Life Cycle Assessment Comparison between Methanol and Ethanol Feedstock for the Biodiesel from Soybean Oil

Authors: Pawit Tangviroon, Apichit Svang-Ariyaskul

Abstract:

As the limited availability of petroleum-based fuel has been a major concern, biodiesel is one of the most attractive alternative fuels because it is renewable and it also has advantages over the conventional petroleum-base diesel. At Present, productions of biodiesel generally perform by transesterification of vegetable oils with low molecular weight alcohol, mainly methanol, using chemical catalysts. Methanol is petrochemical product that makes biodiesel producing from methanol to be not pure renewable energy source. Therefore, ethanol as a product produced by fermentation processes. It appears as a potential feed stock that makes biodiesel to be pure renewable alternative fuel. The research is conducted based on two biodiesel production processes by reacting soybean oils with methanol and ethanol. Life cycle assessment was carried out in order to evaluate the environmental impacts and to identify the process alternative. Nine mid-point impact categories are investigated. The results indicate that better performance on abiotic depletion potential (ADP) and acidification potential (AP) are observed in biodiesel production from methanol when compared with biodiesel production from ethanol due to less energy consumption during the production processes. Except for ADP and AP, using methanol as feed stock does not show any advantages over biodiesel from ethanol. The single score method is also included in this study in order to identify the best option between two processes of biodiesel production. The global normalization and weighting factor based on ecotaxes are used and it shows that producing biodiesel form ethanol has less environmental load compare to biodiesel from methanol.

Keywords: Biodiesel, Ethanol, Life Cycle Assessment, Methanol, Soybean Oil.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1092313

References:

[1] Deming, D., Oil: Are We Running Out? Memoirs-American Association of Petroleum Geologists 2001, 45-56.
[2] Meher, L. C.; Vidya Sagar, D.; Naik, S. N., Technical aspects of biodiesel production by transesterification—a review. Renewable and Sustainable Energy Reviews 2006, 10 (3), 248-268.
[3] Edgar Lotero , Y. L., Dora E. Lopez , Kaewta Suwannakarn , David A. Bruce , and James G. Goodwin , Jr., Synthesis of Biodiesel via Acid Catalysis. Ind. Eng. Chem. Res. 2005, 44 (14), 5353–5363.
[4] Wang, Y.; Ou, S.; Liu, P.; Xue, F.; Tang, S., Comparison of two different processes to synthesize biodiesel by waste cooking oil. Journal of Molecular Catalysis A: Chemical 2006, 252 (1–2), 107-112.
[5] Kiss, A. A., Bildea, C.S., A review of biodiesel production by integrated reactive separation technologies Journal of Chemical Technology and Biotechnology 2012, 87 (7), 861-879.
[6] Noureddini, H.; Zhu, D., Kinetics of transesterification of soybean oil. JAOCS, Journal of the American Oil Chemists' Society 1997, 74 (11), 1457-1463.
[7] Kucek, K. T.; César-Oliveira, M. A. F.; Wilhelm, H. M.; Ramos, L. P., Ethanolysis of refined soybean oil assisted by sodium and potassium hydroxides. JAOCS, Journal of the American Oil Chemists' Society 2007, 84 (4), 385-392.
[8] Mekhilef, S.; Siga, S.; Saidur, R., A review on palm oil biodiesel as a source of renewable fuel. Renewable and Sustainable Energy Reviews 2011, 15 (4), 1937-1949.
[9] Berchmans, H. J.; Hirata, S., Biodiesel production from crude Jatropha curcas L. seed oil with a high content of free fatty acids. Bioresource Technology 2008, 99 (6), 1716-1721.
[10] Jared Whitaker, G. H., Robert Kemerait, Eric Prostko, Phillip Roberts, Nathan Smith, Amanda Smith, Pual Sumner 2013 Georgia Soybean Production Guide; Georgia Agricultural Commodity Commision For Soybean 2013.
[11] Soybean Cultivation Methods. http://sopmoei.maehongson.doae.go.th/ page21.html
[12] Ramadhas, A. S.; Jayaraj, S.; Muraleedharan, C., Biodiesel production from high FFA rubber seed oil. Fuel 2005, 84 (4), 335-340.
[13] Gerhard Knothe, J. V. G., and Jurgen Krahl, Biodiesel Production. AOCS Publishing: 2005.
[14] Arthur, T. Control structure design for methanol process. Norwegian University of Science and Technology, 2010.
[15] Letti, L. A. J.; Karp, S. G.; Woiciechowski, A. L.; Soccol, C. R., Ethanol production from soybean molasses by Zymomonas mobilis. Biomass and Bioenergy 2012, 44, 80-86.
[16] Siqueira, P. F.; Karp, S. G.; Carvalho, J. C.; Sturm, W.; Rodríguez-León, J. A.; Tholozan, J. L.; Singhania, R. R.; Pandey, A.; Soccol, C. R., Production of bio-ethanol from soybean molasses by Saccharomyces cerevisiae at laboratory, pilot and industrial scales. Bioresource Technology 2008, 99 (17), 8156-8163.
[17] Baumann, H., The hitch hiker's guide to LCA Studentlitteratur: Sweden, 2004.
[18] Carlo Hamelinck, S. S., Martin Mittelbach, Julien Verolet, Bart Dehue Fatty acid ethyl esters; Ecofys, Graz University, Iterg: 2007.
[19] Panichelli, L.; Dauriat, A.; Gnansounou, E., Life cycle assessment of soybean-based biodiesel in Argentina for export. International Journal of Life Cycle Assessment 2009, 14 (2), 144-159.
[20] Li, Y.; Griffing, E.; Higgins, M.; Overcash, M., Life cycle assessment of soybean oil production. Journal of Food Process Engineering 2006, 29 (4), 429-445.
[21] Natural Gas 1998: Issues and Trends; Energy Information Administration: 1999.
[22] Administration, U. S. E. I. Form EIA-923 detailed data. http://www.eia.gov/electricity/data/eia923/.
[23] Administration, U. S. E. I. Form EIA-860 detailed data. http://www.eia.gov/electricity/data/eia860/.
[24] Steam End-User Training. US Department of Energy, E. E., and Renewable Energy, Ed. 2010.
[25] Agricultural Commodities Products. http://www.cmegroup.com/trading/ agricultural/.
[26] Heng Hui hui, S. T., Sarah Trinder Global Biodiesel ICIS Pricing 2013.
[27] Glycerine 80%. Reuters, T., Ed.
[28] Sleeswijk, A. W.; van Oers, L. F. C. M.; Guinée, J. B.; Struijs, J.; Huijbregts, M. A. J., Normalisation in product life cycle assessment: An LCA of the global and European economic systems in the year 2000. Science of the Total Environment 2008, 390 (1), 227-240.
[29] Finnveden, G.; Eldh, P.; Johansson, J., Weighting in LCA based on ecotaxes: Development of a mid-point method and experiences from case studies. International Journal of Life Cycle Assessment 2006, 11 (SPEC. ISS. 1), 81-88.