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Biofuels pp 103-135 | Cite as

Ultrasound-Assisted Biodiesel Synthesis: A Mechanistic Insight

  • Ritesh S. Malani
  • Arun Goyal
  • Vijayanand S. MoholkarEmail author
Chapter
Part of the Green Energy and Technology book series (GREEN)

Abstract

Use of ultrasound in intensification of biodiesel synthesis process is well-known. However, most of the published literature in this area has focused on results than rationale—in that the exact physical mechanism of the ultrasound-induced enhancement of the biodiesel synthesis has remained unexplored. The research in our group has tried to fulfil this crucial knowledge gap. In this chapter, we have provided an overview and analysis of our studies in establishment of the physical mechanism of ultrasound-assisted biodiesel synthesis. This essentially means identification of the links between physical and chemical effects of ultrasound and cavitation, and the basic chemistry of biodiesel synthesis. The physical effect of cavitation and ultrasound is generation of intense microturbulence in the medium, while the chemical effect is generation of highly reactive radicals through thermal dissociation of the gas and vapor molecules entrapped in the bubble. The basic approach in our research has been concurrent analysis of the experimental results and simulations of cavitation bubble dynamics. We have treated diverse biodiesel synthesis processes that employ edible, non-edible and mixed non-edible feedstocks of oil, both base and acid catalysts in homogeneous form and heterogeneous base catalysts. Our analysis has essentially established that physical effects of ultrasound and cavitation have greater contribution to enhancement and intensification of the transesterification process for biodiesel synthesis. This is essentially manifested through generation of strong emulsion and elimination of mass transfer barriers in the process. However, for heterogeneous catalyzed systems, the mass transfer still remains the rate controlling step, despite intense microconvection generated by sonication.

