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Ionic liquids and deep eutectic solvents for biodiesel synthesis: a review

  1. Hua Zhao1,*,
  2. Gary A. Baker2

Article first published online: 14 NOV 2012

DOI: 10.1002/jctb.3935

Issue

Journal of Chemical Technology and Biotechnology

Journal of Chemical Technology and Biotechnology

Volume 88, Issue 1, pages 3–12, January 2013

Additional Information

How to Cite

Zhao, H. and Baker, G. A. (2013), Ionic liquids and deep eutectic solvents for biodiesel synthesis: a review. J. Chem. Technol. Biotechnol., 88: 3–12. doi: 10.1002/jctb.3935

Author Information

  1. 1

    Chemistry Program, Savannah State University, Savannah, USA

  2. 2

    Department of Chemistry, University of Missouri-Columbia, Columbia, USA

*Correspondence to: Hua Zhao, Chemistry Program, Savannah State University, Savannah, GA 31404, USA. Email: huazhao98@gmail.com; zhaoh@savannahstate.edu

Publication History

  1. Issue published online: 10 DEC 2012
  2. Article first published online: 14 NOV 2012
  3. Manuscript Accepted: 29 AUG 2012
  4. Manuscript Revised: 15 AUG 2012
  5. Manuscript Received: 1 JUN 2012

