SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (4): 852-863.DOI: 10.1016/j.cjche.2017.08.018

• Energy, Resources and Environmental Technology • 上一篇    下一篇

Transesterification of sunflower oil in microchannels with circular obstructions

Harrson S. Santana1, João L. Silva Jr2, Deborah S. Tortola1, Osvaldir P. Taranto1   

  1. 1 School of Chemical Engineering, University of Campinas, 13083-852 Campinas, SP, Brazil;
    2 Federal Institute of Education, Science and Technology of South of Minas Gerais-IFSULDEMINAS, 37560-260 Pouso Alegre, MG, Brazil
  • 收稿日期:2017-05-10 修回日期:2017-05-10 出版日期:2018-04-28 发布日期:2018-05-19
  • 通讯作者: Harrson S. Santana,E-mail addresses:harrison.santana@gmail.com,harrison@feq.unicamp.br

Transesterification of sunflower oil in microchannels with circular obstructions

Harrson S. Santana1, João L. Silva Jr2, Deborah S. Tortola1, Osvaldir P. Taranto1   

  1. 1 School of Chemical Engineering, University of Campinas, 13083-852 Campinas, SP, Brazil;
    2 Federal Institute of Education, Science and Technology of South of Minas Gerais-IFSULDEMINAS, 37560-260 Pouso Alegre, MG, Brazil
  • Received:2017-05-10 Revised:2017-05-10 Online:2018-04-28 Published:2018-05-19
  • Contact: Harrson S. Santana,E-mail addresses:harrison.santana@gmail.com,harrison@feq.unicamp.br

摘要: The present paper studied numerical and experimentally the transesterification reaction between sunflower oil and ethanol with NaOH catalyst in microchannels with circular obstructions. The micromixer design influence on fluid mixing and oil conversion was investigated for a range of operating conditions:Reynolds number (Re=0.1-100), Temperature (25-75℃), ethanol/oil molar ratio (6-12), and catalyst concentration (0.75 wt%-1.25 wt%), using three microchannel configurations (Length=35 mm; Width=1500 μm; Height=200 μm):T-shape-channel without obstructions; MCO-channel with 3 obstructions ensemble-equally disposed over longitudinal length; MWO-channel with 7 obstructions ensemble. The MCO micromixer was based on literature work, and the MWO is a totally new micromixer design. Experimental tests were conducted in similar conditions in microreactors using these micromixers (Length=411 mm) made of polydimethylsiloxane. The MCO configuration presented the highest performance (mixing index of 0.80 at Re=100), oil conversion of 81.13% at 75℃, molar ratio of 9 and catalyst concentration of 1%. Experimental results showed high conversions for MCO and MWO configurations (99.99%) at 50℃, molar ratio of 9 and catalyst concentration of 1%, with a residence time of 12 s.

关键词: Biodiesel, Sunflower oil-ethanol, Transesterification reaction, Circular obstructions, Microreactor, Numerical simulation

Abstract: The present paper studied numerical and experimentally the transesterification reaction between sunflower oil and ethanol with NaOH catalyst in microchannels with circular obstructions. The micromixer design influence on fluid mixing and oil conversion was investigated for a range of operating conditions:Reynolds number (Re=0.1-100), Temperature (25-75℃), ethanol/oil molar ratio (6-12), and catalyst concentration (0.75 wt%-1.25 wt%), using three microchannel configurations (Length=35 mm; Width=1500 μm; Height=200 μm):T-shape-channel without obstructions; MCO-channel with 3 obstructions ensemble-equally disposed over longitudinal length; MWO-channel with 7 obstructions ensemble. The MCO micromixer was based on literature work, and the MWO is a totally new micromixer design. Experimental tests were conducted in similar conditions in microreactors using these micromixers (Length=411 mm) made of polydimethylsiloxane. The MCO configuration presented the highest performance (mixing index of 0.80 at Re=100), oil conversion of 81.13% at 75℃, molar ratio of 9 and catalyst concentration of 1%. Experimental results showed high conversions for MCO and MWO configurations (99.99%) at 50℃, molar ratio of 9 and catalyst concentration of 1%, with a residence time of 12 s.

Key words: Biodiesel, Sunflower oil-ethanol, Transesterification reaction, Circular obstructions, Microreactor, Numerical simulation