• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Energy Conversion & Management >Comparison of transesterification methods for production of biodiesel from vegetable oils and fats
【24h】

Comparison of transesterification methods for production of biodiesel from vegetable oils and fats

机译：用植物油和脂肪生产生物柴油的酯交换方法比较

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Comparative studies on transesterification methods were presented in this work. Biodiesel is obtained from a chemical reaction called transesterification (ester exchange). The reaction converts esters from long chain fatty acids into mono alkyl esters. Chemically, biodiesel commonly is a fatty acid methyl ester. Vegetable oils can be transesterified by heating them with a large excess of anhydrous methanol and an acidic or basic reagent as catalyst. A catalyst is usually used to improve the reaction rate and yield. In a transesterification reaction, a larger amount of methanol was used to shift the reaction equilibrium to the right side and produce more methyl esters as the proposed product. Several aspects including the type of catalyst (alkaline, acid or enzyme), alcohol/vegetable oil molar ratio, temperature, purity of the reactants (mainly water content) and free fatty acid content have an influence on the course of the transesterification. A non-catalytic biodiesel production route with supercritical methanol has been developed that allows a simple process and high yield because of the simultaneous transesterification of triglycerides and methyl esterification of fatty acids. In the catalytic supercritical methanol transesterification method, the yield of conversion rises to 60-90% for the first 1 min.
机译：这项工作介绍了酯交换方法的比较研究。生物柴油是从称为酯交换（酯交换）的化学反应中获得的。该反应将酯从长链脂肪酸转化为单烷基酯。化学上，生物柴油通常是脂肪酸甲酯。植物油可以通过与大量过量的无水甲醇和酸性或碱性试剂作为催化剂加热进行酯交换。通常使用催化剂来提高反应速率和产率。在酯交换反应中，使用大量的甲醇将反应平衡移至右侧，并产生更多的甲酯作为拟议产品。几个方面，包括催化剂的类型（碱性，酸或酶），醇/植物油的摩尔比，温度，反应物的纯度（主要是水含量）和游离脂肪酸含量，都会影响酯交换反应的过程。由于甘油三酸酯的同时酯交换反应和脂肪酸的甲基酯化反应，已开发出一种使用超临界甲醇的非催化生物柴油生产路线，该路线允许简单的过程和高收率。在催化超临界甲醇酯交换法中，前1分钟的转化率提高到60-90％。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号