SU1252390A1 - Method of producing chlorine and caustic soda - Google Patents

Description

The invention relates to methods for producing chlorine and caustic soda by electrolyzing a solution of chlorine chloride in electro: electrons with separated electrode spaces.

The purpose of the NCS is to increase the current of the target electrolysis products by uniformly distributing the sodium chloride concentration in the anolyte volume.

Primer p. The proposed method is carried out: on a diaphragm electrolyzer with oxide-ruthenium anodes, operating at a current load of 50 kA with a current density at the anode of 0, H5 L / cm. The feed brine, coming from the cleaning unit, with a concentration of sodium chloride varying in Eremeni from 305 to 317 g / l, is fed into the electrolyzer at a constant o6iieM rate of 600 l / h.

The electrolyzer operates for three days in the mode of deterministic supply of the feed brine, and then translates

c in the mode of distributed pod1;) and. I

The distribution of sodium chloride concentration in the anolyte is checked, as well as the change in current efficiency during deterministic and distributed feeding of the feed brine.

To check the distribution of sodium chloride concentration at the corner points of the upper and lower parts of the anode space of the electrolyzer, a} samples are taken (olite.

Type of feed brine feed Concentration in feed brine, g / l

  I I 3 14 5 U 7

Determinist bath

Distributed (by the proposed method)

312.7 510.6 307.1 311.3 310.9 314.2 311.4 320.1 325.7 316.2 321.0 332.4 323.3 317.6

five

0

0

The concentration of sodium chloride in the feed brine is determined before and after the sprayer once per shift.

B1.1 current is calculated based on gas analysis and anolyte composition with deterministic and distributed brine test. The results of the experiment are summarized in table 1 and 2.

Thus, due to the distribution of H (1Y supply of feed brine, the concentration gradient of sodium chloride in the volume of ano.chit is significantly reduced.

The maximum difference in concentration of the anolyte volume in anolyte is 11.5 g / l for deterministic feed, and 5.5 g / l for 11 distributed feed.

The average concentration of sodium chloride in the feed brine and the volume of the anolyte increases, respectively, by 9.2 and 10.3 g / l. The increase in current efficiency is 1.3%.

Using the proposed method of obtaining chlorine and caustic soda in electrolyzers with a solid cathode improves the operating conditions of the diaphragm of the ion exchange membrane due to a more uniform distribution of the concentration of sodium chloride in the anolyte, it allows the operation of higher amounts of sodium chloride in the feed jiaccojie and anolyte due to the addition of solnitelles, with the moisture content of the waste water. yurg aza.

Both factors contribute to an increase in current ;; over current, a target is 1x electrolysis products.

Table 1

Feeder feed brine,

Pid iiuMJHHt Concentration in the feed brine, g / l

Deterministic

Distributed by the proposed method

Deterministic Distributed

Note, a, b, c, d - the upper part of the anode space;

e, f, g, h are the lower part of the anode space.

Brine feed type

Concentration of sodium chloride in the anolithic point, g / l

Deterministic Distributed

Compiled by T. Barabash Editor L. Shishkina Tehred M. Khodanych Proofreader

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VPIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Industrial spveino-printing company, Uzhgorod, st. 1 project, 4

Continuation of table 1

313.5 317.0 304.3 308.5 309.2

322.4 327, 1 317.3 313.9 318.4

Table 2

239 235 228 227.5 234.3 234 246.5 245.5 244 245.4 241 242.1

Continuation of table 2

The average concentration of C1 in the anolyte,

g / l

Average current output,%

233 232 242 241.5

233.1 93.5 243.4 94.8

Claims (2)

1. METHOD FOR PRODUCING CHLORINE AND CAUSTIC SODA, including the electrolysis of an aqueous solution of sodium chloride, continuously supplied to the upper part of the anode space of the electrolyzer with a constant volume velocity, characterized in that, in order to increase the current output of the target electrolysis products, the aqueous solution of sodium chloride is uniformly distributed over the entire anolyte surface. 2. The method of pop. ^ characterized in that the supply of an aqueous solution of sodium chloride is carried out by spraying. 12 52 590