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| 新型海藻酸铬复合物的制备及其催化油酸甲酯化合成生物柴油 |
| Synthesis of biodiesel from methyl esterification of oleic acid catalyzed by a novel chromium-alginate complexes |
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| DOI： |
| 中文关键词: 海藻酸 固体酸 酯化 生物柴油 |
| 英文关键词:sodium alginate solid acid esteri fication biodiesel |
| 基金项目: |
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| 中文摘要: |
| 以海藻酸钠与氯化铬为原料制备出一种价格低廉的新型海藻酸铬复合物，通过XRD、FT-IR、SEM对制备的复合物结构进行表征，并将其应用于催化油酸与甲醇酯化反应制备生物柴油。系统考察了各因素对油酸转化率的影响，并研究了该催化剂在各种酯化反应中的应用。结果表明：廉价、易制备的海藻酸铬复合物固体酸表现出较高的催化活性，在催化剂用量3%（相对于油酸的质量）、油酸与甲醇摩尔比1∶?10、反应温度70?℃、反应时间3 h条件下，油酸转化率达92.2%；催化剂经重复使用5次，油酸的转化率仍高于60%；此外，该催化剂能适用各种长链羧酸与甲醇的酯化反应，表明该催化剂有望用于工业上高酸值原料降酸制备生物柴油。 |
| 英文摘要: |
| With sodium alginate and chromium chloride as raw materials, a novel low-cost chromium-alginate complexes was prepared and its structure was characterized with X-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR) and scanning electron microscopy (SEM). The biodiesel was prepared from oleic acid and methanol catalyzed by the complexes. The effects of the factors on conversion rate of oleic acid and the application of the catalyst in various esterification reactions were studied. The results showed that chromium alginate prepared in a cheap and easy way exhibited high catalytic activity. Under the conditions of dosage of catalyst 3%(based on the mass of oleic acid), molar ratio of oleic acid to methanol 1∶?10, reaction temperature 70?℃ and reaction time 3 h, the conversion rate of oleic acid reached 92.2%. When the catalyst was reused for five times，the conversion rate of oleic acid was still above 60%. In addition, the catalyst could be applied to esterification reaction of various long carbon chain carboxylic acids with methanol, indicating that the catalyst was expected to be used for reducing acid value of material with high acid value to prepare biodiesel in industry. |
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