撑蒿竹自催化乙醇法制浆及木质素降解动力学分析

Autocatalytic Ethanol Pulping of Bambusa Pervariabilis and Kinetic Analysis of Lignin Degradation

中文关键词:  撑蒿竹  自催化乙醇法制浆  木质素降解动力学  木质素反应活化能

Key Words:Bambusa pervariabilis  autocatalytic ethanol pulping  lignin degradation kinetics  lignin activation energy

中文摘要:

      研究了撑蒿竹自催化乙醇法制浆过程中保温温度和保温时间对粗浆得率、木质素及其他组分溶出量和木质素转化率的影响规律，并在此基础上分析了木质素的降解动力学。结果表明，在保温阶段前90 min内，温度越高，木质素的转化率越高，浆料中其他组分的脱除主要发生在保温阶段前150 min内，其他组分脱除量随温度升高而增大；木质素的降解反应为一级反应，可分为大量脱木质素（保温阶段前60 min）、少量脱木质素（60~120 min）和残余脱木质素（120~210 min）3个阶段，脱木质素反应活化能分别为24.23、129.1和328.8 kJ/mol。

Abstract:

      The effects of insulation temperature and time on the yield of crude pulp， dissolution of lignin and other components， and conversion rate of lignin in the process of autocatalytic ethanol pulping of Bambusa pervariabilis were studied， during which the degradation kinetics of lignin was investigated. The results showed that the higher the temperature， the greater the conversion rate of lignin during the first 90 min of insulation； the removal of other components from pulp mainly occurred during the first 150 min of insulation with an increase along with increase in the temperature. The degradation of lignin conformed to the first-order reaction and could be divided into three stages： mass delignification （first 60 min of insulation）， small amount of delignification （60~120 min）， and residual delignification （120~210 min） with activation energies of 24.23， 129.1， and 328.8 kJ/mol， respectively.