The influence of the temperature and the reaction time of larch arabinogalactan (AG) hydrolysis in the presence of dissolved mineral acids H₂SO₄ and HCl, as well as solid acid catalysts Amberlyst 15, acid-modified SBA-15 and Sibunit-4 on the rate of formation of arabinose and galactose was studied. The rate constants of monosaccharides formation are increased in the series of catalysts: Sibunit-4 (150 °C) < SBA-15 (150 °C) < Amberlyst 15 (150 °C) < 0,1M H₂SO₄ (130 °C) < 0,1M HCl (130 °C). The activation energy of the reaction of arabinose formation (65-91 kJ/mol) is lower than that of galactose (112-140 kJ /mol). The composition of soluble products of acid hydrolysis of arabinogalactan is studied by gas chromatography.

The process of arabinogalactan hydrolysis in the presence of dissolved and solid acid catalysts was optimized by the calculation methods. The optimal parameters of processes at which a degree of arabinogalactan conversion close to 100 % are established.