Decrease of free fatty acid content in vegetable oil using silica supported ferric sulfate catalyst

被引：24

作者：

Dokic, Marko ^{[1
]}

Kesic, Zeljka ^{[1
]}

Krstic, Jugoslav ^{[2
]}

Jovanovic, Dusan ^{[2
]}

Skala, Dejan ^{[1
,2
]}

机构：

[1] Univ Belgrade, Fac Technol & Met, Belgrade 11000, Serbia

[2] Univ Belgrade, Inst Chem Technol & Met, Dept Catalysis & Chem Engn, Belgrade 11000, Serbia

来源：

FUEL | 2012年 / 97卷

关键词：

Free fatty acids; Biodiesel; Esterification; Kinetics; Heterogeneous catalysis; WASTE COOKING OIL; BIODIESEL PRODUCTION; PROCESS DESIGN; ESTERIFICATION; METHANOL; TRANSESTERIFICATION; TRIGLYCERIDES; CONVERSION; KINETICS;

D O I：

10.1016/j.fuel.2012.03.039

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

A difficulty of biodiesel synthesis based on alkaline catalysts obviously exists if free fatty acids (FFAs) content in vegetable oil is above 0.5 wt.%. In this study, the ferric sulfate supported on silica (Fe-2(SO4)(3)/SiO2) was synthesized, activated (at different temperature: 120-600 degrees C) and tested for heterogeneous esterification of FFA (oleic acid) present in sunflower oil (5 wt.%). The catalyst samples were characterized by BET, TG/DTG, XRD and FTIR analyses. Obtained results showed that catalyst activated at 500 degrees C for 2 h in air atmosphere gave the maximal conversion of oleic acid (similar to 97%). Repeated use of catalyst without additional catalyst treatment or re-activation indicated that catalyst posses desired stability and activity. A pseudo-homogeneous kinetic model was proposed with good agreement between calculated and experimental data. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：595 / 602

页数：8

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