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| Synthesis of biodiesel from methyl esterification of oleic acid catalyzed by a novel chromium-alginate complexes |
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| KeyWord:sodium alginate solid acid esteri fication biodiesel |
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| Abstract: |
| 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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