of the nature of the change in the solution composition in the slit) to release chlorine on the anodically active layer at low potentials (about 1.4 V), much more negative than the activation potential of titanium. As a result, the titanium ring 6 and the lower fitting of the nozzle 3 retain CToiiKocTb. In addition, taking on the part of the anode, the gasket partially unloads the anode-active coating of the nozzle 3, increasing its service life.

Prevention of corrosion of the pipe 3 is achieved due to the fact that its cylindrical surface with the proposed design of the device is not located in the gap as it was Ez known design. The annular gap between the inner surface of the nozzle 3 and the outer surface of the central tube is at least 10 mm. Experiments conducted on titanium in a solution of 300 g / l sodium chloride, saturated with chlorine, have shown that the slit effect is manifested in

, Q, the gap width of the titanium inert counterbody is less than 5 mm with a gap depth of 100 mm. To increase the reliability of the construction, the admissible width of the gap was taken to be 0.2-0.4 from the inner diameter of the nozzle. The upper limit of the width of the annular gap between the nozzle and the central tube is determined by the design parameters of the other elements of the cell cover.

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and does not affect the corrosion resistance of the parts of the brine injection unit into the cell cover.

Thus, the proposed device for brine injection, having all the necessary performance characteristics, is capable of maintaining durability in the areas affected by external current in the gaps and gaps (O

Formula

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about and about and and

A device for introducing brine into a chlorine electrolyzer, pa3Mei: i.eHHvie on the lid of the latter, included a titanium ring welded to the cell trimmer, a titanium tube coated on its inner surface with an anode active coating, connected to the titanium ring with its bottom flange, flat ring re

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a zine gasket located between the ring and the flange, and a center tube made of non-conductive material for brine inlet, so that, in order to increase the reliability of the device by preventing slit corrosion, the nozzle in the upper part is provided with a flange, on which are two flat rings of electrically insulating material, on the inner surface at the junction of rings B1) 1 is filled with a V-shaped recess, in which a sealing ring is placed, a flat ring gasket electrical conductive rubber with carbon cloth pressed on its planes and the width of the annular gap between the nozzle and the central tube is 0.2-0.8 of the inner diameter of the nozzle.

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Compiled by O. Zobnin Editor G. Volkova Tehred L. Serdyukova Proofreader S. Shekmar

Order 3024/26 Circulation 612 Subscription

VIILPI State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Rau; 11ska nab. D. 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Claims (1)

Claim A device for introducing a brine into a chlorine electrolyzer placed 15 on the lid of the latter, including a titanium ring welded to the lid of the electrolyzer, a titanium nozzle coated with an anode-active coating on its inner surface, 20 connected to the titanium ring with its lower flange, and a flat rubber ring a gasket located both on the flange and on the central conductive heater — between the ring a tube made of material to improve the brine input, in order to ensure reliable operation of the device by preventing crevice corrosion, the pipe in the upper part is equipped with a flange on which two flat rings of electrical insulation material are fixed, a V-shaped recess is made on the inner surface at the junction of the rings, in which the sealing ring is placed, the flat ring gasket is made of conductive rubber with pressed on its planes with carbon cloth and the width of the annular gap between the pipe and the Central tube is 0.20.8 of the inner diameter of the pipe. A node-actide coating on the tube But one - the active layer on the gasket