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REFERENCES

  • 1
    Fukuda H, Kondo A and Noda H, Biodiesel fuel production by transesterification of oils. J Biosci Bioeng 92:405–416 (2001).
  • 2
    Meher LC, Sagar DV and Naik SN, Technical aspects of biodiesel production by transesterification - a review. Renew Sustain Energy Rev 10:248–268 (2006).
  • 3
    Marchetti JM, Miguel VU and Errazu AF, Possible methods for biodiesel production. Renew Sustain Energy Rev 11:1300–1311 (2007).
  • 4
    Liu B and Zhao Z, Biodiesel production by direct methanolysis of oleaginous microbial biomass. J Chem Technol Biotechnol 82:775–780 (2007).
    Direct Link:
  • 5
    Chisti Y, Biodiesel from microalgae. Biotechnol Adv 25:294–306 (2007).
  • 6
    Du W, Wang L and Liu D, Improved methanol tolerance during Novozym435-mediated methanolysis of SODD for biodiesel production. Green Chem 9:173–176 (2007).
  • 7
    Arizona Chemical Company, http://wwwarizonachemicalcom/en/Sustainability/.
  • 8
    Wang WG, Lyons DW, Clark NN and Gautam M, Emissions from nine heavy trucks fueled by diesel and biodiesel blend without engine modification. Environ Sci Technol 34:933–939 (2000).
  • 9
    van Rantwijk F and Sheldon RA, Biocatalysis in ionic liquids. Chem Rev 107:2757–2785 (2007).
  • 10
    Moniruzzaman M, Nakashima K, Kamiya N and Goto M, Recent advances of enzymatic reactions in ionic liquids. Biochem Eng J 48:295–314 (2010).
  • 11
    Liu C-Z, Wang F, Stiles AR and Guo C, Ionic liquids for biofuel production: opportunities and challenges. Appl Energy 92:406–414 (2012).
  • 12
    Vasudevan PT and Briggs M, Biodiesel production - current state of the art and challenges. J Ind Microbiol Biotechnol 35:421–430 (2008).
  • 13
    Ganesan D, Rajendran A and Thangavelu V, An overview on the recent advances in the transesterification of vegetable oils for biodiesel production using chemical and biocatalysts. Rev Environ Sci Biotechnol 8:367–394 (2009).
  • 14
    Bajaj A, Lohan P, Jha PN and Mehrotra R, Biodiesel production through lipase catalyzed transesterification: an overview. J Mol Catal B: Enzym 62:9–14 (2010).
  • 15
    Bisen PS, Sanodiya BS, Thakur GS, Baghel RK and Prasad GBKS, Biodiesel production with special emphasis on lipase-catalyzed transesterification. Biotechnol Lett 32:1019–1030 (2010).
  • 16
    Gog A, Roman M, Toşa M, Paizs C and Irimie FD, Biodiesel production using enzymatic transesterification – current state and perspectives. Renewable Energy 39:10–16 (2012).
  • 17
    Zhang Y, Dubé MA, McLean DD and Kates M, Biodiesel production from waste cooking oil. 1. Process design and technological assessment. Bioresource Technol 89:1–16 (2003).
  • 18
    Canakci M and Sanli H, Biodiesel production from various feedstocks and their effects on the fuel properties. J Ind Microbiol Biotechnol 35:431–441 (2008).
  • 19
    Li Y, Horsman M, Wu N, Lan CQ and Dubois-Calero N, Biofuels from microalgae. Biotechnol Prog 24:815–820 (2008).
  • 20
    Posten C and Schaub G, Microalgae and terrestrial biomass as source for fuels - a process view. J Biotechnol 142:64–69 (2009).
  • 21
    Taher H, Al-Zuhair S, Al-Marzouqi AH, Haik Y and Farid MM, A review of enzymatic transesterification of microalgal oil-based biodiesel using supercritical technology. Enzyme Res Article ID 468292 (2011).
  • 22
    Halim R, Danquah MK and Webley PA, Extraction of oil from microalgae for biodiesel production: a review. Biotechnol Adv 30:709–732 (2012).
  • 23
    Schuchardt U, Sercheli R and Vargas RM, Transesterification of vegetable oils: a review. J Braz Chem Soc 9:199–210 (1998).
  • 24
    Formo MW, Ester reactions of fatty materials. J Am Oil Chem Soc 31:548–559 (1954).
