International Energy Outlook 2014. U.S. Energy Information Administration, U.S. Department of Energy, Washington DC, 2014.
Ma, F, Hanna, MA. Biodiesel production: a review. Bioresour Technol 1999, 70:1–15.
Hanna, MA, Isom, L, Campbell, J. Biodiesel: current perspectives and future. J Sci Ind Res 2005, 2005:854–857.
Sheehan, J, Camobreco, V, Duffield, J, Graboski, M, Shapouri, H, Tyson, KS. An overview of biodiesel and petroleum diesel life cycles. Report NREL/TP‐580‐24772. National Renewable Energy Lab, Golden, CO, USA, 2000.
Yee, KF, Tan, TK, Abdullah, AZ, Lee, KT. Life cycle assessment of palm biodiesel: revealing facts and benefits for sustainability. Appl Energy 2009, 86:S189–S196.
Ranganathan, SV, Narasimhan, SL, Muthukumar, K. An overview of enzymatic production of biodiesel. Bioresour Technol 2008, 99:3975–3981.
Jahirul, MI, Rasul, MG, Chowdhury, AA, Ashwath, N. Biofuel production through biomass pyrolysis. Energies 2012, 5:4952–5001.
Demirbas, AH. Yields and heating values of liquid and char from spruce and trunk bark pyrolysis. Energy Source 2006, 27:1367–1373.
Aguado, R, Olazar, M, Gaisan, B, Prieto, R, Bilbao, J. Kinetics of polystyrene pyrolysis in a conical spouted bed reactor. Chem Eng J 2003, 92:91–99.
Sharma, MK, Shah, DO. Introduction to macro‐ and microemulsions. ACS Symp Ser 1983, 272:1–18.
Yusuf, NNAN, Kamarudin, SK, Yaakub, Z. Overview on the current trends in biodiesel production. Energy Convers Manage 2011, 52:2741–2751.
Ali, Y, Hanna, MA. Alternative diesel fuels from vegetable oils. Bioresour Technol 1994, 50:153–163.
Otera, J. Transesterification. Chem Rev 1993, 93:1449–1470.
Meher, LC, Vidya Sagar, D, Naik, SN. Technical aspects of biodiesel production by transesterification – a review. Renewable Sustainable Energy Rev 2006, 10:248–268.
Gryglewicz, S. Rapeseed oil methyl esters preparation using heterogeneous catalysts. Bioresour Technol 1999, 70:249–253.
Canakci, M, Van Gerpen, J. Biodiesel production via acid catalysts. Trans Am Soc Agric Eng 1999, 42:1203–1210.
Briand, D, Dubreuck, E, Galzy, P. Enzymatic fatty esters synthesis in aqueous medium with lipase from Candida Parapsilosis (ashford) langeron and talice. Biotechnol Lett 1994, 16:813–818.
Felizardo, P, Correia, MJN, Raposo, I, Mendes, JF, Berkemeier, R, Bordado, JM. Production of biodiesel from waste frying oils. Waste Manage 2006, 26:487–494.
Lotero, E, Liu, Y, Lopez, DE, Suwannakarn, K, Bruce, DA, Goodwin, JG Jr. Synthesis of biodiesel via acid catalysis. Ind Eng Chem Res 2005, 44:5353–5363.
Lam, MK, Lee, KT, Mohamed, AR. Homogeneous, heterogeneous and enzymatic catalysis for transesterification of high free fatty acid oil (waste cooking oil) to biodiesel: a review. Biotechnol Adv 2010, 28:500–518.
Zabeti, M, Daud, WMAW, Aroua, MK. Activity of solid catalysts for biodiesel production: a review. Fuel Process Technol 2009, 90:770–777.
Kouzu, M, Kasuno, T, Tajika, M, Sugimoto, Y, Yamanaka, S, Hidaka, J. Calcium oxide as a solid base catalyst for transesterification of soybean oil and its application to biodiesel production. Fuel 2008, 87:2798–2806.
Schuchardt, U, Sercheli, R, Vargas, RM. Transesterification of vegetable oils: a review. J Braz Chem Soc 1998, 9:199–210.
Konwar, LJ, Boro, J, Deka, D. Review on latest developments in biodiesel production using carbon‐based catalysts. Renew Sustain Energy Rev 2014, 29:546–564.
Cagniard De La Tour, C. Presentation of some results obtained by the combined action of heat and compression on certain liquids, such as water, alcohol, sulfuric ether, and distilled petroleum spirit. Ann Chim Phys 1822, 21:127–132.
