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Efficiency of Freeze Concentration with Ultrasonic Irradiation under Constant Freezing Rate : Effect of Solute

Authors
Publisher
愛媛大学工学部
Publication Date
Keywords
  • Freeze Concentration
  • Ultrasonic Irradiation
  • Solute
  • Molecular Weight
  • Diffusion Coefficient
  • 500

Abstract

?????????????????????????????????????????????????????????????????????????????????????????? ?????????????????????????? ??????????????????????????????????????????????????? ????? ????????????????????????????????????????????????????????????????????????????????????????????????????????????? ???????????????????????????????????????? ????????????????????????????????????????????????????????????????????????????????????? ???????????????????? ??? ????????????????????????????????????????????????????????? ?????? ???? 71 工学ジャーナル 第 7 巻 2008 年 3 月 Annual Journal of Eng., Ehime Univ., VII, Mar., 2008 平成 19 年 8 月 31 日 受付 , 平成 19 年 12 月 10 日 受理 ? ? ? ? ? ? ? ? ? ? ? ? ? * Originally published in Journal of Chemical Engineering of Japan, 1999, Vol.32, No.5, pp.569-572 and Chemical Engineering Research and Design, 2006, Vol.84, No.A2, pp.107?112 ** Department of Applied Chemistry, Ehime University, Matsuyama, Japan 790-8577 E-mail : [email protected] Efficiency of Freeze Concentration with Ultrasonic Irradiation under Constant Freezing Rate -Effect of Solute- Kenji KAWASAKI and Akira MATSUDA Abstract: The performance of freeze concentration at constant freezing rate (40 mm/h) with/without ultrasonic irradiation was examined using three one-component solutions containing only one solute (mass concentration: 0.5, 5.0 kg/m3 and ionic or molecular concentration: 0.03 mol/L) and a three-component solution containing three solutes (each component concentration: 0.01 mol/L). Without ultrasonic irradiation the solutes are hardly concentrated at this freezing rate. On the other hand, with ultrasonic irradiation, the concentration efficiency is very good. In the equal mass concentration condition, the solutes of larger molecular weight are concentrated more effectively than solutes of smaller molecular weight. On the contrary, the solutes of smaller molecular weight are concentrated more effectively than solutes of larger molecular weight and the

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