Method for preparing p-hydroxycinnamate by lignin depolymerization catalyzed with copper

• Main Authors: LI XUEHUI, GUAN JIANYU, LONG JINXING, CAO MINGLONG, WU YUANHAO
• Format: Patent
• Language: Chinese; English
• Published: 28.04.2020
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

The invention discloses a method for preparing p-hydroxycinnamate by lignin depolymerization catalyzed with copper. The method comprises the following steps: by taking lignin as a raw material, addinga copper catalyst and a solvent, performing inert gas replacement, pressurizing to 0.1-2 MPa, then heating to 135-175 DEG C, reacting for 2-6 h while stirring to achieve catalytic degradation on thelignin to obtain a chemical product taking p-hydroxycinnamate as a main product; wherein the solvent is C1-C4 fatty alcohol; the copper catalyst is copper chloride, copper sulfate or copper bromide. The method is simple in process and mild in reaction condition, the target product can be obtained with high selectivity only by 2-6 hours at the temperature of 135-175 DEG C, the yield of the target product is high, and the yield of the p-hydroxycinnamate can reach (40-100) mg/g. 本发明公开了一种铜催化解聚木质素制备对羟基肉桂酸酯的方法；该方法以木质素作为原料，加入铜催化剂，加入溶剂，经惰性的气体置换并充压至0.1-2MPa后，加热到135-175℃，在搅拌下反应2-6h，将木质素催化降解为以对羟基肉桂酸酯为主产物的化学品；所述的溶剂为C1-C4的脂肪醇；所述的铜催