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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front Chem Sci Eng    2013, Vol. 7 Issue (4) : 401-407    https://doi.org/10.1007/s11705-013-1354-1
RESEARCH ARTICLE
Biodiesel production from waste frying oil in sub- and supercritical methanol on a zeolite Y solid acid catalyst
Jorge MEDINA-VALTIERRA1, Jorge RAMIREZ-ORTIZ2()
1. Department of Chemical & Biochemical Engineering, Aguascalientes Institute of Technology, Aguascalientes, Ags. 20256, México; 2. Academic Unit of Chemical Sciences, Autonomous University of Zacatecas, Zac. 98160, México
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Abstract

Waste frying oil (WFO) is a very important feedstock for obtaining biodiesel at low cost and using WFO in transesterification reactions to produce biodiesel helps eliminate local environmental problems. In this study biodiesel was produced from WFO in sub- and super-critical methanol on a zeolite Y solid acid catalyst. The procedure was optimized using a design of experiments by varying the methanol to WFO molar ratio, the reaction temperature, and the amount of catalyst. Typical biodiesel yields varied from 83 to nearly 100% with methyl esters content ranging from 1.41–1.66 mol·L-1 and typical dynamic viscosities of 22.1-8.2 cP. Gas chromatography was used to determine the molecular composition of the biodiesel. The reaction products contained over 82 wt-% methyl esters, 4.2 wt-% free acids, 13.5 wt-% monoglycerides, and 0.3 wt-% diglycerides. The transesterification of WFO with methanol around its critical temperature combined with a zeolite Y as an acid catalyst is an efficient approach for the production of biodiesel with acceptable yields.

Keywords biodiesel      methanol      critical temperature      waste frying oil      zeolite Y     
Corresponding Author(s): RAMIREZ-ORTIZ Jorge,Email:jramirez@uaz.edu.mx   
Issue Date: 05 December 2013
 Cite this article:   
Jorge MEDINA-VALTIERRA,Jorge RAMIREZ-ORTIZ. Biodiesel production from waste frying oil in sub- and supercritical methanol on a zeolite Y solid acid catalyst[J]. Front Chem Sci Eng, 2013, 7(4): 401-407.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-013-1354-1
https://academic.hep.com.cn/fcse/EN/Y2013/V7/I4/401
Operating variablesCoded symbolRange of levels
Low (1)Center (2)High (3)
Catalyst amount/gA0.10.20.3
Methanol/oil molar ratioB235
Reaction temperature /°CC220240260
Tab.1  Notation used in the design of experiments
Zeolite Y (A) /g0.10.20.3
Methanol/WFO molar ratio (B)235235235
Reaction temperature (C) /°C220
Biodiesel yield /wt-%75.090.090.010093.010095.096.095.0
Viscosity /cP17.618.214.316.814.89.4015.210.59.40
FAME /mol·L-11.571.581.531.561.531.431.541.461.44
240
Biodiesel yield /wt-%82.590.010010096.010087.510095.0
Viscosity /cP22.19.598.1915.916.39.2711.411.910.5
FAME /mol·L-11.521.441.401.551.561.431.481.491.46
260
Biodiesel yield /wt-%95.010090.087.59310082.583.0100
Viscosity /cP10.516.510.58.879.3210.510.59.778.38
FAME /mol·L-11.461.661.421.431.431.461.461.451.41
Tab.2  Matrix of DOE with responses for biodiesel production from WFO. Acid catalyst amount (A), the methanol/oil molar ratio (B) and reaction temperature (°C)
Fig.1  3D plots for catalyst-MeOH/Oil molar ratio (a) and catalyst-temperature (b) for biodiesel yield
Fig.2  Typical chromatogram for the 232-W biodiesel sample
Fig.3  FTIR spectra of WFO and biodiesel products (ABC-W)
Range/cm-1Functional groupAssignmentIntensity of WFOIntensity of biodiesel
1183C-C-OAsymmetric stretchingMediumMedium
1200C-C-(O)-CAsymmetric stretchingLowMedium
1700-1800C=OStretchingVery intenseIntense
2800-3000-CH2 and -CH3Symmetric and asymmetric stretchingIntenseVery intense
Tab.3  WFO intensity and biodiesel intensity
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