Method for preparing p-hydroxycinnamate by using ionic liquid for catalytic lignin depolymerization
申请人:South China University of Technology
公开号:US10807940B2
公开(公告)日:2020-10-20
The present invention discloses a method for preparing p-hydroxycinnamate by using an ionic liquid for catalytic lignin depolymerization comprising: 1) preparation of a halogen metal-based ionic liquid: preparing the halogen metal-based ionic liquid by reacting an alkylimidazole chloride with a metal chloride by heating the same to 30° C. to 80° C. with stirring; and 2) catalytic depolymerization of lignin: mixing the halogen metal-based ionic liquid and lignin with an alcohol, and after N2 replacement, heating the solution to 140° C. to 200° C. and reacting the solution for 4-8 h while stirring to prepare high value-added chemicals with p-hydroxycinnamate as a main product. The present invention has advantages of a simple process, mild conditions, environmental kindness, and high selectivity for a main product. The ionic liquid is simple in preparation, has a good atom economy, and is recyclable. Under optimal conditions, the yield of p-hydroxycinnamate can reach 40-80 mg/g.
本发明公开了一种利用离子液体催化木质素解聚制备对羟基肉桂酸盐的方法,包括:1) 制备卤素金属基离子液体:通过将烷基咪唑氯化物与金属氯化物反应制备卤素金属基离子液体,方法是将卤素金属基离子液体加热至 30° C 至 80° C。2) 木质素的催化解聚:将卤素金属基离子液体和木质素与醇混合,置换 N2 后,将溶液加热至 140°C 至 200°C,搅拌反应 4-8 小时,制备以对羟基肉桂酸酯为主要产品的高附加值化学品。本发明具有工艺简单、条件温和、环保、主产品选择性高的优点。离子液体制备简单,原子经济性好,可回收利用。在最佳条件下,对羟基肉桂酸酯的产量可达 40-80 mg/g。