METHOD FOR PREPARING P-HYDROXYCINNAMATE BY USING IONIC LIQUID TO CATALYZE LIGNIN

WIPO Patent Application WO/2019/041583

A1

The present invention discloses a method for preparing p-hydroxycinnamate by using an ionic liquid to catalyze lignin. The method comprises the following steps: 1) preparation of a halogen metal salt ionic liquid: preparing the halogen metal salt ionic liquid by reacting an alkylimidazole chloride with a metal chloride by heating the same to 30-80°C while stirring; and 2) catalytic depolymerization of lignin: mixing the halogen metal salt ionic liquid and lignin with an alcohol, and after N2 replacement, heating the solution to 140-200°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 friendliness, 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.

LI XUEHUI (CN)
LI ZHANGMIN (CN)
CAI ZHENPING (CN)
LONG JINXING (CN)
ZHAO WEIJIE (CN)
MA HONGWEI (CN)

PCT/CN2017/112102

March 07, 2019

November 21, 2017

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UNIV SOUTH CHINA TECH (CN)

C07C67/31; C07C69/732; B01J31/02

LI, LIFEN: "application of ionic liquids", vol. 35, no. 2, 30 April 2015 (2015-04-30), pages 163 - 170
YAN, BING: "Understanding Lignin Treatment in Dialkylimidazolium-based Ionic Liquid-water Mixtures", CHINESE MASTER'S THESES FULL-TEXT DATABASE (ENGINEERING SCIENCE AND TECHNOLOGY I, 15 February 2017 (2017-02-15), XP029275402

GUANGZHOU HUAXUE INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)

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