Department of Applied Chemistry, Bu-Ali Sina University, 65174 Hamedan, Iran.
Department of Applied Chemistry, Bu-Ali Sina University, 65174 Hamedan, Iran.
Ultrason Sonochem. 2018 Mar;41:514-520. doi: 10.1016/j.ultsonch.2017.10.016. Epub 2017 Oct 19.
The influence of ultrasonic waves on liquid-liquid extraction of circulating drops and in the presence of magnetite nanoparticles was investigated. Experiments were conducted in a column equipped with an ultrasound transducer. The frequency and intensity of received waves, measured by the hydrophone standard method, were 35.40 kHz and 0.37 mW/cm, respectively. The recommended chemical system of cumene-isobutyric acid-water was used in which mass transfer resistance lies in the aqueous phase. Nanoparticles, within concentration range of (0.0003-0.0030) wt%, were added to the aqueous continuous phase. The presence of nanoparticles and ultrasonic waves provided no sensible change in drop size (within 2.49-4.17 mm) and measured terminal velocities were close to Grace model. However, presence of nanoparticles, caused mass transfer to decrease. This undesired effect was significantly diminished by using ultrasonic waves so that mass transfer coefficient increased from (73.0-178.2) to (130.2-240.2) µm/s, providing a 55.6% average enhancement. It is presumably due to disturbing the accumulated nanoparticles around the drops. The current innovative study highlights the fact that using ultrasonic waves is an interesting way to improve liquid-liquid extraction in the presence and absence of nanoparticles.
研究了超声波对循环液滴的液-液萃取以及在磁铁矿纳米粒子存在下的影响。实验在配备超声波换能器的柱中进行。通过水听器标准方法测量，接收到的波的频率和强度分别为 35.40 kHz 和 0.37 mW/cm。使用了推荐的异丙苯-异丁酸-水的化学体系，其中传质阻力位于水相。纳米粒子在（0.0003-0.0030）wt%的浓度范围内被添加到水连续相中。纳米粒子和超声波的存在没有明显改变液滴尺寸（在 2.49-4.17 mm 范围内），测量的终端速度接近 Grace 模型。然而，纳米粒子的存在导致传质减少。通过使用超声波，这种不期望的效果显著减弱，传质系数从（73.0-178.2）增加到（130.2-240.2）µm/s，平均增强了 55.6%。这可能是由于扰乱了液滴周围积累的纳米粒子。当前的创新研究强调了这样一个事实，即使用超声波是在存在和不存在纳米粒子的情况下改善液-液萃取的一种有趣方法。
