PRODUCTION OF HIGHLY PURE SUBSTANCES, CONTAINING PRECIPITATED SILICON OXIDES, BY MEANS OF ELECTRODIALYSIS Russian patent published in 2015 - IPC B01D61/46 C01B33/141 C01B33/193 D21H19/40 

FIELD: chemistry.

SUBSTANCE: claimed invention relates to suspensions, containing very small amount of salts and containing, at least, one precipitated silicon oxide. Claimed is method of obtaining suspensions which have low content of salts and include, at least, one precipitated silicon oxide, including the following stages: provision of suspension, containing, at least, one precipitated silicon oxide; bringing suspension pH to value 0.5-5, if pH of suspension, obtained at the previous state, is not in the said interval; purification of suspension by means of electrodialysis, with device for electrodialysis including one or more electrodialysis cells, in each of which product-containing area is separated from catholyte-containing area by means of cation-exchange membrane and distance between electrodes constitutes from 2 to 200 mm; and application of potential from 5 to 1000 V. Also claimed are: suspension obtained by said method, cell for electrodialysis and device which contains it, as well as suspension application. Obtained suspensions are suitable for obtaining coatings for paper in manufacturing information carriers with application of inkjet printing or for obtaining dried precipitated silicon oxides.

EFFECT: method makes it possible to obtain suspensions, containing precipitated silicon oxide with content of sodium sulphate lower than 1000 ppm.

21 cl, 1 tbl, 2 ex