Abstract
Water above its critical point (T c = 647 K, P c = 22.1 MPa), which is regarded as supercritical water (SCW), is being given increasing attention as a medium for organic chemistry. This interest in SCW is mainly driven by the search for more “green” or environmentally benign chemical processes. The use of SCW instead of organic solvents in chemical processes offers environmental advantages and may lead to pollution prevention. SCW has been applied in synthetic fuels production, biomass processing, waste treatment, materials synthesis, and geochemistry. However, higher critical parameters of water indicate that the operation process is performed at harsh conditions, thereby increasing cost. Other drawbacks of the use of water as the medium for biomass liquefaction reaction include lower biofuel yield and higher oxygen content. Organic solvents, such as methanol, ethanol, and 2-propanol, have been utilized as co-solvents of SCW to enhance the biofuel yield with lower oxygen content and higher heating value. This paper mainly expounds the basic characteristics of the co-solvent in sub/supercritical water and analyzes the function of the co-solvent in reactions to provide readers with a more comprehensive knowledge of the co-solvent. Based on literature and related studies conducted by our group, systematic analysis about selection and application of co-solvent was conducted.
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References
Andrew AP, Frédéric V, Russell PL, Morgan F, Michael Jr JA, Jefferson WT. Thermochemical biofuel production in hydrothermal media: a review of sub- and supercritical water technologies. Energy Environ Sci. 2008;1:32–65.
James WL. Advanced biofuels and bioproducts. New York: Springer; 2013. ISBN 978-1-4614-3348-4.
Li H, Yuan XZ, Zeng GM, Tong JY, Yan Y, Cao HT, Wang LH, Cheng MY, Zhang JC, Yang D. Liquefaction of rice straw in sub- and supercritical 1, 4-dioxane-water mixture. Fuel Process Technol. 2009;90:657–63.
Huang HJ, Yuan XZ, Zeng GM, Wang JY, Li H, Zhou CF, Pei XK, You Q, Chen L. Thermochemical liquefaction characteristics of microalgae in sub- and supercritical ethanol. Fuel Process Technol. 2011;92:147–53.
Karagoz S, Bhaskar T, Muto A, Sakata Y. Comparative studies of oil compositions produced from sawdust, rice husk, lignin and cellulose by hydrothermal treatment. Fuel. 2005;84:875–84.
Liu ZG, Zhang FS. Effects of various solvents on the liquefaction of biomass to produce fuels and chemical feedstocks. Energy Convers Manag. 2008;49:3498–504.
Ye Y, Fan J, Chang J. Effect of reaction conditions on hydrothermal degradation of cornstalk lignin. J Anal Appl Pyrolysis. 2012;94:190–5.
Chen Y, Wu YL, Zhang PL, Hua DR, Yang MD, Li C, Chen Z, Liu J. Direct liquefaction of Dunaliella tertiolecta for bio-oil in sub/supercritical ethanol-water. Bioresour Technol. 2012;124:190–8.
Cheng SN, D’cruz I, Wang MC, Leitch M, Xu CB. Highly efficient liquefaction of woody biomass in hot-compressed alcohol-water co-solvents. Energy Fuel. 2010;24:4659–67.
George WH, Sara I, Avelino C. Synthesis of transportation fuels from biomass: chemistry, catalysts and engineering. Chem Rev. 2006;106:4044–98.
Xu CB, Etcheverry T. Hydro-liquefaction of woody biomass in sub- and super-critical ethanol with iron-based catalysts. Fuel. 2008;87:335–45.
Yuan XZ, Li H, Zeng GM, Tong JY, Xie W. Sub-and supercritical liquefaction of rice straw in the presence of ethanol-water and 2-propanol-water mixture. Energy. 2007;32:2081–8.
Wang G, Li W, Chen H, Li B. The direct liquefaction of sawdust in tetralin. Energy Source Part A. 2007;29:1221–31.
Wang CW, Zhou FL, Yang Z, Wang WG, Yu FQ, Wu YX, Chi R. Hydrolysis of cellulose into reducing sugar via hot-compressed ethanol/water mixture. Biomass Bioenergy. 2012;42:143–50.
Brennecke JF, Eckert CA. Phase equilibria for supercritical fluid process design. AICHE J. 1989;35:1409–27.
