STUDY OF STRUCTURE OF INDUSTRIAL ACID HYDROLYSIS LIGNIN, OXIDIZED IN THE H2O2-H2SO4 SYSTEM

Products of oxidation of industrial acid hydrolysis lignin in the H2O2-H2SO4 system were studied using C-13 NMR (in solution and solid state), MALDI-MS, and MS(ESI) techniques. Oxidation of hydrolysis lignin leads to the opening of aromatic rings of lignin, yielding carboxylic groups. Alkyl aryl ether linkages (beta-O-4-bonds) between lignin phenyl propane units are not significantly affected by the oxidation. The structure of oxidized hydrolysis lignin is proposed. The basic structural unit of oxidized hydrolysis lignin is a muconic acid derivative.