SU1109480A1 - Electrolyte for producing sodium perborate - Google Patents

Abstract

ELECTROLYTE TO RECEIVE SODIUM PERBORATE containing borax, soda, sodium bicarbonate, sodium or magnesium nitrate, urea and water. characterized in that in order to reduce the voltage on the electrolyzer while maintaining the current output, it additionally contains sodium chloride and tripolyphosphate with the following ratio of ingredients, g / l: borax 16-40 sodium 120-140 sodium bicarbonate sodium or magnesium nitrate 0.1-0.2 Urea 0.1-0.2 Sodium chloride 0.1-0.2 Sodium tripolyphosphate 0.1-0.2 (L Water Up to 1 l

Description

f

The invention relates to the technology of electrochemical production, in particular to the preparation of peroxide compounds of boron.

A known electrolyte for pollen perborate sodium, containing borax, soda, sodium bicarbonate, sodium nitrate and water fil.

The disadvantage of this electrolyte is high power consumption.

An electrolyte is also known to produce sodium perborate from an aqueous solution containing, g / l; borax 16-40; soda 120-150; sodium bicarbonate 5-35; sodium or magnesium nitrate 0.1-0.2; carbamide 0.1-0.2; water up to a liter of G2.

The disadvantage of this method is the high cost of electricity due to the high voltage on the electrolyzer (3, 7-5.28).

The aim of the invention is to chop the voltage across the electrolyzer while maintaining the current output.

This goal is achieved by the fact that an electrolyte for producing sodium perborate j containing borax, soda, sodium bicarbonate, sodium or magnesium nitrate, urea and water, additionally contains sodium chloride and sodium tripolyphosphate at the next co-dispersion of ingredients., G / l; Bura16-40

Soda120-140

Bicarbonate

sodium 15-35 Nprat sodium or magnesium O 5 i-O 5 2 Urea 0.3-052 Sodium chloride 051-0,2 Sodium tripolyphosphate O, 1-0,2 Water Up to 1 l

The difference of the proposed electrolyte from the known one is the addition of sodium chloride and sodium tripolyphosphate.

Into 1 liter of water, weighed weights: 40 g .b. I 140 g Aa COj j 35 g NaHCOj; g N NOj; 0.2 g of urea; 0.2 g NaC and 052 g sodium tripolyphosphate. The resulting solutions are subjected to electrolysis with an anode of titanium, coated with Platinum 5 and a cathode of steel H18HCOT. The electrolyte temperature is 22 ° C, the overpressure is 1 kgf / cm, the cathode current density is O, A / cM 5 and anodic is 0.34 A / cm.

94802

In the electrolysis process, a voltage is measured which is 5, OOBJ

In 1abl. Table 1 presents the data on the dependence of the voltage on the electrolytes:

From tab. 1, it follows that a decrease in the voltage on the electrodes occurs when two salts are simultaneously contained in the electrolyte; sodium chloride and sodium tripolyphosphate. The presence of only one salt in the electrolyte (sodium chloride or sodium tripolyphosphate) does not reduce the voltage.

The lowest voltage on the electrolyzer 5.00 V is achieved when the cathode is coated with a visible layer of platinum, which is possible with the joint presence of SII sodium chloride and sodium tripolyphosphate 5 the concentration of each salt is 0.2 g / l

The application of the proposed electrolyte makes it possible to conduct electrolysis without. reducing the current output (as can be seen from Table 2J.

PRI mme R 2. Electrolysis are akkhe as in example 1. In the process of snowstroke, the current output is measured.

by the amount of the product obtained.

In tab. 2 presents data on the dependence of the current output on the concentration of the introduced additives.

From tab. 2, it follows that the presence of sodium chloride salts in the electrolyte (o, 10–0.20 g / l) and sodium tripolyphosphate (0.10–0.20 g / l / does not lead to a decrease in the current efficiency of sodium perborate, on the contrary, exit

j-i current in the presence of these salts miscalculation F o increases (by 0.60, 8%;

The preparation of sodium perborate is currently carried out in

, electrolyzers with titanoplatinum anodes and cathodes of alloy steel. The process for the preparation of sodium perborate is accompanied by the anodic dissolution of platinum, which is completely lost because it is removed with the product or sludge. The use of the proposed electrolyte allows precipitation of anodically dissolved platinum on the cathode, which leads to a decrease in the voltage on the electrolyzer.

On the basis of the prNBeder; us: this offer 111 electrolytes according to the standard reprocessing capacity with an extract (.

following advantages: at voltages on a known electrolyzer of 3.75, 2 V, specific energy consumption of 2560-3600 kWh / t, when voltage on the proposed electrolyzer

3.35-4.85 V specific electric power consumption 2320-3360 kW.h / t, i.e. reducing the voltage by 0.35 V reduces the power consumption of the direct current by 240 kW. h / t

Table I

table 2

0.20

Known 40 140

35

0.20

52.4

Claims (1)

No. 581170, class C 25 V 1/32, 1974.. ELECTROLYTE FOR PRODUCTION SODIUM PERBORATE, containing borax, soda, sodium bicarbonate, sodium or magnesium nitrate, carbamide and water, characterized in that, in order to reduce the voltage on the electrolyzer while maintaining the current output, it additionally contains sodium chloride and tripolyphosphate in the following ratio of ingredients, g / l: Borax 16-40 Soda 120-140 Bicarbonate '' 15 -35 sodium Sodium or Magnesium Nitrate Sodium Chloride Sodium Tripolyphosphate Water 0.1-0.2 0.1-0.2 0.1-0.2 0.1-0.2 Up to 1 L