  • 25
    Freedman B, Pryde EH and Mounts TL, Variables affecting the yields of fatty esters from transesterified vegetable oils. J Am Oil Chem Soc 61:1638–1643 (1984).
  • 26
    Vicente G, Martínez M and Aracil J, Integrated biodiesel production: a comparison of different homogeneous catalysts systems. Bioresource Technol 92:297–305 (2004).
  • 27
    Canakci M and Van Gerpen J, Biodiesel production from oils and fats with high free fatty acids. Trans ASAE 44:1429–1436 (2001).
  • 28
    Liu Y, Lotero E, Goodwin JG and Lu C, Transesterification of triacetin using solid Brønsted bases. J Catal 246:428–433 (2007).
  • 29
    Chai F, Cao F, Zhai F, Chen Y, Wang X and Su Z, Transesterification of vegetable oil to biodiesel using a heteropolyacid solid catalyst. Adv Synth Catal 349:1057–1065 (2007).
    Direct Link:
  • 30
    Abreu FR, Alves MB, Macêdo CCS, Zara LF and Suarez PAZ, New multi-phase catalytic systems based on tin compounds active for vegetable oil transesterificaton reaction. J Mol Catal A Chem 227:263–267 (2005).
  • 31
    Abreu FR, Lima DG, Hamú EH, Einloft S, Rubim JC and Suarez PAZ, New metal catalysts for soybean oil transesterification. J Am Oil Chem Soc 80:601–604 (2003).
  • 32
    Toda M, Takagaki A, Okamura M, Kondo JN, Hayashi S, Domen K and Hara M, Green chemistry: biodiesel made with sugar catalyst. Nature 438:178 (2005).
  • 33
    DaSilveira Neto BA, Alves MB, Lapis AAM, Nachtigall FM, Eberlin MN, Dupont J and Suarez PAZ, 1-n-Butyl-3-methylimidazolium tetrachloro-indate (BMI.InCl4) as a media for the synthesis of biodiesel from vegetable oils. J Catal 249:154–161 (2007).
  • 34
    Lapis AAM, de Oliveira LF, Neto BAD and Dupont J, Ionic liquid supported acid/base-catalyzed production of biodiesel. ChemSusChem 1:759–762 (2008).
    Direct Link:
  • 35
    Demirbas A, Biodiesel production from vegetable oils via catalytic and non-catalytic supercritical methanol transesterification methods. Prog Energy Combust Sci 31:466–487 (2005).
  • 36
    Saka S and Kusdiana D, Biodiesel fuel from rapeseed oil as prepared in supercritical methanol. Fuel 80:225–231 (2001).
  • 37
    Kusdiana D and Saka S, Kinetics of transesterification in rapeseed oil to biodiesel fuel as treated in supercritical methanol. Fuel 80:693–698 (2001).
  • 38
    He H, Wang T and Zhu S, Continuous production of biodiesel fuel from vegetable oil using supercritical methanol process. Fuel 86:442–447 (2007).
  • 39
    Wu Q, Chen H, Han M, Wang D and Wang J, Transesterification of cottonseed oil catalyzed by bronsted acidic ionic liquids. Ind Eng Chem Res 46:7955–7960 (2007).
  • 40
    Han M, Yi W, Wu Q, Liu Y, Hong Y and Wang D, Preparation of biodiesel from waste oils catalyzed by a Bronsted acidic ionic liquid. Bioresource Technol 100:2308–2310 (2009).
  • 41
    Liang X, Gong G, Wu H and Yang J, Highly efficient procedure for the synthesis of biodiesel from soybean oil using chloroaluminate ionic liquid as catalyst. Fuel 88:613–616 (2009).
  • 42
    Akoh CC, Chang SW, Lee G-C and Shaw J-F, Enzymatic approach to biodiesel production. J Agric Food Chem 55:8995–9005 (2007).
  • 43
    Zhao X, El-Zahab B, Brosnahan R, Perry J and Wang P, An organic soluble lipase for water-free synthesis of biodiesel. Appl Biochem Biotechnol 143:236–243 (2007).
  • 44
    Shimada Y, Watanabe Y, Sugihara A and Tominaga Y, Enzymatic alcoholysis for biodiesel fuel production and application of the reaction to oil processing. J Mol Catal B: Enzym 17:133–142 (2002).
  • 45
    Shimada Y, Watanabe Y, Samukawa T, Sugihara A, Noda H, Fukuda H and Tominaga Y, Conversion of vegetable oil to biodiesel using immobilized Candida antarctica lipase. J Am Oil Chem Soc 76:789–793 (1999).
