Kinetics of jatropha oil transesterification catalyzed by modified bentonite and biodiesel purification

被引：0
作者：
School of Chemistry and Chemical Engineering, Guangxi University, Nanning [1 ]
Guangxi
530004, China
不详 [2 ]
Guangxi
530004, China
机构：
[1] School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, Guangxi
[2] School of Environment, Guangxi University, Nanning, 530004, Guangxi
来源：
Huagong Xuebao | / 8卷 / 3113-3119期
基金：
中国国家自然科学基金;
关键词：
Bentonite; Biodiesel; Catalysis; Kinetics; Purification; Solid base; Transesterification;
D O I：
10.11949/j.issn.0438-1157.20150813
中图分类号：
学科分类号：
摘要：
A bentonite catalyst was prepared using acid-treated bentonite modified by calcium hydroxide and sodium hydroxide with wet method, and it was applied in the transesterification of jatropha oil with methanol to form biodiesel. Firstly, the kinetics of this transesterification reaction was studied in the temperature range of 323.15-338.15 K after eliminating both inner and outer diffusion effects. Then, the crude biodiesel from the transesterification was purified using the adsorption of natural bentonite at room temperature, and the effects of bentonite dosage as well as adsorption time on the removal of free glycerin were investigated. The results showed that the conversion of jatropha oil to biodiesel on the prepared catalyst reached 96.7% under the optimized conditions. And the transesterification can be well described using the pseudo-first-order kinetic model with the activation energy of 67.87 kJ·mol-1. The purified product could meet the requirements of European Standard for biodiesel fuel (EN 14214) with the yield of biodiesel over 96%, when the purification process was performed with a bentonite dosage of 3% (mass) and reaction time of 30 min. ©, 2015, Chemical Industry Press. All right reserved.
引用
收藏
页码：3113 / 3119
页数：6
相关论文
共 32 条
  • [1] Shahla S., Ngoh G.C., Yusoff R., The evaluation of various kinetic models for base-catalyzed ethanolysis of palm oil, Bioresource Technol., 104, pp. 1-5, (2011)
  • [2] Gao Y., Yan L., Xin Z., Component confirmation and process of biodiesel produced in supercritical conditions with addition of tiny KOH, CIESC Journal, 64, 2, pp. 683-688, (2013)
  • [3] Ding Y., Sun H., Duan J., Et al., Mesoporous Li/ZrO<sub>2</sub> as a solid base catalyst for biodiesel production from transesterification of soybean oil with methanol, Catal. Commun., 12, 7, pp. 606-610, (2010)
  • [4] Fan M., Zhang P., Ma Q., Enhancement of biodiesel synthesis from soybean oil by potassium fluoride modification of a calcium magnesium oxides catalyst, Bioresource Technol., 104, pp. 447-450, (2012)
  • [5] Akbar E., Binitha N., Yaakob Z., Et al., Preparation of Na doped SiO<sub>2</sub> solid catalysts by the sol-gel method for the production of biodiesel from jatropha oil, Green Chem., 11, 11, pp. 1862-1866, (2009)
  • [6] Li J., Xu H., Fei Z.A., Et al., CaO/NaA combined with enzymatic catalyst for biodiesel transesterification, Catal. Commun., 28, pp. 52-57, (2012)
  • [7] Boz N., Degirmenbasi N., Kalyon D.M., Transesterification of canola oil to biodiesel using calcium bentonite functionalized with K compounds, Appl. Catal. B-Environ., 138-139, pp. 236-242, (2013)
  • [8] Cross H.E., Parkes G., Brown D.R., Microwave calcination of Cu/Mg/Al hydrotalcite catalyst precursor, Appl. Catal. A: General, 429-430, pp. 24-30, (2012)
  • [9] Zhang H., Hu X., Wei T., Et al., Progress of preparation and applications of alkaline Ca-bentonite, Chem. Ind. Eng. Prog., 31, pp. 1395-1401, (2012)
  • [10] Fan X., Zhang D., Huang B., Et al., Preparation of solid base catalyst supported on bentonite and its application in synthesis of biodiesel, Chem. Ind. Eng. Prog., 28, pp. 1951-1954, (2009)
1234