The Kinetic Investigation And Optimization Of The Processes Of Larch Arabinogalactane Hydrolysis In The Presence Of Dissolved And Solid Acid Catalysts

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 degrees C) < SBA-15 (150 degrees C) < Amberlyst 15 (150 degrees C) < 0,1M H2SO4 (130 degrees C) < 0,1M HCl (130 degrees 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.