Sunol, AK, Sunol, SG. Substitution of solvents by safer products and processes, supercritical solvents. In: Wypych, G, ed. Solvent Handbook. Ontario, Canada: Chem Tech Pubmishing; 2001, 1419–1458.
Sunol, AK, Sunol, SG, Aslam, N. Supercritical fluid technology – reactions. In: Sunggyu Lee, CW, ed. Encyclopedia of Chemical Processing. New York: CRC Press, Taylor Francis Group; 2005, 2915–2925.
Bunyakiat, K, Makmee, S, Sawangkeaw, R, Ngamprasertsith, S. Continuous production of biodiesel via transesterification from vegetable oils in supercritical methanol. Energy Fuels 2006, 20:812–817.
He, H, Wang, T, Zhu, S. Continuous production of biodiesel fuel from vegetable oil using supercritical methanol process. Fuel 2007, 86:442–447.
Lee, J, Saka, S. Biodiesel production by heterogeneous and supercritical technologies. Bioresour Technol 2010, 101:7191–7200.
Saka, S, Kusdiana, D. Biodiesel fuel from rapeseed oil as prepared in supercritical methanol. Fuel 2001, 80:225–231.
Hiejima, Y, Kajihara, Y, Kohno, H, Yao, M. Dielectric relaxation measurements on methanol up to the supercritical region. J Phys Condens Matter 2001, 13:10307–10320.
Lee, KT, Lim, S, Pang, YL, Ong, HC, Chong, WT. Integration of reactive extraction with supercritical fluids for process intensification of biodiesel production: Prospects and recent advances. Prog Energy Combust Sci 2014, 45:54–78.
Diaz, MS, Espinosa, S, Brignole, EA. Model‐based cost minimization in noncatalytic biodiesel production plants. Energy Fuels 2009, 23:5587–5595.
Marchetti, JM, Errazu, AF. Technoeconomic study of supercritical biodiesel production plant. Energy Convers Manage 2008, 49:2160–2164.
Ngamprasertsith, S, Sawangkeaw, R. Transesterification in supercritical conditions. In: Stoytcheva, M, Montero, G, eds. Biodiesel ‐ Feedstocks and Processing Technologies. Rijeka: InTech; 2011, 247–248.
Haas, MJ, McAloon, AJ, Yee, WC, Foglia, TA. A process model to estimate biodiesel production costs. Bioresour Technol 2006, 97:671–678.
Barnwal, BK, Sharma, MP. Prospects of biodiesel production from vegetable oils in India. Renew Sustain Energy Rev 2005, 9:363–378.
Issariyakul, T, Dalai, AK. Biodiesel from vegetable oils. Renew Sustain Energy Rev 2014, 31:446–471.
Canakci, M. The potential of restaurant waste lipids as biodiesel feedstocks. Bioresour Technol 2007, 98:183–190.
Chhetri, AB, Watts, KC, Islam, MR. Waste cooking oil as an alternate feedstock for biodiesel production. Energies 2008, 1:3–18.
Mittelbach, M, Enzelsberger, H. Transesterification of heated rapeseed oil for extending diesel fuel. J Am Oil Chem Soc 1999, 76:545–550.
Nawar, W. Chemical changes in lipids produced by thermal processing. J Chem Educ 1984, 61:299–302.
Kulkarni, MG, Dalai, AK. Waste cooking oil an economical source for biodiesel: a review. Ind Eng Chem Res 2006, 45:2901–2913.
Demirbas, A. Biodiesel from vegetable oils via transesterification in supercritical methanol. Energy Convers Manage 2002, 43:2349–2356.
Madras, G, Kolluru, C, Kumar, R. Synthesis of biodiesel in supercritical fluids. Fuel 2004, 83:2029–2033.
Hawash, S, Kamal, N, Zaher, F, Kenawi, O, Diwani, E. Biodiesel fuel from jatropha oil via non‐catalytic supercritical methanol. Fuel 2009, 88:579–582.
Demirbas, A. Biodiesel from waste cooking oil via base‐catalyzed and supercritical methanol transesterification. Energy Convers Manage 2009, 50:923–927.
Santana, A, Macaira, J, Larrayoz, MA. Continuous production of biodiesel from vegetable oil using supercritical ethanol/ carbon dioxide mixtures. Fuel Process Technol 2012, 96:214–219.
Micic, RD, Tomic, MD, Kiss, FE, Nikolic‐Djoric, EB, Simikic, MD. Influence of reaction conditions and type of alcohol on biodiesel yields and process economics of supercritical transesterification. Energy Convers Manage 2014, 86:717–726.
