小球藻粉水热催化液化制备生物油

为探索新型生物质燃油的开发,该文以小球藻粉为原料,采用水热催化液化方法制备生物油。研究了液化温度,液化时间,催化剂等因素对液化率的影响,在此基础上采用正交试验,以液化率为指标,探讨了生物油优化的制备工艺;利用傅里叶红外光谱(FTIR)和气相色谱-质谱联用(GC/MS)技术分析了小球藻粉生物油的基团结构与组成。结果表明,小球藻粉优化的液化反应条件为:采用质量分数5%的Ce/HZSM-5为催化剂,在300°C水热条件下催化液化20min,小球藻粉和溶剂料液比为1:10g/mL,液化率达39.87%。在此条件下制备的小球藻粉生物油的主要成分为醇类,酯类以及部分碳氢化合物,热值达26.09MJ/kg。和传统木质纤维素类生物质相比,小球藻粉制备的生物油成分更接近传统化石燃油且热值更高,显示了良好的应用前景,为微藻生物质液体燃料的制备提供参考。

Preparation of bio-fuel from Chlorella pyrenoidosa by hydrothermal catalytic liquefaction

A novel hydrothermal catalytic liquefaction process for Chlorella pyrenoidosa was studied in the paper to explore the new resources of bio-fuel. The effects of catalytic liquefaction temperature, reaction time and catalyst on the yield of bio-fuel were investigated, and the reaction conditions were optimized via orthogonal optimization method. The chemical groups and components of final bio-fuel were characterized by Fourier transform infrared spectrometry (FTIR) and gas chromatography/mass spectrometry (GC-MS). The results showed that the optimal reaction was taken place at 300°C for 20 minutes as Ce/HZSM-5 was selected as a catalyst with 5% mass fraction and the volume ratio of Chlorella pyrenoidosa to solvent was 1:10. The maximum liquefaction yield reached to 39.87% and the heating value of final bio-fuel was up to 26.09 MJ/kg. The main components of bio-fuel from Chlorella pyrenoidosa contained alcohol, ester derivatives and some hydrocarbons. Compared with other lignocellulosic bio-fuels, the prepared bio-fuel can be regarded as an alternative diesel fuel because of their similar chemical components and higher heat value. The research is helpful for the preparation of bio-fuel from microalgaes.