  • 46
    Du W, Xu Y, Liu D and Zeng J, Comparative study on lipase-catalyzed transformation of soybean oil for biodiesel production with different acyl acceptors. J Mol Catal B: Enzym 30:125–129 (2004).
  • 47
    Modi MK, Reddy JRC, Rao BVSK and Prasad RBN, Lipase-mediated conversion of vegetable oils into biodiesel using ethyl acetate as acyl acceptor. Bioresource Technol 98:1260–1264 (2007).
  • 48
    Iso M, Chen B, Eguchi M, Kudo T and Shrestha S, Production of biodiesel fuel from triglycerides and alcohol using immobilized lipase. J Mol Catal B: Enzym 16:53–58 (2001).
  • 49
    Royon D, Daz M, Ellenrieder G and Locatelli S, Enzymatic production of biodiesel from cotton seed oil using t-butanol as a solvent. Bioresource Technol 98:648–653 (2007).
  • 50
    Wasserscheid P and Welton T, Ionic Liquids in Synthesis. Wiley-VCH, Weinheim (2008).
  • 51
    Jain N, Kumar A, Chauhan S and Chauhan SMS, Chemical and biochemical transformations in ionic liquids. Tetrahedron 61:1015–1060 (2005).
  • 52
    Zhao H and Malhotra SV, Applications of ionic liquids in organic synthesis. Aldrichimica Acta 35:75–83 (2002).
  • 53
    Domínguez de María P, Ionic Liquids in Biotransformations and Organocatalysis: Solvents and Beyond. Wiley, New York (2012).
  • 54
    Endres F and Welton T, Inorganic synthesis, in Ionic Liquids in Synthesis, ed by Wasserscheid P and Welton T. Wiley-VCH Verlag, Weinheim, 289–318 (2008).
  • 55
    Kubisa P, Application of ionic liquids as solvents for polymerization processes. Prog Polymer Sci 29:3–12 (2004).
  • 56
    Brennecke JF, and Maginn EJ, Purification of gas with liquid ionic compounds. US 6,579,343 (2003).
  • 57
    Zhao H, Innovative applications of ionic liquids as ‘green’ engineering liquids. Chem Eng Commun 193:1660–1677 (2006).
  • 58
    Zhao H, Methods for stabilizing and activating enzymes in ionic liquids - a review. J Chem Technol Biotechnol 85:891–907 (2010).
    Direct Link:
  • 59
    Tang S, Baker GA and Zhao H, Ether- and alcohol-functionalized task-specific ionic liquids: attractive properties and applications. Chem Soc Rev 41:4030–4066 (2012).
  • 60
    Earle MJ, Plechkova NV and Seddon KR, Green synthesis of biodiesel using ionic liquids. Pure Appl Chem 81:2045–2057 (2009).
  • 61
    Ha SH, Lan MN, Lee SH, Hwang SM and Koo Y-M, Lipase-catalyzed biodiesel production from soybean oil in ionic liquids. Enzyme Microbiol Technol 41:480–483 (2007).
  • 62
    Sunitha S, Kanjilal S, Reddy PS and Prasad RBN, Ionic liquids as a reaction medium for lipase-catalyzed methanolysis of sunflower oil. Biotechnol Lett 29:1881–1885 (2007).
  • 63
    Gamba M, Lapis AAM and Dupont J, Supported ionic liquid enzymatic catalysis for the production of biodiesel. Adv Synth Catal 350:160–164 (2008).
    Direct Link:
  • 64
    Arai S, Nakashima K, Tanino T, Ogino C, Kondo A and Fukuda H, Production of biodiesel fuel from soybean oil catalyzed by fungus whole-cell biocatalysts in ionic liquids. Enzyme Microbiol Technol 46:51–55 (2010).
  • 65
    Yang Z, Zhang K-P, Huang Y and Wang Z, Both hydrolytic and transesterification activities of Penicillium expansum lipase are significantly enhanced in ionic liquid [BMIm][PF6]. J Mol Catal B: Enzyme 63:23–30 (2010).
  • 66
    Zhao H, Song Z, Olubajo O and Cowins JV, New ether-functionalized ionic liquids for lipase-catalyzed synthesis of biodiesel. Appl Biochem Biotechnol 162:13–23 (2010).
  • 67
    Ruzich NI and Bassi AS, Investigation of enzymatic biodiesel production using ionic liquid as a co-solvent. Canadian J Chem Eng 88:277–282 (2010).
  • 68