Takumi O, Shunsuke K, Takaaki H, Yoshiyuki S, Hiroshi I. Volumetric behavior and solution microstructure of methanol-water mixture in sub- and supercritical state via density measurement and MD simulation. Fluid Phase Equilib. 2011;302:55–9.
Darja P, Valter D. Volumetric properties of ethanol-water mixtures under high temperatures and pressures. Fluid Phase Equilib. 2005;230:36–44.
Dixit S, Crain J, Poon WC, Finney JL, Soper AK. Molecular segregation observed in a concentrated alcohol-water solution. Nature. 2002;416:829–32.
Ikushima Y, Hatakeda K, Saito N, Arai M. An in situ Raman spectroscopy studies of subcritical and supercritical water the peculiarity of hydrogen bonding near the critical point. J Chem Phys. 1998;108:5855–60.
Lamanna S, Cannistraro R. Effect of ethanol addition upon the structure and the cooperativity of the water H bond network. Chem Phys. 1996;213:95–110.
Lee JH, Foster NR. Oxidation of methanol in supercritical water. J Ind Eng Chem. 1999;5:116–22.
Anitescu G, Zhang ZH, Tavlarides LL. A kinetic study of methanol oxidation in supercritical water. Ind Eng Chem Res. 1999;1999(38):2231–7.
Gao J. Supercritical hydration of organic compounds. The potential of mean force for benzene dimer in supercritical water. J Am Chem Soc. 1993;115:6893–5.
Van Konynenburg PH, Scott RL. Critical lines and phase equilibria in binary Van Der Waals mixtures. Phil Trans R Soc Lond A. 1980;298:495–540.
Weingartner H, Franck EU. Supercritical water as a solvent. Angew Chem Int Ed. 2005;44:2672–92.
Carlos ND, Josep BA, Oliver C, Philippe U, Jacqueline R. Dynamical and structural properties of benzene in supercritical water. J Chem Phys. 2004;121:10566–76.
Rasulov SM, Abdulagatov IM. PVTx measurements of water-n-pentane mixtures in critical and supercritical regions. J Chem Eng Data. 2010;55:3247–61.
Kiselev M, Puhovskia Y, Kerdcharoen T, Hannongbua S. The study of hydrophobic hydration in supercritical water-methanol mixtures. J Mol Graphics Model. 2001;19:412–6.
Antal MJ, Allen SG, Schulman D, Xu XD, Divilio RJ. Biomass gasification in supercritical water. Ind Eng Chem Res. 2009;39:4040–53.
Aida TM, Sato Y, Watanabe M, Tajima K, Nonaka T, Hattori H, Arai K. Dehydration of d-glucose in high temperature water at pressures up to 80 MPa. J Supercrit Fluids. 2007;40:381–8.
Watanabe M, Matsuo Y, Matsushita T, Inomata H, Miyake T, Hironaka K. Chemical recycling of polycarbonate in high pressure high temperature steam at 573 K. Polym Degrad Stab. 2009;94:2157–62.
Genta M, Iwaya T, Sasaki M, Goto M. Supercritical methanol for polyethylene terephthalate depolymerization: observation using simulator. Waste Manag. 2007;27:1167–77.
Takesue M, Suino A, Hakuta Y, Hayashi H, Smith RL. Formation mechanism and luminescence appearance of Mn-doped zinc silicate particles synthesized in supercritical water. J Solid State Chem. 2008;181:1307–13.
Saka S, Kusdiana D. Biodiesel fuel from rapeseed oil as prepared in supercritical methanol. Fuel. 2001;80:225–31.
Demirbas A. Mechanisms of liquefaction and pyrolysis reactions of biomass. Energy Convers Manag. 2000;41:633–46.
Ogi T, Minowa T, Dote Y, Yokoyama S. Characterization of oil produced by the direct liquefaction of Japanese oak in an aqueous 2-propanol solvent system. Biomass Bioenergy. 1994;7:193–9.
Ogi T, Yokoyama S. Liquid fuel production from woody biomass by direct liquefaction. Sekiyu Gakkaishi. 1993;36:73–84.
Demirbas A. Effect of lignin content on aqueous liquefaction products of biomass. Energy Convers Manag. 2000;41:1601–7.
Heitz M, Brown A, Chornet E. Solvent effects on liquefaction: solubilization profiles of a Canadian prototype wood, populus deltoids, in the presence of different solvents. Can J Chem Eng. 1994;72:1021–7.