Keywords

Ultrasound Non-edible oil Esterification Transesterification Catalyst Modelling 

References

  1. 1.
    Moholkar VS, Choudhury HA, Singh S, Khanna S, Ranjan A, Chakma, S Bhasarkar JB (2015) Physical and chemical mechanisms of ultrasound in biofuel synthesis. In: Fang Z, Smith RL, Qi X (eds) Production of biofuels and chemical with ultrasound, biofuels and biorefineries series, vol. 4. Springer Science + Business Media, Dordrecht, pp 35–86Google Scholar
  2. 2.
    Borah AJ, Singh S, Goyal A, Moholkar VS (2016) An assessment of the potential of invasive weeds as multiple feedstocks for biofuel production. RSC Adv 6(52):47151–47163CrossRefGoogle Scholar
  3. 3.
    Ranjan A, Singh S, Malani RS, Moholkar VS (2016) Ultrasound-assisted bioalcohol synthesis: review and analysis. RSC Adv 6(70):65541–65562CrossRefGoogle Scholar
  4. 4.
    Gerpen JV (2005) Biodiesel processing and production. Fuel Process Technol 86:1097–1107CrossRefGoogle Scholar
  5. 5.
    Ma F, Hanna MA (1999) Biodiesel production: a review. Bioresour Technol 70(1):1–5CrossRefGoogle Scholar
  6. 6.
    Kumar M, Sharma MP (2015) Assessment of potential of oils for biodiesel production. Renew Sustain Energy Rev 44:814–823CrossRefGoogle Scholar
  7. 7.
    Suslick KS (1988) Ultrasound: its physical, chemical and biological effects. VCH, New YorkGoogle Scholar
  8. 8.
    Hart EJ, Henglein A (1985) Free radical and free atom reactions in the sonolysis of aqueous iodide and formate solutions. J Phys Chem 89(20):4342–4347CrossRefGoogle Scholar
  9. 9.
    Hart EJ, Henglein A (1987) Sonochemistry of aqueous solutions: hydrogen–oxygen combustion in cavitation bubbles. J Phys Chem 91:3654–3656CrossRefGoogle Scholar
  10. 10.
    Leighton TG (1994) The acoustic bubble. Academic Press, San DiegoGoogle Scholar
  11. 11.
    Mason TJ, Lorimer JP (2002) Applied sonochemistry: the uses of power ultrasound in chemistry and processing. Wiley–VCH, CoventryGoogle Scholar
  12. 12.
    Shah YT, Pandit AB, Moholkar VS (1999) Cavitation reaction engineering. Plenum Press, New YorkCrossRefGoogle Scholar
  13. 13.
    Atchley AA, Prosperetti A (1989) The crevice model of bubble nucleation. J Acoust Soc Am 86:1065–1084CrossRefGoogle Scholar
  14. 14.
    Young FR (1989) Cavitation. McGraw Hill, LondonGoogle Scholar
  15. 15.
    Flynn HG (1964) Physics of acoustic cavitation in liquids. In: Mason WP (ed) Physical Acoustics. Academic Press, New York, pp 57–172Google Scholar
  16. 16.
    Rayleigh L (1917) On the pressure developed in a liquid during the collapse of spherical cavity. Phil Mag 34:94–98CrossRefzbMATHGoogle Scholar
  17. 17.
    Plesset MS (1949) Dynamics of cavitation bubbles. J Appl Mech (Trans. ASME) 16:277–282Google Scholar
  18. 18.
    Noltingk BE, Neppiras EA (1950) Cavitation produced by ultrasonics. Proc Phys Soc B63:674–685CrossRefGoogle Scholar
  19. 19.
    Poritsky H (1952) The collapse or growth of a spherical bubble or cavity in a viscous fluid. In: Sternberg E (ed) Proceedings 1st national congress on theoretical and applied mechanics, pp 813–821Google Scholar
  20. 20.
    Gilmore FR (1954) Hydrodynamic Laboratory Report. California Institute of Technology, 26–4Google Scholar
  21. 21.
    Kirkwood JG, Bethe HA (1942) The pressure wave produced by an under water explosion. Office of Science Research and Development, Rep 558Google Scholar
  22. 22.
    Keller JB, Kolodner II (1956) Damping of underwater explosion bubble oscillations. J Appl Phys 27:1152–1161CrossRefGoogle Scholar
  23. 23.
    Keller JB, Miksis MJ (1980) Bubble oscillations of large amplitude. J Acoust Soc Am 68:628–633CrossRefzbMATHGoogle Scholar
  24. 24.
    Prosperetti A, Lezzi A (1986) Bubble dynamics in a compressible liquid. Part 1. First order theory. J Fluid Mech 168:457–477CrossRefzbMATHGoogle Scholar
  25. 25.
    Colussi AJ, Weavers LK, Hoffmann MR (1998) Chemical bubble dynamics and quantitative sonochemistry. J Phys Chem A 102(35):6927–6934CrossRefGoogle Scholar
  26. 26.
    Lofstedt R, Weninger K, Puttermann SJ, Barber BP (1995) Sonoluminescing bubbles and mass diffusion. Phys Rev E 51:4400–4410CrossRefGoogle Scholar
  27. 27.
    Barber BP, Hiller RA, Lofstedt R, Putterman SJ, Weninger KR (1997) Defining the un-knowns of sonoluminescence. Phys Rep 281:65–143CrossRefGoogle Scholar
  28. 28.
