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Fatty acid methyl esters from soapstocks with potential use as biodiesel

机译：肥皂原料中的脂肪酸甲酯有可能用作生物柴油

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摘要

Refined vegetable oils are the main feedstocks for biodiesel production presently. However, the source and price of refined vegetable oils always restrict the development of biodiesel industry in many regions. Large amount of cheap soapstocks (SSs) are currently available in oil refining process, which may provide potential feedstocks reservoir. In this paper, one technical route involving acidification, separation of free fatty acids (FFAs) and glycerides through molecular distillation, followed by esterification and transeste-rification, respectively, was proposed for effective conversion of SSs. The acid oil obtained from acidification of SSs was distilled at 180 ℃ to isolate FFAs and glycerides. Esterification was then catalyzed by solid superacid catalyst, SO_4~(2-)/ZrO_2-TiO_2/La~(3+), with a methanol to oil ratio of 15:1, catalyst amount of 5 wt.% and reaction time 4 h at 60 ℃. The conversion efficiency could reach 98.02%. Transesterification with glycerides was also carried out with methanol to oil molar ratio of 5:1 and catalyst (sodium methoxide) amount of 0.6% and reaction time 0.5 h at 55 ℃ The conversion efficiency could reach 97.25%. Purification of transesterification products was operated at the evaporating temperature of 120 ℃. The content of FAME in the distillate was above 95% analysed by gas chromatography-mass spectrometry (GC-MS).
机译：精制植物油是目前生物柴油生产的主要原料。但是，在许多地区，精制植物油的来源和价格始终限制着生物柴油产业的发展。当前，在炼油过程中可以使用大量廉价的肥皂原料（SSs），这可能会提供潜在的原料库。本文提出了一种通过酸化，通过分子蒸馏分离游离脂肪酸（FFA）和甘油酯，然后分别进行酯化和酯基转移的技术路线，以有效地转化SS。将SSs酸化得到的酸性油在180℃下蒸馏，分离出FFA和甘油酯。然后通过固体超强酸催化剂SO_4〜（2-）/ ZrO_2-TiO_2 / La〜（3+）催化酯化反应，甲醇与油的比例为15：1，催化剂用量为5 wt。％，反应时间为4 h在60℃下。转化效率可达到98.02％。在55℃下，甲醇与油的摩尔比为5：1，催化剂（甲醇钠）的量为0.6％，反应时间为0.5h，进行甘油酯的酯交换反应。酯交换产物的纯化在120℃的蒸发温度下进行。通过气相色谱-质谱（GC-MS）分析，馏出物中的FAME含量高于95％。

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  • 来源
    《Energy Conversion & Management》 |2010年第11期|P.2307-2311|共5页
  • 作者

    Yan Li; Xiao-dong Zhang; Li Sun;

  • 作者单位

    Energy Research Institute of Shandong Academy of Sciences, Shandong, Jinan 250014, China;

    Energy Research Institute of Shandong Academy of Sciences, Shandong, Jinan 250014, China;

    Energy Research Institute of Shandong Academy of Sciences, Shandong, Jinan 250014, 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

    fatty acid methyl esters; soapstocks; molecular distillation;

    机译：脂肪酸甲酯;肥皂水;分子蒸馏;

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