    Ruzich NI and Bassi AS, Investigation of lipase-catalyzed biodiesel production using ionic liquid [BMIM][PF6] as a co-solvent in 500 ml jacketed conical and shake flask reactors using triolein or waste canola oil as substrates. Energy Fuels 24:3214–3222 (2010).
  • 69
    Ruzich NI and Bassi AS, Proposed kinetic mechanism of biodiesel production through lipase catalysed interesterification with a methyl acetate acyl acceptor and ionic liquid [BMIM][PF6] co-solvent. Canadian J Chem Eng 89:166–170 (2011).
    Direct Link:
  • 70
    Ha SH, Lan MN and Koo Y-M, Continuous production and in situ separation of fatty acid ester in ionic liquids. Enzyme Microbiol Technol 47:6–10 (2010).
  • 71
    Lozano P, Bernal JM, Piamtongkam R, Fetzer D and Vaultier M, One-phase ionic liquid reaction medium for biocatalytic production of biodiesel. ChemSusChem 3:1359–1363 (2010).
    Direct Link:
  • 72
    De Diego T, Manjón A, Lozano P and Iborra JL, A recyclable enzymatic biodiesel production process in ionic liquids. Bioresource Technol 102:6336–6339 (2011).
  • 73
    De Diego T, Manjón A, Lozano P, Vaultier M and Iborra JL, An efficient activity ionic liquid-enzyme system for biodiesel production. Green Chem 13:444–451 (2011).
  • 74
    Lozano P, Bernal JM and Vaultier M, Towards continuous sustainable processes for enzymatic synthesis of biodiesel in hydrophobic ionic liquids/supercritical carbon dioxide biphasic systems. Fuel 90:3461–3467 (2011).
  • 75
    Yu D, Wang C, Yin Y, Zhang A, Gao G and Fang X, A synergistic effect of microwave irradiation and ionic liquids on enzyme-catalyzed biodiesel production. Green Chem 13:1869–1875 (2011).
  • 76
    Zhang K-P, Lai J-Q, Huang Z-L and Yang Z, Penicillium expansum lipase-catalyzed production of biodiesel in ionic liquids. Bioresource Technol 102:2767–2772 (2011).
  • 77
    Liu Y, Chen D, Yan Y, Peng C and Xu L, Biodiesel synthesis and conformation of lipase from Burkholderia cepacia in room temperature ionic liquids and organic solvents. Bioresource Technol 102:10414–10418 (2011).
  • 78
    de los Ríos AP, Hernández Fernández FJ, Gómez D, Rubio M and Víllora G, Biocatalytic transesterification of sunflower and waste cooking oils in ionic liquid media. Process Biochem 46:1475–1480 (2011).
  • 79
    Devi BLAP, Guo Z and Xu X, Characterization of ionic liquid-based biocatalytic two-phase reaction system for production of biodiesel. AIChE J 57:1628–1637 (2011).
    Direct Link:
  • 80
    Lai J-Q, Hu Z-L, Wang P-W and Yang Z, Enzymatic production of microalgal biodiesel in ionic liquid [BMIm][PF6]. Fuel 95:329–333 (2012).
  • 81
    Lozano P, García-Verdugo E, Bernal JM, Izquierdo DF, Burguete MI, Sánchez-Gómez G and Luis SV, Immobilised lipase on structured supports containing covalently attached ionic liquids for the continuous synthesis of biodiesel in scCO2. ChemSusChem 5:790–798 (2012).
    Direct Link:
  • 82
    Zhang L, Xian M, He Y, Li L, Yang J, Yu S and Xu X, A Brønsted acidic ionic liquid as an efficient and environmentally benign catalyst for biodiesel synthesis from free fatty acids and alcohols. Bioresource Technol 100:4368–4373 (2009).
  • 83
    Liang X and Yang J, Synthesis of a novel multi –SO3H functionalized ionic liquid and its catalytic activities for biodiesel synthesis Green Chem 12:201–204 (2010).
  • 84
    Li K-X, Chen L, Yan Z-C and Wang H-L, Application of pyridinium ionic liquid as a recyclable catalyst for acid-catalyzed transesterification of Jatropha oil. Catal Lett 139:151–156 (2010).
  • 85
    Guo F, Fang Z, Tian X-F, Long Y-D and Jiang L-Q, One-step production of biodiesel from Jatropha oil with high-acid value in ionic liquids. Bioresource Technol 102:6469–6472 (2011).
