1. Key words: acid rain, desulphurization, modelling, neural networks, pollution.

2. By using model of shrinking core, iron oxide desulphurization dynamics in low water without Oxygen is studied by thermo gravimetric analysis.

3. During heating hydrous titanium dioxide with a general empirical formula TiO2·xH2O·ySO3 prepared by hydrolysis of titanium sulphate solution drying, dehydration, desulphurization and anatase — rutile transformation proceed.