[1]李留,陈盈,林金清.三油酸甘油酯与甲醇反应合成生物柴油的热力学分析[J].华侨大学学报(自然科学版),2013,34(4):409-414.[doi:10.11830/ISSN.1000-5013.2013.04.0409]
　LI Liu,CHEN Ying,LIN Jin-qing.Thermodynamic Analysis of Triolein and Methanol Synthesis of Biodiesel[J].Journal of Huaqiao University(Natural Science),2013,34(4):409-414.[doi:10.11830/ISSN.1000-5013.2013.04.0409]
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三油酸甘油酯与甲醇反应合成生物柴油的热力学分析()
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《华侨大学学报（自然科学版）》[ISSN:1000-5013/CN:35-1079/N]

卷:
第34卷
期数:
2013年第4期
页码:
409-414
栏目:
出版日期:
2013-07-20

文章信息/Info

Title:
Thermodynamic Analysis of Triolein and Methanol Synthesis of Biodiesel
文章编号:
1000-5013(2013)04-0409-06
作者:
李留;  陈盈;  林金清
华侨大学 材料科学与工程学院, 福建 厦门 361021
Author(s):
LI Liu;  CHEN Ying;  LIN Jin-qing
College of Material Science and Engineering, Huaqiao University, Xiamen 361021, China
关键词:
生物柴油;  三油酸甘油酯;  甲醇;  酯交换反应;  基团贡献法;  热力学
Keywords:
biodiesel;  triolein;  methanol;  transesterification;  group-contribution mathod;  thermodynamics
分类号:
TQ645.8
DOI:
10.11830/ISSN.1000-5013.2013.04.0409
文献标志码:
A
摘要:
针对三油酸甘油酯与甲醇的3步连续可逆酯交换反应,采用基团贡献法和其他计算方法估算各组分的焓变、熵变、Gibbs自由能变和标准平衡常数,以及在298.15~428.15 K时各值随温度的变化情况.研究结果表明:三油酸甘油酯与甲醇的各步反应和总反应的热效应都不大,第2,3步反应的焓变值随温度变化很小,第1步反应和总反应的焓变随温度升高而增大;3步反应和总反应的Gibbs自由能变都大于零,且随温度升高都呈略有增大的趋势;三步反应和总反应的标准平衡常数都小于1,且第1步反应平衡常数随温度升高略微增大,其余两步反应和总反应平衡常数随温度升高都略有减小.
Abstract:
Estimation methods were used to estimate the formation enthalpy and entropy of each component, and combined with existing literature datum, the equilibrium thermodynamic analysis of triolein and methanol transesterification reaction to the synthesis of biodiesel was performed. The results show that: the thermal effects of each step of triolein with methanol transesterification reactions and the overall reaction are all not significant. The first step shows a slight endothermic reaction, while the other two steps and the overall reaction show slight exothermic reactions. There are no significant changes of enthalpy values in the second and the third step reactions as the temperature changes, while in the first and overall reactions the values increase as temperature increasing. The changes of Gibbs energy of three steps and overall reactions are all positive, which indicate that reactions can not occur spontaneously under standard state. The changes of Gibbs energy of three steps and overall reaction increase when temperature increasing. From 298.15 to 428.15 K, the equilibrium constants of three steps and the overall reaction are all less than 1, which are 0.1 to 0.2, 0.4 to 0.6 and 4×10-4 to 10×10-4 for each step, 3×10-5 to 7×10-5 for overall reaction, respectively. The equilibrium constant of the first step slightly increases as temperature increasing, while the other two steps and overall reaction slightly decrease, which demonstrate that in order to make the reaction spontaneous, the concentration of the methanol should be increased, or the concentration of the product in the reaction system should be reduced.

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备注/Memo

备注/Memo:
收稿日期: 2012-10-29
通信作者: 林金清(1963-),男,教授,主要从事离子液体热力学及其应用的研究.E-mail:linlab@hqu.edu.cn.
基金项目: 国家自然科学基金资助项目(20776057, 21246008); 福建省自然科学基金资助项目(2011J01048)
更新日期/Last Update: 2013-07-20