毛竹水解渣木质素氢解制备芳香化学品

Aromatic Chemicals Produced by Hydrogenolysis of Lignin Extracted from Phyllostachys heterocycla Hydrolysis Residues

以毛竹水解渣为原料,分别采用过氧化氢法和甲醇法提取木质素,在相同的反应条件下对比了两种木质素转化及产物分布的结果,并进一步优化了过氧化氢法提取的木质素的氢解转化最优条件。研究结果表明:温度为220℃,反应时间60min时,过氧化氢木质素可以全部转化为可溶物,单体收率为14.85%;甲醇法提取的甲醇木质素,转化产物中可溶物收率为96.8%,单体收率为7.13%。过氧化氢法木质素通过氢解法制芳香族化学品的效率高于甲醇木质素,此外氢解过程可以使过氧化氢木质素六元环非共轭碳氢重新还原成苯环结构,单体芳香产物中的侧链以羰基、羧基、醛基和烷烃取代基为主。

Two kinds of lignin were extracted from moso bamboo(Phyllostachys heterocycla)hydrolysis residue by hydrogen peroxide method and methanol method.The process of catalytic reductive hydrogenolysis was investigated.The results of two kinds of lignin conversion and product distribution were compared at the same reaction temperature and reaction time.Meanwhile,the optimal conditions of hydrogen peroxide lignin conversion were optimized.When the reaction temperature was 220℃,the reaction time was 60 min,lignin extracted by hydrogen peroxide could be converted entirely into soluble substance,and the monomer yield was 14.85%.The soluble substance yield of lignin extracted by methanol method was 96.8%,the monomer yield was 7.13%.The results showed that the conversion efficiency of hydrogen peroxide lignin to aromatic chemicals was higher than that of methanol lignin at reductive hydrogenolysis.The reductive hydrogenolysis process restored the benzoquinone of hydrogen peroxide lignin to the aromatic structure.The side chains in the product were mainly carbonyl,carboxyl,aldehyde,and alkane groups.