    Krishnan SJ, Dwivedi P, Moholkar VS (2006) Numerical investigation into the chemistry induced by hydrodynamic cavitation. Ind Eng Chem Res 45:1493–1504CrossRefGoogle Scholar
  29. 29.
    Storey BD, Szeri AJ (2000) Water vapor, sonoluminescence and sonochemistry. Proc R Soc Lond Ser A 456:1685–1709CrossRefGoogle Scholar
  30. 30.
    Storey BD, Szeri AJ (2001) A reduced model of cavitation physics for use in sonochemistry. Proc R Soc Lond Ser A 457:1685–1700CrossRefGoogle Scholar
  31. 31.
    Eames IW, Marr NJ, Sabir H (1997) The evaporation coefficient of water: a review. Int J Heat Mass Transfer 40:2963–2973CrossRefzbMATHGoogle Scholar
  32. 32.
    Toegel R, Gompf B, Pecha R, Lohse D (2000) Does water vapor prevent upscaling sono-luminescence? Phys Rev Lett 85:3165–3168CrossRefGoogle Scholar
  33. 33.
    Toegel R (2002) Reaction diffusion kinetics of a single sonoluminescing bubble. Ph.D. Dissertation, University of Twente, NetherlandsGoogle Scholar
  34. 34.
    Hirschfelder JO, Curtiss CF, Bird RB (1954) Molecular theory of gases and liquids. Wiley, New YorkzbMATHGoogle Scholar
  35. 35.
    Reid RC, Prausnitz JM, Poling BE (1987) Properties of gases and liquids. McGraw Hill, New YorkGoogle Scholar
  36. 36.
    Condon EU, Odishaw H (1958) Handbook of physics. McGraw Hill, New YorkGoogle Scholar
  37. 37.
    Crank J (1975) The mathematics of diffusion. Clarendon Press, OxfordzbMATHGoogle Scholar
  38. 38.
    Brennen CE (1995) Cavitation and bubble dynamics. Oxford University Press, OxfordzbMATHGoogle Scholar
  39. 39.
    Kolb J, Nyborg WL (1956) Small scale acoustic streaming in liquids. J Acoust Soc Am 28:1237–1242CrossRefGoogle Scholar
  40. 40.
    Nyborg WL (1958) Acoustic streaming near a boundary. J Acoust Soc Am 30:329–339MathSciNetCrossRefGoogle Scholar
  41. 41.
    Davis SL Vibrational modes of methanol. http://classweb.gmu.edu/sdavis/research/modes.htm. Accessed May 2000
  42. 42.
    Kalva A, Sivasankar T, Moholkar VS (2009) Physical mechanism of ultrasound–assisted synthesis of biodiesel. Ind Eng Chem Res 48:534–544CrossRefGoogle Scholar
  43. 43.
    Parkar PA, Choudhary HA, Moholkar VS (2012) Mechanistic and kinetic investigations in ultrasound assisted acid catalyzed biodiesel synthesis. Chem Eng J 187:248–260CrossRefGoogle Scholar
  44. 44.
    Choudhury HA, Chakma S, Moholkar VS (2014) Mechanistic insight into sonochemical biodiesel synthesis using heterogeneous base catalyst. Ultrason Sonochem 21:169–181CrossRefGoogle Scholar
  45. 45.
    Choudhury HA, Malani RS, Moholkar VS (2013) Acid catalyzed biodiesel synthesis from Jatropha oil: mechanistic aspects of ultrasonic intensification. Chem Eng J 231:262–272CrossRefGoogle Scholar
  46. 46.
    Deng X, Fang Z, Liu YH, Yu CL (2011) Production of biodiesel from Jatropha oil catalyzed by nanosized solid basic catalyst. Energy 36(2):777–784CrossRefGoogle Scholar
  47. 47.
    Colussi AJ, Hoffmann MR (1999) Vapor supersaturation in collapsing bubbles: relevance to mechanisms of sonochemistry and sonoluminescence. J Phys Chem A 103:11336–11339CrossRefGoogle Scholar
  48. 48.
    Choudhury HA, Goswami PP, Malani RS, Moholkar VS (2014) Ultrasonic biodiesel synthesis from crude Jatropha curcas oil with heterogeneous base catalyst: mechanistic insight and statistical optimization. Ultrason Sonochem 21:1050–1064CrossRefGoogle Scholar
  49. 49.
    Choudhury HA, Srivastava P, Moholkar VS (2014) Single-step ultrasonic synthesis of biodiesel from crude Jatropha curcas oil. AIChE J 60:1572–1581CrossRefGoogle Scholar
  50. 50.
    Malani RS, Patil S, Kuldeep, Chakma S, Goyal A, Moholkar VS (2016) Mechanistic analysis of ultrasound–assisted biodiesel synthesis with Cu2O catalyst and mixed oil feedstock using continuous (packed bed) and batch (slurry) reactors (communicated)Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2017

Authors and Affiliations

  • Ritesh S. Malani
    • 1
  • Arun Goyal
    • 2
  • Vijayanand S. Moholkar
    • 1
    • 3
    Email author
  1. 1.Centre for EnergyIndian Institute of Technology, GuwahatiGuwahatiIndia
  2. 2.Department of Biosciences and BioengineeringIndian Institute of Technology, GuwahatiGuwahatiIndia
  3. 3.Department of Chemical EngineeringIndian Institute of Technology, GuwahatiGuwahatiIndia

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