Sulfuric Acid → Sodium Sulfate

Participants

Reaction Steps

Neutral sodium silicate liquor (3.3:1 SiO2 /Na2O ratio, 25% SiO2) 8.5 liters/minute was mixed with dilute sulphuric acid (40% w/w) 3.4 liters/minute to produce a hydrosol with the composition 18.2% SiO2, 12.3% sodium sulphate and 3% excess sulphuric acid. The sol had a setting time of about 3 to 4 minutes at a temperature of 52° C. and was allowed to set on a continuously moving belt. The dimensions and speed of the belt were such that the mean residence time of the hyrogel on the belt was 10 minutes and its production rate 14.0 Kg/min.

Provenance & Evidence