SU1231084A1 - Method of producing ammonium peroxodisulfate - Google Patents

Description

The invention relates to a method for the electrochemical preparation of peroxocompounds, in particular, a method for the electrochemical preparation of ammonium peroxodisulfate (PDSA), which is used as an oxidizing agent in chemistry, metallurgy, photography and other technical fields.

The purpose of the invention is to increase the current efficiency while making the process cheaper.

The drawing shows the dependence of the current output PDSA on the electrode VETA-1700 from the current density.

Example. In a glass cell with a separated anodic and cathodic space and an anode of high-conductive thermoanthracite (BETA), made in the form of a cylinder with a diameter of 1 cm, pour 50 ml of an acidic solution of ammonium sulfate containing 3.3 s / l (.) SO and promoting additive at a concentration of 0.05 m / l. The electrolysis is carried out at a density of 0.3 A / cm, a 2000 K transmission of electricity. The temperature is maintained at C. The current efficiency is calculated by determining the concentration of ammonium peroxodisulfate in the anolyte after electrolysis by back titration with ferric salts. The current output (BT) is 5%.

The study of the dependence of the influence of the concentration of the additive NH4 current ammonium peroxodisulfate was carried out according to an example ..

As can be seen from the table. 1, the maximum current PDSA is achieved at an additive concentration of 0.05-0.1 m /

50-52

60-62 86-87 86-87

Below 0.05 m / l, BT decreases, more than 1% concentration does not increase BT. PDSA, and above 0.6 m / l BT decreases.

The dependence of the W on the current density was studied according to the example, with the difference that the concentration of the additive remained constant and the current density varied. The current efficiency of ammonium peroxodisulfate at a current density of 1 A / cm was 10%, and at 7 A / cm it was 70% (Table 2).

Data on the effect of additive concentration on the current PDAS output are presented in Table. one.

The dependence of the current output PDSA on BETA-1700 on the current density is presented in Table. 2

The data on the effect of current density on the current PDSA output is shown in the drawing. As can be seen from the drawing, the maximum current outputs are achieved in the range of current densities of 0.3-0.65 A / cm. Below 0.3 A / cm, the VT drops sharply, above 0.65 A / cm, there is a noticeable tendency towards a decrease in the current efficiency.

In tab. 3 shows the current efficiency of PDAS on BETA depending on the firing temperature at a current density of 0.5 A / cm and a concentration of 0.1 mol / l.

The use of VETA as an anode material allows the synthesis of PDAS with high current outputs without the use of platinum and metals. Platinum group. High electroconductive thermoanthracite is obtained by simple technology using high temperature anthracite treatment.

 Table

85-86 84-85 70-73

W%

40 80 82828170

W%

70868284878665

Editor E. Kopcha

Compiled by 0. Zobnin

Tehred I.Popovich Proof-reader I. Erdeyi

Order 2526/31 Circulation 615 Subscription

VNIIPI USSR State Committee

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

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

table 2

Table 3

Claims (1)

METHOD FOR PRODUCING AMMONIUM PEROXODISULPHATE Sulfate by electrolysis of an aqueous solution of ammonium sulfate containing sulfuric acid and a promoting additive, characterized in that, in order to increase the current efficiency while reducing the cost of the process, the electrolysis is carried out at the anodes from a highly conductive thermoanthracite of 300-2 ° C, 300 ° C, C, and as a promoting additive, ammonium fluoride is used at a concentration of 0.05-0.6 mol / L at an anode current density of 0.50.65 A / cm ² . SU,. „1231084