摘要
通过溶胶-凝胶法制备二氧化硅,进而与氯磺酸反应制得二氧化硅-磺酸(SiO2-SO3H)固体酸催化剂,用于大豆油与乙醇的酯交换反应制备生物柴油,考察了催化剂的处理温度、乙醇与大豆油的摩尔比、催化剂用量、原料油油酸含量和反应时间的影响。结果表明,二氧化硅-磺酸(SiO2-SO3H)具有较高的酯交换反应催化活性。制备生物柴油的最佳条件如下:催化剂处理温度为120℃、醇油摩尔比为6∶1、催化剂质量分数为5.0%(以大豆油计)、正庚烷的质量分数(以大豆油计)为30.0%、反应时间为6.0 h,此时生物柴油产率可达97.84%。与固体碱催化剂相比,固体酸催化剂对原料的酸度有更强的适应性。
The silica,which was prepared by sol-gel method, reacted with chlorosulfonic acid （ClSO3 H） to prepare silica Sulfonic acid（SiO2-SO3H） solid acid catalyst. The catalyst was used for the transesterification of soybean oil and ethanol to form biodiesel. The effect of the treatment temperature of catalyst,the molar ratio of ethanol to oil, the catalyst amount, oleic acid content and reaction time was investigated in detail. The silica sulfonic acid（SiO2-SO3 H） solid acid catalyst showed high activity for transesterification. The yield of ethyl ester reached 97.84% under the optimum conditions as follows, treatment temperature of catalyst 120℃ ,n（ethanol） ： n（oil） 6 ： 1 ,the mass fraction of catalyst in oil 5.0% ,the mass fraction of heptane in oil 30. 0% and refluxing time 6.0 h. The solid acid catalysts have more adaptability than the solid base catalysts when the oil has high acidity.
出处
《化学与生物工程》
CAS
2009年第7期89-92,共4页
Chemistry & Bioengineering
基金
辽宁省教育厅自然科学技术基金资助项目(05L299)
