Biodiesel synthesis and kinetic analysis based on MnCO3/Na silicate as heterogeneous catalyst(Article)(Open Access)
- aState Key Laboratory of Biogeology and Environmental Geology, School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China
- bFaculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
- cUniversity of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, Belgrade, 11000, Serbia
- dInstitute of Technical Sciences of the Serbian Academy of Sciences and Arts, KnezMihailova35, Belgrade, 11000, Serbia
Abstract
Тhe MnCO3/Na silicate (Mn/Na/Si mole ratio of 4.65:1:1.65) catalyst in the form of solid particles with diameter of 0.99–1.99 mm was used as a catalyst for transesterification of soybean oil in batch autoclave at different conditions: 388–468 K, methanol-to-oil mole ratio 12:1–30:1, catalyst amount based on the mass of oil 0–12.5 %. The complete triacylglycerols (TAG) conversion and high yield of fatty acid methyl ester (FAME) was obtained after 1 h at 458 K, methanol-to-oil mole ratio 30:1 and 10 % of catalyst. Kinetics of transesterification process was analyzed by three models: the simple first order irreversible reaction rate, as well as two more complex models recently reported in literature. The catalyst reuse in transesterification process was tested and the average values of 99.0 % of TAG conversion and 97.5 % of FAME yield were obtained after 8 consecutive runs. Different techniques were used to characterize fresh and used MnCO3/Na silicate catalyst. The determined amounts of leached Na (<500 ppm) and Mn (<20 ppm) in biodiesel phase implied that the homogeneous-heterogeneous process influences the catalyst selectivity, whereby leached Na enables the complete transformation of TAG to FAME.
Funding details
| Funding sponsor | Funding number | Acronym |
|---|---|---|
| Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja | MPNTR | |
| International Science and Technology Cooperation Programme | 2013DFG92250,45001 | ISTCP |
| International Science and Technology Cooperation Programme | ISTCP |
-
1
NOMENCLATURE Pre-exponential factor, min-1 Concentration of TAG, mol L-1 Model parameter, the hypothetic initial FAME concentration corresponding to the initial available amount of TAG close to the active catalyst surface, mol L-1 Catalyst particle diameter, mm Diacylglycerols amount in the FAME/oil fraction of the reaction mixture, % Fatty acid methyl esters amount, % Basic strength of the samples Reaction rate constant up to 423 K, min-1 Reaction rate constant above 423 K, min-1 Apparent reaction rate constant, min-1 Overall triglyceride volumetric mass transfer coefficient, min-1 Model parameter defining the TAG affinity for the catalyst active sites,mol L-1 Monoacylglycerols amount in the FAME/oil fraction of the reaction mixture, % Rate of TAG transesterification, mol min-1 L-1 Time, min Temperature, K Triacylglycerols amount in the FAME/oil fraction of the reaction mixture, % TAG conversion FAME yield, % Fitting parameter in Eq. (9a) Fitting parameter in Eq. (9a) Mass ratio of Na silicate to MnCO3 Acknowledgements. This study was supported by the International S&T Cooperation Program of China (Grant No. 2013DFG92250) as well as the research Grant No. 45001 of the Ministry of Education, Science and Technological Development of the Republic of Serbia.
- ISSN: 03525139
- CODEN: JSCSE
- Source Type: Journal
- Original language: English
- DOI: 10.2298/JSC170612005Z
- Document Type: Article
- Publisher: Serbian Chemical Society
Liu, H.; State Key Laboratory of Biogeology and Environmental Geology, School of Environmental Studies, China University of Geosciences, Wuhan, China;
© Copyright 2021 Elsevier B.V., All rights reserved.
Cited by 3 documents
(2022) Grasas y Aceites
(2019) International Journal of Innovative Technology and Exploring Engineering
(2018) Energy Conversion and Management