Catalytic depolymerization of sugarcane bagasse lignin to prepare aromatic oxygenates

Abstract

The present invention relates to a method for producing aromatic group oxygenates by catalytic depolymerization of sugarcane bagasse lignin. The method for preparing aromatic group oxygenates by catalytic depolymerization of bagasse lignin: 1. Nano-layered NiMgFe hydrotalcite Preparation: 2. Use NiMgFe nano-layered composite metal oxide solid base to catalyze the depolymerization of bagasse lignin to prepare aromatic-based oxygenates; 3. After the catalytic depolymerization reaction, centrifuge to separate the residue and hydrotalcite after the reaction to obtain a liquid phase Crude product; 4. Liquid phase After the crude product is extracted and separated, the extractant is removed by a rotary evaporator to obtain a pure liquid phase product, which is an aromatic oxygen-containing compound. The nano single-layer hydrotalcite catalyst prepared by the co-precipitation hydrothermal synthesis method in the invention has high catalytic activity to bagasse lignin, and the depolymerization rate of bagasse lignin can reach more than 90%.

Description

technical field

[0001] The invention relates to the field of high-efficiency catalytic conversion and resource utilization of bagasse lignin, in particular to a method for preparing aromatic oxygen-containing compounds by catalytically depolymerizing bagasse lignin by using nano single-layer NiMgFe hydrotalcite. Background technique

[0002] In nature, lignin is the second largest biomass besides cellulose, and according to statistics, the annual regeneration of lignin can reach 5.0×10 10 Ton. Owing to the oxygen-containing functional groups such as phenolic hydroxyl group, aldehyde group, and carboxyl group in its molecular structure, it becomes a renewable resource capable of producing aromatic-based oxygen-containing compounds. A large amount of bagasse waste is produced in the sugar industry, which is mainly used as fuel. Due to its high oxygen content and low calorific value, direct combustion has caused a serious waste of bagasse resources. Through chemical conversio...

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