Karmakar, A, Karmakar, S, Mukherjee, S. Properties of various plants and animals feedstocks for biodiesel production. Bioresour Technol 2010, 101:7201–7210.
Moser, BR. Biodiesel production, properties, and feedstocks. In: Tomes, D, Lakshmanan, P, Songstad, D, eds. Biofuels ‐ Global impact on Renewable Energy, Production Agriculture, and Technological Advancements. New York: Springer; 2011, 285–347.
Shin, H, Lee, S, Bae, S. Biodiesel production from waste lard using supercritical methanol. J Supercrit Fluids 2012, 61:134–138.
Kusdiana, D, Saka, S. Methyl esterification of free fatty acids of rapeseed oil as treated in supercritical methanol. J Chem Eng Jpn 2001, 34:383–387.
Lebedevas, S, Vaicekauskas, A, Lebedeva, G, Makareviciene, V, Janulis, P, Kazancev, K. Use of waste fats of animal and vegetable origin for the production of biodiesel fuel: quality, motor properties, and emissions of harmful components. Energy Fuels 2006, 20:2274–2280.
Oner, C, Altun, S. Biodiesel production from inedible animal tallow and an experimental investigation of its use as alternative fuel in a direct injection diesel engine. Appl Energy 2009, 86:2114–2120.
Gui, MM, Lee, KT, Bhatia, S. Feasibility of edible oils vs non‐edible oil vs. waste edible oil as biodiesel feedstock. Energy 2008, 33:1646–1653.
Mustafa, B. Potential alternatives to edible oils for biodiesel production: a review of current work. Energy Convers Manage 2011, 52:1479–1492.
Huang, G, Chen, F, Wei, D, Zhang, X, Chen, G. Biodiesel production by microalgal biotechnology. Appl Energy 2010, 87:38–46.
Patil, V, Tran, K, Giselrod, HR. Towards sustainable production of biofuels from microalgae. Int J Mol Sci 2008, 9:1188–1195.
Ahmad, AL, Mat Yasin, NH, Derek, CJC, Lim, JK. Microalgae as a sustainable energy source for biodiesel production: a review. Renew Sustain Energy Rev 2011, 15:584–593.
Mata, TM, Martins, AA, Caetano, NS. Microalgae for biodiesel production and other applications: a review. Renew Sustain Energy Rev 2010, 14:217–232.
Suen, Y, Hubbard, JS, Holzer, G, Tornabene, TG. Total lipid production of the green alga Nannochloropsis Sp. QII under different nitrogen regimes. J Phycol 1987, 23:289–296.
Demirbas, A. Production of biodiesel from algae oils. Energy Source 2008, 31:163–168.
Levine, R, Pinnarat, T, Savage, PE. Biodiesel production from wet algal biomass through in situ lipid hydrolysis and supercritical transesterification. Energy Fuels 2010, 24:5235–5243.
Patil, PD, Gude, VG, Mannarswamy, A, Deng, S, Cooke, P, Munson‐McGee, S, Rhodes, I, Lammers, P, Nirmalakhandan, N. Optimization of direct conversion of wet algae to biodiesel under supercritical methanol conditions. Bioresour Technol 2011, 102:118–122.
Patil, PD, Gude, VG, Mannarswamy, A, Cooke, P, Mirmalakhandan, N, Lammers, P, Deng, S. Comparison of direct transesterification of algal biomass under supercritical methanol and microwave irradiation conditions. Fuel 2012, 97:822–831.
Patil, PD, Reddy, H, Muppaneni, T, Ponnusamy, S, Cooke, P, Schuab, T, Deng, S. Microwave‐mediated non‐catalytic transesterification of algal biomass under supercritical ethanol conditions. J Supercrit Fluids 2013, 79:67–72.
Patil, PD, Reddy, H, Muppaneni, T, Schaub, T, Holguin, FO, Cooke, P, Lammers, P, Nirmalakhandan, N, Li, Y, Lu, X, et al. In situ ethyl ester production from wet algal biomass under microwave‐mediated supercritical ethanol conditions. Bioresour Technol 2013, 139:308–315.
Levine, R, Bollas, A, Savage, PE. Process improvements for the supercritical in situ transesterification of carbonized algal biomass. Bioresour Technol 2013, 136:556–564.
Reddy, HK, Muppaneni, T, Patil, PD, Ponnusamy, S, Cooke, P, Schaub, T, Deng, S. Direct conversion of wet algae to crude biodiesel under supercritical ethanol conditions. Fuel 2014, 115:720–726.
