HYDROLYTIC DEPOLYMERIZATION OF CORNCOB LIGNIN:PRODUCTS ANALYSIS FOR BIO-BASED RIGID POLYURETHANE FOAM SYNTHESIS

摘要：

　　Corncob lignin was effectively NaOH-catalyzed depolymerized into bio-polyols in isopropanol–water mixture with low molecular weight and suitable hydroxyl number in view of the preparation of bio-based rigid polyurethane foam.The effects of process parameters including the reaction temperature,NaOH concentration,isopropanol–water ratio and reaction time on the product yields were investigated.The products obtained from the depolymerized lignin(DL)were further analyzed by GPC and 31P-NMR.The results showed that 22.1%DL with a low molecular weight(859 g/mol)and a suitable hydroxyl number(5.10 mmol/g)together with 5.1%solid residue was obtained under an optimum condition(at 280 oC,5%NaOH in 50%isopropanol–water ratio for 15 min).In short,this degradation process would effectively produce the bio-polyols,which would have great potential as a substitution of polyol for partial incorporation into rigid polyurethane foam.

作者: Bailiang Xue Xiaojun Shen Runcang Sun

作者单位: College of Bioresources Chemistry and Materials Engineering,Shaanxi University of Science and Techno Beijing Key Laboratory of Lignocellulosic Chemistry,Beijing Forestry University,Beijing 100083,China

会议类型: 国际会议

会议名称: 第五届制浆造纸新技术国际研讨会(ISETPP)暨第三届国际造纸与环境学术大会(IPEC)

会议地点: 广州

会议语种:英文

页码: 1-5

在线出版日期: 2016-11-07（万方平台首次上网日期，不代表论文的发表时间）