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将甲醇、乙醇分别与辛醇混合,按不同比例添加至稻壳生物油中,25℃储存6周,研究加入混合醇后生物油的水分、粘度等随时间的变化,探讨混合醇对生物油稳定性的影响,并与加入单一甲醇或乙醇的生物油进行对比。结果表明:混合醇对减缓生物油水分增长的效果优于单一醇,加入混合醇后,生物油的水分增长率分别为4.85%、4.79%,低于添加单一甲醇或乙醇时的水分增长率(分别为7.66%、7.76%);同时,添加混合醇生物油运动粘度的增长率在4.80%~5.30%之间,低于添加单一醇生物油的6.80%~7.25%。生物油储存(6周)前后的GC-MS分析表明:生物油在加入醇类添加剂后,含量较多的醛酮类物质和羧酸类物质和醇反应,从而抑制了其参与的缩合缩聚反应,同时辛醇对生物油的均相作用减缓了大分子物质的生成,从而提升了生物油的稳定性。
Methanol and ethanol were respectively mixed with octanol and added to rice husk bio-oil in different proportions and stored at 25 ℃ for 6 weeks. The changes of water and viscosity of bio-oil after adding mixed alcohol over time were discussed. Stability, and compared with the addition of a single methanol or ethanol bio-oil. The results showed that the effect of mixed alcohol on slowing the growth of bio-oil was better than that of single alcohol. After adding mixed alcohol, the growth rates of bio-oil were 4.85% and 4.79%, respectively, lower than that of single methanol or ethanol Respectively 7.66% and 7.76%). Meanwhile, the kinematic viscosity of bio-oil added with mixed alcohols increased from 4.80% to 5.30%, which was lower than 6.80% -7.25% of the single-alcohol bio-oil. GC-MS analysis before and after bio-oil storage (6 weeks) showed that after the addition of alcoholic oil, aldehydes and ketones and carboxylic acids with higher content of bio-oil reacted with alcohol to inhibit their participation in condensation-polycondensation reaction , While the homogeneous effect of octanol on bio-oil slowed the formation of macromolecules, thus enhancing the stability of bio-oil.