Jazzar, S, Olivares‐Carrilo, P, Rios, AP, de los Marzouki, MN, Acien‐Fernandez, FG, Fernandez‐Sevilla, JM, Molina‐Grima, E, Smaali, E, Queseda‐Medina, J. Direct supercritical methanolysis of wet and dry unwashed marine microalgae (Nannochloropsis gaditana) to biodiesel. Appl Energy 2015, 148:210–219.
Liu, J, Lin, R, Tavlarides, LL. Production of biodiesel from microalgae oil (Chlorella protothecoides) by non‐catalytic transesterification: evaluation of reaction kinetic models and phase behaviour. J Supercrit Fluids 2015, 99:38–50.
Jin, M, Slininger, PJ, Dien, BS, Waghmode, S, Moser, BR, Orjuela, A, Sousa, LdC, Balan, V. Microbial lipid‐based Lignocellulosic biorefinery: feasibility and challenges. Trends Biotechnol 2015, 33:43–54.
Li, Q, Du, W, Liu, D. Perspectives of microbial oils for biodiesel production. Appl Microbiol Biotechnol 2008, 80:749–756.
Molina‐Grima, E, Belarbi, E‐M, Fernandez, FGA, Medina, AR, Chisti, Y. Recovery of microalgal biomass and metabolites: process options and economics. Biotechnol Adv 2003, 20:491–515.
Halim, R, Danquah, MK, Webley, PA. Extraction of oil from microalgae for biodiesel production: a review. Biotechnol Adv 2012, 2012:709–732.
Uduman, N, Qi, Y, Danquah, MK, Forde, GM, Hoadley, A. Dewatering of microalgal cultures: a major bottleneck to algae‐based fuels. J Renew Sustain Energy 2010, 2:012701.
Yanfen, L, Zehao, H, Xiaoqian, M. Energy analysis and environmental impacts of microalgal biodiesel in China. Energy Policy 2012, 45:142–151.
Pushparaj, B, Pelosi, E, Torzillo, G, Materassi, R. Microbial biomass recovery using a synthetic cationic polymer. Bioresour Technol 1993, 43:59–62.
Mercer, P, Armenta, RE. Developments in oil extraction from microalgae. Eur J Lipid Sci Technol 2011, 113:539–547.
Ehimen, EA, Sun, ZF, Carrington, CG. Variables affecting the in situ transesterification of microalgae lipids. Fuel 2010, 89:677–684.
Harun, R, Singh, M, Forde, GM, Danquah, MK. Bioprocess engineering of microalgae to produce a variety of consumer products. Renew Sustain Energy Rev 2010, 14:1037–1047.
Romanik, G, Gilgenast, E, Przyjazny, A, Kaminski, M. Techniques of preparing plant material for chromatographic separation and analysis. J Biochem Biophys Methods 2007, 70:253–261.
Cooney, M, Young, G, Nagle, N. Extraction of bio‐oils from microalgae. Sep Purif Rev 2011, 38:291–325.
Kusdiana, D, Saka, S. Kinetics of transesterification in rapeseed oil to biodiesel fuel as treated in supercritical methanol. Fuel 2001, 80:693–698.
Cao, W, Han, H, Zhang, J. Preparation of biodiesel from soybean oil using supercritical methanol and co‐solvent. Fuel 2005, 84:347–351.
Jin, B, Duan, P, Xu, B, Wang, B, Wang, F, Zhang, L. Lewis acid‐catalyzed in situ transesterification/esterification of microalgae in supercritical ethanol. Bioresour Technol 2014, 162:341–349.
Marulanda, VF, Anitescu, G, Tavlarides, LL. Biodiesel fuels through a continuous flow process of chicken fat supercritical transesterification. Energy Fuels 2010, 24:253–260.
Tan, KT, Gui, MM, Lee, KT, Mohamed, AR. An optimized study of methanol and ethanol in supercritical alcohol technology for biodiesel production. J Supercrit Fluids 2010, 53:82–87.
Vieitez, I, Silva, C, Alckmin, I, Borges, GR, Corazza, FC, Oliveira, JV, Grompone, MA, Jachmanian, I. Effect of temperature on the continuous synthesis of soybean esters under supercritical ethanol. Energy Fuels 2009, 23:558–563.
Imahara, H, Eiji, M, Shusaku, H, Shiro, S. Thermal stability of biodiesel supercritical methanol. Fuel 2008, 87:1–16.
Abbaszadeh, A, Ghobadian, B, Omidkhah, MR, Najafi, G. Current biodiesel production technologies: a comparative review. Energy Convers Manage 2012, 64:138–148.