SU581170A1 - Electrolyte for preparing sodium perborate - Google Patents

Description

54) ELECTROLYTE TO RECEIVE SODIUM PERBORATE

This invention relates to a technology for the production of sodium perborate by an electrochemical method, in particular, to the composition of the electrolyte OLIA for the preparation of sodium perborate. Cabonat-borate electrolyte OLA for the preparation of sodium perborate is known, containing borax and sou. Dichromate and sodium silicate are added as additives to increase the sodium perborate sodium vapor perborate over the current into the electrolyte. Electrolysis is carried out on platinum anoids. The current perborate yield is 69% with an active oxygen concentration of 0.6 g / l Ll3 in the solution. However, this electrolyte is toxic due to the presence of bichromate, in addition, the dichromate impurity reduces the resistance of sodium perborate and gives a yellow tint to both perborate and bleached product consumption is also high — about 2 g per 1 ton of sodium perborate. The most similar in composition to that proposed is an electrolyte containing bora soda, sodium bicarbonate, sodium nitrate and water. Electrolysis is also carried out on platinum and nodes G. A known electrolyte provides a current code of 60-62% with an active oxygen content in O, 78-O, 82 g / l. Platinum consumption - 1, O - 1.1 g per 1 ton of sodium perborate. the creation of an electrolyte that provides a high output of perborate over the current and low consumption of platinum. The goal is achieved by an electrolyte containing borax in the amount of 164 O / l, soda 12 O-14 O g / n, sodium bicarbonate 15-25 g / l, sodium nitrate or magnesium in in terms of ion, 07-0.17 g / l, additionally introduced carbamide 0.10, 2 g / l and water per liter. In this electrolyte, carbamide provides an increase in the output of sodium perborate-to-current by about 5% and, in addition, reduces the consumption of platinum by 2 times. The current perborate of sodium perborate with the content of active oxygen in solution O, 9-O, 91 g / l is 67-67.4%, consumption of platinum O, 5 g per 1 ton of sodium perborate.

Example, Electrolyte, conjugate 130 g / l NojCOj, 15 g / l Na HCOg and -lO g / l N a2. 1 OHjO is subjected to an elctropia with an anode from a pinch grid measuring lOxlO cm from a wire with a 0.2 mm cross section and a katoy made in the form of a step HOii water-cooled box. Electrolyte temperature. 10-12 C, anon density 71) ka 0.8 A / cm I bulk current density

0.4 OD

0.1-0.2 0.1-0.2

.a Wo carbamine O, 1-O, 2 o

0.1-0.2 carbamnt

35 A / n In arughc cases, the electrolysis of noi involves the electrolyte of the indicated composition, in which 0.1-0.2 g / l Mg {Ndj), j or 0; 1-O, 2 g / l M (Koz ) 2 together with O, 1-O, 2 g / l of urea.

The results are presented in table 1.

The data on the solubility of the platinum anode, depending on the composition of the Electrolyte, are presented in Table 2.

Table 1

table 2

2.0

2.0 1.1

1, O

0.5

0.5

The prepared electrolyte provides a high current output (up to 67.4%) at high temperatures, the juice content of active oxygen in the solution (up to 0.90-0.91 g / l), which allows a dramatic increase in perborate removal per unit volume of the solution about 4 times. The consumption of platinum is reduced by 2 times.

Claims (1)

1. US Patent No. 3038842, cl. 024-85, 06.12.1962. 2, USSR author's certificate No. 323942, M. class. In O1 K 1 / OO, 197O.