Carbonation of Sodium Disilicate During Spray-drying

J. Golob, R. Gabrovšek and A. Horvat

Abstract
Although drying is generally considered as a separation process, the present contribution reports on drying connected with chemical reaction. During spray-drying of sodium disilicate by the help of directly heated air it was found that the presence of CO2 influenced the quality of the product, expressed by the percent of insoluble content. Based on the product and process analysis, equipment was modified to avoid too long exposure of sodium disilicate to CO2 atmosphere. During the shortened exposure time CO2, transfer from gas to solid was limited to surface chemosorption, and CO2 solid diffusion was practically eliminated. As a result a commercial product with low insoluble content was obtained.

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Keywords
Spray drying, sodium silicate, carbonation, waterglass, Carbon dioxide