Peracetic acid treatment of lignins for selective production of valuable chemiclas

Abstract

This study was conducted to investigate the degradation characteristics of lignin depending on the peracetic acid (PAA) and hydrogen peroxide (HP) concentrations, and to produce the low-molecular weight lignins by controlling the reaction conditions. In addition, reaction conditions for producing the definite products from lignin were investigated. Fractionation of the PAA-treated lignin depending on their molecular weight range was carried out by using open-column with selecting several solvents. <br/> Acetic acid (AA) and HP were mixed at a ratio of 4:1, 1.5:1, 1:1, 1:1.5, and 1:5 (v/v) for preparing the PAA solution. After PAA treatment, the highest solid degradation rates were obtained as 29.0% and 65.3% at 1:1.5 (v/v) for alkali and kraft lignin, respectively. However, degradation characteristics of two lignins were different