  • 86
    Elsheikh YA, Man Z, Bustam MA, Yusup S and Wilfred CD, Brønsted imidazolium ionic liquids: synthesis and comparison of their catalytic activities as pre-catalyst for biodiesel production through two stage process. Energy Conversion Manage 52:804–809 (2011).
  • 87
    Ghiaci M, Aghabarari B, Habibollahi S and Gil A, Highly efficient Brønsted acidic ionic liquid-based catalysts for biodiesel synthesis from vegetable oils. Bioresource Technol 102:1200–1204 (2011).
  • 88
    Ghiaci M, Aghabarari B and Gil A, Production of biodiesel by esterification of natural fatty acids over modified organoclay catalysts. Fuel 90:3382–3389 (2011).
  • 89
    Zhou J, Lu Y, Huang B, Huo Y and Zhang K, Preparation of biodiesel from tung oil catalyzed by sulfonic-functional Brønsted acidic ionic liquids. Adv Mater Res 314–316:1459–1462 (2011).
  • 90
    Fang D, Yang J and Jiao C, Dicationic ionic liquids as environmentally benign catalysts for biodiesel synthesis. ACS Catal 1:42–47 (2011).
  • 91
    Zhou S, Liu L, Wang B, Xu F and Sun RC, Biodiesel preparation from transesterification of glycerol trioleate catalyzed by basic ionic liquids. Chinese Chem Lett 23:379–382 (2012).
  • 92
    Abbott AP, Capper G, Davies DL, Rasheed RK and Tambyrajah V, Novel solvent properties of choline chloride/urea mixtures. Chem Commun 70–71 (2003).
  • 93
    Abbott AP, Boothby D, Capper G, Davies DL and Rasheed RK, Deep eutectic solvents formed between choline chloride and carboxylic acids: versatile alternatives to ionic liquids. J Am Chem Soc 126:9142–9147 (2004).
  • 94
    Abbott AP, Capper G and Gray S, Design of improved deep eutectic solvents using hole theory. ChemPhysChem 7:803–806 (2006).
  • 95
    Abbott AP, Capper G, Davies DL, Munro HL, Rasheed RK and Tambyrajah V, Preparation of novel, moisture-stable, Lewis-acidic ionic liquids containing quaternary ammonium salts with functional side chains. Chem Commun 2010–2011 (2001). Data missing
  • 96
    Abbott AP, Capper G, Davies DL and Rasheed R, Ionic liquids based upon metal halide/substituted quaternary ammonium salt mixtures. Inorg Chem 43:3447–3452 (2004).
  • 97
    Wang H, Jing Y, Wang X, Yao Y and Jia Y, Ionic liquid analogous formed from magnesium chloride hexahydrate and its physico-chemical properties. J Mol Liq 163:77–82 (2011).
  • 98
    Maugeri Z and Domínguez de María P, Novel choline-chloride-based deep-eutectic-solvents with renewable hydrogen bond donors: levulinic acid and sugar-based polyols. RSC Advances 2:421–425 (2012).
  • 99
    Abbott AP, Capper G, Swain BG and Wheeler DA, Electropolishing of stainless steel in an ionic liquid. Trans Inst Metal Finishing 83:51–53 (2005).
  • 100
    Hou Y, Gu Y, Zhang S, Yang F, Ding H and Shan Y, Novel binary eutectic mixtures based on imidazole. J Mol Liq 143:154–159 (2008).
  • 101
    Abbott AP, Cullis PM, Gibson MJ, Harris RC and Raven E, Extraction of glycerol from biodiesel into a eutectic based ionic liquid. Green Chem 9:868–872 (2007).
  • 102
    Blusztajn JK, Choline, a vital amine. Science 281:794–795 (1998).
  • 103
    Petkovic M, Ferguson JL, Gunaratne HQN, Ferreira R, Leitão MC, Seddon KR, Rebelo LPN and Pereira CS, Novel biocompatible cholinium-based ionic liquids - toxicity and biodegradability. Green Chem 12:643–649 (2010).
  • 104
    Abbott AP, Capper G, McKenzie KJ and Ryder KS, Electrodeposition of zinc–tin alloys from deep eutectic solvents based on choline chloride. J Electroanal Chem 599:288–294 (2007).
  • 105
    Haerens K, Matthijs E, Chmielarz A and Van der Bruggen B, The use of ionic liquids based on choline chloride for metal deposition: a green alternative? J Environ Manage 90:3245–3252 (2009).
