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首页> 外文期刊>Journal of Environmental Management >Butanolysis: Comparison of potassium hydroxide and potassium tert-butoxide as catalyst for biodiesel preparing from rapeseed oil
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Butanolysis: Comparison of potassium hydroxide and potassium tert-butoxide as catalyst for biodiesel preparing from rapeseed oil

机译：丁醇分解：氢氧化钾和叔丁醇钾作为菜籽油制备生物柴油催化剂的比较

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摘要

Biodiesel is a mixture of esters of fatty acids (most often palmitic, stearic and oleic) and lower alcohols (in our work butanol) produced by transesterification. It is a renewable source of energy, prepared from triacylglycerides, which are contained in vegetable oils and animal fats. This work focuses on alkaline catalyzed transesterification of rapeseed oil with butanol and comparison of two catalysts (potassium hydroxide and potassiumtert-butoxide). In industry is usually transesterification of rapeseed oil carried out like reaction catalyzed by potassium hydroxide. Potassium hydroxide have high content of K2CO3, KHCO3and water. Moreover water is formed by neutralization of potassium hydroxide with free fatty acids contained in oil. In cause oftert-butoxide catalyzed reaction, it is not possible becausetert-butoxide have not a OH−aniont, which is needed for water forming. The influence of various conditions (addition of water, temperature of separation, intensity of stirring and type of catalyst) on butanolysis process was studied for both catalysts. For both catalysts dependence of conversions on time were plotted. Whentert-butoxide was used, satisfactory phase separation was not achieved. The only way was separation of hot crude reaction mixture without adding water. Ester formed by this method had high content of free glycerol and soaps, but reached higher conversion. The best results were obtained with KOH and subsequent separation of cold crude reaction mixture with the addition of water and slow stirring. The difference between reactions catalyzed by potassium hydroxide and potassiumtert-butoxide was described.
机译：生物柴油是通过酯交换反应生成的脂肪酸（最常见的是棕榈酸，硬脂酸和油酸）和低级醇（在我们的工作中为丁醇）的酯的混合物。它是一种可再生能源，由植物油和动物脂肪中所含的甘油三酸酯制备。这项工作的重点是菜籽油与丁醇的碱催化酯交换反应，以及两种催化剂（氢氧化钾和叔丁醇钾）的比较。在工业上通常是像由氢氧化钾催化的反应那样进行菜籽油的酯交换反应。氢氧化钾具有高含量的碳酸钾，碳酸氢钾和水。此外，水是通过用油中所含的游离脂肪酸中和氢氧化钾而形成的。在叔丁醇催化反应的原因中，这是不可能的，因为叔丁醇没有形成水所需的OH-阴离子。研究了两种催化剂的各种条件（加水，分离温度，搅拌强度和催化剂类型）对丁酸分解过程的影响。对于两种催化剂，绘制了转化率对时间的依赖性。当使用叔丁醇盐时，不能获得令人满意的相分离。唯一的方法是不加水就分离热的粗反应混合物。用这种方法形成的酯具有较高的游离甘油和皂含量，但转化率较高。用KOH和随后加水并缓慢搅拌分离冷的粗制反应混合物可得到最好的结果。描述了氢氧化钾和叔丁醇钾催化的反应之间的差异。

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  • 来源
    《Journal of Environmental Management》 |2018年第15期|555-561|共7页
  • 作者

    Martin Musil; Frantisek Skopal; Martin Hájek; Ales Vavra;

  • 作者单位

    Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice;

    Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice;

    Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice;

    Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice;

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

    Rapeseed oil; Biodiesel; Transesterification; KOH; Separation; Butanol;

    机译：菜籽油;生物柴油;酯交换反应;KOH;分离;丁醇;

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