Demirbas A. Conversion of wood to liquid products using alkaline glycerol. Fuel Sci Technol Int. 1992;10:173–84.
Yao YG. Soluble properties of liquefied biomass prepared in organic solvents. Mokuzai Gakkaishi. 1994;40:176–84.
Akiya N, Savage PE. Roles of water for chemical reactions in high-temperature water. Chem Rev. 2002;102:2725–50.
Li L, Kiran E. Interaction of supercritical fluids with lignocellulosic materials. Ind Eng Chem Res. 1988;27:1301–12.
Pasquini D, Pimenta MTB, Ferreira LH, Curvelo AAS. Extraction of lignin from sugar cane bagasse and Pinus taeda wood chips using ethanol–water mixtures and carbon dioxide at high pressures. J Supercrit Fluids. 2005;36:31–9.
Kabyemela BM, Adschiri T, Malalua R, Arai MK, Ohzeki H. Rapid and selective conversion of glucose to erythrose in supercritical water. Ind Eng Chem Res. 1997;36:5063–7.
Antal MJ, Leesomboon T, Mok WS, Richards GN. Mechanism of formation of 2-furaldehyde from D-xylose. Carbohydr Res. 1991;217:71–85.
Liu Y, Yuan XZ, Huang HJ, Wang XL, Wang H, Zeng GM. Thermochemical liquefaction of rice husk for bio-oil production in mixed solvent (ethanol-water). Fuel Process Technol. 2013;112:93–9.
Liu HM, Xie XA, Li MF, Sun RC. Hydrothermal liquefaction of cypress: effects of reaction conditions on 5-lump distribution and composition. J Anal Appl Pyrolysis. 2012;94:177–83.
Muppaneni T, Reddy HK, Patil PD, Dailey P, Aday C, Deng S. Ethanolysis of camelina oil under supercritical condition with hexane as a co-solvent. Appl Energy. 2012;94:84–8.
Yang RL, Chen Y, Wu YL, Hua DR, Yang MD, Li C, Chen Z, Liu J. Production of liquid fuel via co-liquefaction of coal and Dunaliella tertiolecta in sub/supercritical water-ethanol system. Energy Fuel. 2013;27:2619–27.
Ross DS, Green TK, Mansani R, Hum GP. Coal conversion in CO/water. 1. Conversion mechanism. Energy Fuel. 1987;1:287–91.
Guo ZX, Bai ZQ, Bai J, Wang ZQ, Li W. Co-liquefaction of lignite and sawdust under syngas. Fuel Process Technol. 2011;92:119–25.
Alonso MV, Oliet M, Perez JM, Rodriguez F, Echeverria J. Determination of curing kinetic parameters of lignin-phenol-formaldehyde resol resins by several dynamic differential scanning calorimetry methods. Thermochim Acta. 2004;419:161–7.
Cheng SN, Wilks C, Yuan ZS, Leitch M, Xu CB. Hydrothermal degradation of alkali lignin to bio-phenolic compounds in sub/supercritical ethanol and water–ethanol co-solvent. Polym Degrad Stab. 2012;97:839–48.
Chandler K, Deng F, Dillow AK, Liotta CL, Eckert CA. Alkylation reactions in near-critical water in the absence of acid catalysts. Ind Eng Chem Res. 1997;36:5175–9.
McCormick RL, Graboski MS, Alleman TL, Herring AM. Impact of biodiesel source material and chemical structure on emissions of criteria pollutants from a heavy-duty engine. Environ Sci Technol. 2001;35:1742–7.
Lotero E, Liu Y, Lopez DE, Suwannakarn K, Bruce DA, Goodwin Jr JG. Synthesis of biodiesel via acid catalysis. Ind Eng Chem Res. 2005;44:5353–63.
Iso M, Chen B, Eguchi M, Kudo T, Shrestha S. Production of biodiesel fuel from triglycerides and alcohol using immobilized lipase. J Mol Catal B: Enzym. 2001;16:53–8.
Madras G, Kolluru C, Kumar R. Synthesis of biodiesel in supercritical fluids. Fuel. 2004;83:2029–33.
Kusdiana D, Saka S. Effects of water on biodiesel fuel production by supercritical methanol treatment. Bioresour Technol. 2004;91:289–95.
van Kasteren JMN, Nisworo AP. A process model to estimate the cost of industrial scale biodiesel production from waste cooking oil by supercritical transesterification. Resour Conserv Recycl. 2007;50:442–58.
