公开(公告)号：US10807940B2

公开(公告)日：2020-10-20

申请号：US16642959

申请日：2017-11-21

Applicant: South China University of Technology

Inventor： Xuehui Li ,  Zhangmin Li ,  Zhenping Cai ,  Jinxing Long ,  Weijie Zhao ,  Hongwei Ma

IPC: C07C67/30 ,  B01J31/02 ,  C07C69/732

Abstract: 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.

公开(公告)号：US20200181058A1

公开(公告)日：2020-06-11

申请号：US16642959

申请日：2017-11-21

Applicant: South China University of Technology

Inventor： Xuehui Li ,  Zhangmin Li ,  Zhenping Cai ,  Jinxing Long ,  Weijie Zhao ,  Hongwei Ma

IPC: C07C67/30 ,  B01J31/02

Abstract: 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.