- Chemocatalytic Conversion of Cellulosic Biomass to Methyl Glycolate, Ethylene Glycol, and Ethanol
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Production of chemicals and fuels from renewable cellulosic biomass is important for the creation of a sustainable society, and it critically relies on the development of new and efficient transformation routes starting from cellulose. Here, a chemocatalytic conversion route from cellulosic biomass to methyl glycolate (MG), ethylene glycol (EG), and ethanol (EtOH) is reported. By using a tungsten-based catalyst, cellulose is converted into MG with a yield as high as 57.7 C % in a one-pot reaction in methanol at 240 °C and 1 MPa O2, and the obtained MG can be easily separated by distillation. Afterwards, it can be nearly quantitatively converted to EG at 200 °C and to EtOH at 280 °C with a selectivity of 50 % through hydrogenation over a Cu/SiO2 catalyst. By this approach, the fine chemical MG, the bulk chemical EG, and the fuel additive EtOH can all be efficiently produced from renewable cellulosic materials, thus providing a new pathway towards mitigating the dependence on fossil resources.
- Xu, Gang,Wang, Aiqin,Pang, Jifeng,Zhao, Xiaochen,Xu, Jinming,Lei, Nian,Wang, Jia,Zheng, Mingyuan,Yin, Jianzhong,Zhang, Tao
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p. 1390 - 1394
(2017/04/14)
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- Method for preparing from glycolic acid ester from carbohydrate
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The invention provides a method for preparing glycolic acid ester from carbohydrate including cellulose, starch, hemicelluloses, cane sugar, glucose, fructose, fructosan, xylose and soluble xylooligosaccharide and a natural wood fibre raw material containing the above carbohydrate component. According to the method, carbohydrate or the natural wood fibre raw material containing the carbohydrate component used as a reaction material undergoes one-step catalytic conversion in an alcohol solvent of 100-400 DEG C by using one or more than two of tungsten oxide, tungsten sulfide, tungsten chloride, tungsten carbide, tungsten hydroxide, tungsten bronze, tungstic acid, tungstate, metatungstic acid, metatungstate, para-tungstic acid, paratungstate, peroxotungstic acid, peroxotungstate, tungsten-containing heteropoly acid and heteropolytungstate as a catalyst, so as to realize carbohydrate high-selectivity and high-yield preparation of glycolic acid ester. The reaction provided by the invention has remarkably advantages as follows: the raw materials are renewable resources, and atom economy is high.
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Paragraph 0023; 0024-0028
(2017/03/25)
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