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首页> 外文期刊>Energy Conversion & Management >Ultrasonic transesterification of Jatropha curcas L. oil to biodiesel by a two-step process
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Ultrasonic transesterification of Jatropha curcas L. oil to biodiesel by a two-step process

机译：麻疯树油经两步法超声波酯交换为生物柴油

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摘要

Transesterification of high free fatty acid content Jatropha oil with methanol to biodiesel catalyzed directly by NaOH and high-concentrated H_2SO_4 or by two-step process were studied in an ultrasonic reactor at 60 ℃. If NaOH was used as catalyst, biodiesel yield was only 47.2% with saponification problem. With H_2SO_4 as catalyst, biodiesel yield was increased to 92.8%. However, longer reaction time (4 h) was needed and the biodiesel was not stable. A two-step, acid-esterification and base-transesterification process was further used for biodiesel production. It was found that after the first-step pretreatment with H_2SO_4 for 1 h, the acid value of Jatropha oil was reduced from 10.45 to 1.2 mg KOH/g, and subsequently, NaOH was used for the second-step transesterification. Stable and clear yellowish biodiesel was obtained with 96.4% yield after reaction for 0.5 h. The total production time was only 1.5 h that is just half of the previous reported. The two-step process with ultrasonic radiation is effective and time-saving for biodiesel production from Jatropha oil.
机译：在60℃的超声反应器中，研究了NaOH和高浓度H_2SO_4或两步法直接催化高游离脂肪酸麻疯树油与甲醇酯交换合成生物柴油。如果使用NaOH作为催化剂，则生物柴油的产率仅为47.2％，存在皂化问题。以H_2SO_4为催化剂，生物柴油收率提高到92.8％。但是，需要更长的反应时间（4小时），并且生物柴油不稳定。两步的酸-酯化和碱-酯交换工艺被进一步用于生物柴油的生产。发现在用H_2SO_4进行第一步预处理1小时后，麻风树油的酸值从10.45降低到1.2 mg KOH / g，随后将NaOH用于第二步酯交换反应。反应0.5小时后，获得稳定和澄清的淡黄色生物柴油，产率为96.4％。总生产时间仅为1.5小时，仅为先前报道的一半。超声波辐射的两步过程对于从麻疯树油生产生物柴油是有效且省时的。

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  • 来源
    《Energy Conversion & Management》 |2010年第12期|P.2802-2807|共6页
  • 作者

    Xin Deng; Zhen Fang; Yun-hu Liu;

  • 作者单位

    Biomass Group, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, 88 Xuefulu, Kunming, Yunnan Province 650223, China;

    rnBiomass Group, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, 88 Xuefulu, Kunming, Yunnan Province 650223, China;

    rnBiomass Group, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, 88 Xuefulu, Kunming, Yunnan Province 650223, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    jatropha ail; biodiesel; transesterification; esterification; ultrasonic;

    机译：麻风树生物柴油酯交换酯化超音波;

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