Transesterification of Cottonseed Oil to Biodiesel by Using Heterogeneous Solid Basic Catalysts
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- 作者：Cui Lingfeng ; Xiao Guomin ; Xu Bo ; Teng Guangyuan
- 刊名：Energy & Fuels
- 出版年：2007
- 出版时间：November 2007
- 年：2007
- 卷：21
- 期：6
- 页码：3740 - 3743
- 全文大小：360K
- 年卷期：v.21,no.6(November 2007)
- ISSN：1520-5029
文摘
Alkyl esters of long chain fatty acid are called biodiesel. These esters can be obtained from the transesterification of triglycerides with methanol/ethanol. This work investigated the possibility of using KF/γ-Al2O3 as heterogeneous catalysts for the transesterification of cottonseed oil with methanol. The operation variables used were methanol/oil molar ratio (6:1–18:1), catalyst concentration (1–5 wt %), temperature (50–68 °C), and catalyst type. The biodiesel with the best properties was obtained using a methanol/oil molar ratio of 12:1, catalyst (4%), and 65 °C temperature with the catalyst KF/γ-Al2O3. The strongest basic sites (superbasic) promote the transesterification reaction also at very low temperature (65 °C), while the basic sites of medium strength require higher temperatures to promote the same reaction.