  • 106
    Abbott AP and McKenzie KJ, Application of ionic liquids to the electrodeposition of metals. Phys Chem Chem Phys 8:4265–4279 (2006).
  • 107
    Abbott AP, Ryder KS and König U, Electrofinishing of metals using eutectic based ionic liquids. Trans Inst Metal Finishing 86:196–204 (2008).
  • 108
    Endres F, MacFarlane DR and Abbott AP, Electrodeposition from Ionic Liquids. Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim (2008).
  • 109
    Long T, Deng Y, Gan S and Chen J, Application of choline chloride·xZnCl2 ionic liquids for preparation of biodiesel. Chin J Chem Eng 18:322–327 (2010).
  • 110
    Isahak WNRW, Ismail M, Jahim JM, Salimon J and Yarmo MA, Transesterification of palm oil by using ionic liquids as a new potential catalyst. Trends Appl Sci Res 6:1055–1062 (2011).
  • 111
    Zhao H, Baker GA and Holmes S, New eutectic ionic liquids for lipase activation and enzymatic preparation of biodiesel. Org Biomol Chem 9:1908–1916 (2011).
  • 112
    Zhao H, Zhang C and Crittle TD, Choline-based deep eutectic solvents for enzymatic preparation of biodiesel from soybean oil. J Mol Catal B: Enzym: doi: 10.1016/j.molcatb.2012.09.003 (2013).
  • 113
    Young G, Nippgen F, Titterbrandt S and Cooney MJ, Lipid extraction from biomass using co-solvent mixtures of ionic liquids and polar covalent molecules. Sep Purif Technol 72:118–121 (2010).
  • 114
    Kim Y-H, Choi Y-K, Park J, Lee S, Yang Y-H, Kim HJ, Park T-J, Kim YH and Lee SH, Ionic liquid-mediated extraction of lipids from algal biomass. Bioresource Technol 109:312–315 (2012).
  • 115
    Manic MS, Najdanovic-Visak V, Nunes da Ponte M and Visak ZP, Extraction of free fatty acids from soybean oil using ionic liquids or poly(ethyleneglycol)s. AIChE J 57:1344–1355 (2011).
    Direct Link:
  • 116
    Hayyan M, Mjalli FS, Hashim MA and AlNashef IM, A novel technique for separating glycerine from palm oil-based biodiesel using ionic liquids. Fuel Process Technol 91:116–120 (2010).
  • 117
    Shahbaz K, Mjalli FS, Hashim MA and ALNashef IM, Using deep eutectic solvents for the removal of glycerol from palm oil-based biodiesel. J Appl Sci 10:3349–3354 (2010).
  • 118
    Shahbaz K, Mjalli FS, Hashim MA and AlNashef IM, Using deep eutectic solvents based on methyl triphenyl phosphunium bromide for the removal of glycerol from palm-oil-based biodiesel. Energy Fuels 25:2671–2678 (2011).
  • 119
    Li M, Pham PJ, Wang T, Pittman CU and Li T, Solid phase extraction and enrichment of essential fatty acid methyl esters from soy-derived biodiesel by novel π-complexing sorbents. Bioresource Technol 100:6385–6390 (2009).
  • 120
    Pham PJ, Pittman CU, Li T and Li M, Selective extraction of polyunsaturated triacylglycerols using a novel ionic liquid precursor immobilized on a mesoporous complexing adsorbent. Biotechnol Prog 25:1419–1426 (2009).
    Direct Link:
  • 121
    Zhao H, Baker GA, Song Z, Olubajo O, Crittle T and Peters D, Designing enzyme-compatible ionic liquids that can dissolve carbohydrates. Green Chem 10:696–705 (2008).
  • 122
    Pham TPT, Cho C-W and Yun Y-S, Environmental fate and toxicity of ionic liquids: a review. Water Res 44:352–372 (2010).
  • 123
    Ranke J, Stolte S, Störmann R, Arning J and Jastorff B, Design of sustainable chemical products - the example of ionic liquids. Chem Rev 107:2183–2206 (2007).
  • 124
    Petkovic M, Seddon KR, Rebelo LPN and Pereira CS, Ionic liquids: a pathway to environmental acceptability. Chem Soc Rev 40:1383–1403 (2011).
  • 125
    Coleman D and Gathergood N, Biodegradation studies of ionic liquids. Chem Soc Rev 39:600–637 (2010).
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