Abstract
Effects of processing parameters on hydrolysis of TiOSO4 The influence of both TiOSO4 concentrations in the starting solution and a way of conducting hydrolysis on the degree of titanyl sulphate conversion to hydrated titanium dioxide were studied. Titanyl sulphate solution, an intermediate product in the commercial preparation of titanium dioxide pigments by sulphate method, was used. The continuous method of conducting hydrolysis was applied using one or two reactors connected in series. It was found that the degree of hydrolysis markedly depends on the studied parameters. It was also found that TiOSO4 hydrolysis using the continuous method should be conducted: i) at a possibly low concentration of free sulfuric acid in the solution and; ii) in two or more rectors connected in series.
Highlights
Between 1980 and 2005 the worldwide production of titanium dioxide increased by 21.6%
TiO2 pigment is mainly used in paint and varnish industries, but it is widely applied in paper, artificial fibre, plastic, rubber and food industry, where it has contact with products to be later consumed by people
Titanium dioxide found its latest application in electronics where it is used as a ceramic material with dielectric properties as well as in various chemical processes in which it is used as a great photocatalyst
Summary
Between 1980 and 2005 the worldwide production of titanium dioxide increased by 21.6%. In the first experiment the initial concentration of TiOSO4 in the solution was equal to 380 g/dm[3] (H2SO4 186 g/dm3), and the residence time of the mixture in the reactor for 60, 120 and 180 minutes respectively (the rate of dosing the reagents: 8.3 cm3/min, 4.2 cm3/min and 2.8 cm3/min). Substrates were being dosed continuously to the initial reaction mixture, in which the hydrolysis degree of titanyl sulphate amounted to 94% (Figure 1).
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