小球藻热裂解油催化加氢精制研究

以Ni-Co-Pd/γ-Al₂O₃为催化剂,在固定床反应器中研究了小球藻热裂解油的催化加氢精制。在较低加氢压力(2×10⁶ Pa)下考察了加氢温度和氢油比(体积比)对精制生物油的含水率、热值、运动黏度和十六烷值等参数的影响,并对加氢前后油品进行了元素分析和GC-MS分析。结果表明,在2×10⁶ Pa压力下,氢油比为120:1,温度为300 ℃时,精制油收率达89.6%,热值和十六烷值较加氢前分别增加了17.94%和71.2%,黏度下降66.32%。元素分析和GC-MS分析表明,精制生物油的H/C原子比由1.55提高至1.97,氧、氮、硫含量明显降低,脱氧率达到80.46%。精制油中的有机酸、酯、酮、醛的含量明显降低,烷烃和醇醚含量明显增加。

Catalytic hydroprocessing of the fast pyrolysis bio-oil of Chlorella

Catalytic hydroprocessing of the bio-oil obtained through fast pyrolysis of Chlorella was carried out in a bench-scale continuous-flow fixed-bed reactor equipped with a Ni-Co-Pd/γ-Al₂O₃ catalyst. The effects of the hydrogenation temperature and the H/oil molar ratio on the moisture content, calorific value, viscosity and cetane number of the refined bio-oils were investigated at the pressure of 2×10⁶ Pa, It was shown that the yield of the refined oil reached 86.1%, and the calorific value and cetane number were increased by 17.94% and 71.2% respectively, while the viscosity was decreased by 66.32% at the temperature of 300 ℃, the pressure of 2×10⁶ Pa and the H/oil mol ratio of 120. The elemental analysis and GC-MS analysis results of the bio-oil before and after hydrogenation show that the H/C mol ratio was increased from 1.55 to 1.97, while the oxygen, nitrogen and sulfur contents were significantly decreased. The deoxidation degree reached 80.46%. The amounts of organic acids, esters, ketones and aldehyde in the refined oils were obviously decreased, while those of alcohols and alkanes were markedly increased.