Silva C, Weschenfelder TA, Rovani S, Corazza FC, Corazza ML, Dariva C, Vladimir OJ. Continuous production of fatty acid ethyl esters from soybean oil in compressed ethanol. Ind Eng Chem Res. 2007;46:5304–9.
Ignacio V, da Camila S, Isabella A, Gustavo RB, Fernanda CC, Vladimir OJ, Maria AG, Iván J. Continuous catalyst-free methanolysis and ethanolysis of soybean oil under supercritical alcohol/water mixtures. Renew Energy. 2010;35:1976–81.
Kusdiana D, Saka S. Methyl esterification of free fatty acids of rapeseed oil as treated in supercritical methanol. J Chem Eng Jpn. 2001;34:383–7.
Zhang T, Zhou YJ, Liu DH, Petrus L. Qualitative analysis of products formed during the acid catalyzed liquefaction of bagasse in ethylene glycol. Bioresour Technol. 2007;98:1454–9.
Zhi YP, Zhen B, Ying XC. Depolymerization of poly (bisphenol A carbonate) in subcritical and supercritical toluene. Chin Chem Lett. 2006;17:545–8.
Vijaykumar S, Mayank RP, Jigar VP. Pet waste management by chemical recycling: a review. J Polym Environ. 2010;18:8–25.
Mohammad NS, Dimitris S, Halim HR, Dimitris NB, Konstantios AGK, George PK. Hydrolytic depolymerization of PET in a microwave reactor. Macromol Mater Eng. 2010;295:575–84.
Liu FS, Li Z, Yu ST, Cui X, Xie CX, Ge XP. Methanolysis and hydrolysis of polycarbonate under moderate conditions. J Polym Environ. 2009;17:208–11.
Chen L, Wu Y, Ni Y, Huang K, Zhu Z. Depolymerization of polycarbonate in critical region of methanol. Acta Sci Cir. 2004;24:604.
Raul P, Juan G, Maria JC. Chemical recycling of polycarbonate in a semi-continuous lab-plant. A green route with methanol and methanol-water mixtures. Green Chem. 2005;7:380–7.
Nayeleh D, Abdul RR. Hydrolysis degradation of polycarbonate using different co–solvent under microwave irradiation. APCBEE Procedia. 2012;3:172–6.
Motofumi S, Takafumi S, Masaru W, Tadafumi A, Kunio A. Conversion of lignin with supercritical water-phenol mixtures. Energy Fuel. 2003;17:922–8.
Wayman M, Lora JH. Aspen autohydrolysis: the effects of 2-naphthol and other aromatic compounds. Tappi Tech Assoc Pulp Pap Ind. 1978;61:55–7.
Lin L, Yao Y, Yoshioka M, Shiraishi N. Liquefaction mechanism of lignin in the presence of phenol at elevated temperature without catalysts. Studies on β-O-4 lignin model compound. I. Structural characterization of the reaction products. Holzforschung. 1997;51:316–24.
Saisu M, Sato T, Adschiri MWT, Arai K. Conversion of lignin with supercritical water-phenol mixtures. Energy Fuel. 2003;17:922–8.
Okuda K, Umetsu M, Takami S, Adschiri T. Disassembly of lignin and chemical recovery-rapid depolymerization of lignin without char formation in water-phenol mixtures. Fuel Process Technol. 2004;85:803–13.
Okuda K, Man X, Umetsu M, Takami S, Adschiri T. Efficient conversion of lignin into single chemical species by solvothermal reaction in water-p-cresol solvent. J Phys Condens Matter. 2004;16:S1325.
Takami S, Okuda K, Man X, Umetsu M, Ohara S, Adschiri T. Kinetic study on the selective production of 2-(Hydroxybenzyl)-4-methylphenol from organosolv lignin in a mixture of supercritical water and p-cresol. Ind Eng Chem Res. 2012;51:4804–8.
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Wu, Y., Chen, Y., Wu, K. (2014). Role of Co-solvents in Biomass Conversion Reactions Using Sub/Supercritical Water. In: Fang, Z., Xu, C. (eds) Near-critical and Supercritical Water and Their Applications for Biorefineries. Biofuels and Biorefineries, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-8923-3_3
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