玉米秸秆磷钨酸催化液化研究

Study on the Liquefaction of Corn Stalk by Using Phosphotungstic Acid as Catalyst

为改进以浓硫酸为催化剂将生物质催化液化转化为生物质资源不利于工业化生产的现状,研究了以磷钨酸为催化剂、聚乙二醇400(PEG400)作为反应介质对玉米秸秆进行液化反应,利用单因素试验以及正交试验考察了料液质量浓度、反应时间、反应温度和催化剂用量对液化反应的影响。结果表明:以磷钨酸为催化剂,聚乙二醇400为液化剂的条件下,在温度为180℃,时间为60 min,料液质量浓度为0.15 g/mL,磷钨酸用量为2%时,液化率可达90.29%。通过使用红外光谱对玉米秸秆以及液化产物的结构进行分析对比,发现液化反应中生成了大量的羟基,并且产生酯类物质。

The practice of catalytic liquefaction of biomass converts biomass resources using sulfuric acid as catalyst is not conducive to industrial production. In order to overcome this shortcomings, the liquefaction of corn stalk catalyzed by phosphotungstic acid in the reaction media of polyethylene glycol 400 （PEG400） was studied. The effects of liquid concentration, reaction time, reaction temperature and catalyst dosage were investigated by single-factor test and orthogonal test. Results showed that liquefaction rate could reach 90.29% under the following conditions： temperature 180℃, reaction time 60 min, material/water concentration 0.15 g/mL and catalyst dosage 2%. At the same time, the IR spectra of corn stalk and liquefaction product were analyzed and compared, which showed that a large number of hydroxyl and esters were generated in the liquefaction