A liquid–vapor/gas separation microchannel device (channel length: 282.5 mm, channel width: 1 mm, gas channel depth: 1 mm, liquid channel depth: 100/300 μm) was developed and used as microstripper to remove acetone from water using dry nitrogen as carrier gas. The interface between the liquid and vapor/gas phases was stabilized by means of a flat sheet microporous hydrophobic/oleophobic acrylcopolymer membrane on polyester support. The separation efficiency of the microstripper was investigated with respect to two liquid channel depths (100 and 300 μm) for countercurrent flow arrangement by varying alternatively the liquid flow rate and the carrier gas flow rate. All experiments were carried out at room temperature (23 °C) and at atmospheric pressure. For all investigated process parameters in this work, fully developed laminar flow has been established in both fluid channels. Almost 100% acetone removal from the feed aqueous solution (5 wt% acetone) could be achieved in the microstripper with the liquid channel depth of 100 μm for a liquid flow rate of 0.025 ml/min (liquid residence time: 68 s) and for a carrier gas flow rate of 163 ml/min (gas residence time: 0.1 s). Furthermore, it was found that the overall volumetric mass transfer capacity coefficient K_La of the microstripper was strongly dependent on the liquid channel depth, while hardly affected by the liquid and carrier gas flow rates. The average value of K_La for a liquid channel depth of 100 μm was found about 0.091 s⁻¹. It is approximately five times greater than that for a liquid channel depth of 300 μm. This results indicates clearly the potential of device miniaturization to enhancing the separation efficiency of the microstripper.

研制出了一种气液分离的微通道装置（通道长度：282.5 mm，通道宽度：1 mm，气体通道深度：1 mm，液体通道深度：100/300μm），并用作微汽提塔，用于去除水中的丙酮干燥氮气作为载气。借助于聚酯载体上的平板状微孔疏水/疏油丙烯酸共聚物膜，稳定了液相和气相/气相之间的界面。通过交替改变液体流速和载气流速，研究了相对于两个液体通道深度（100和300μm）用于逆流流动的微提器的分离效率。所有实验均在室温（23°C）和大气压下进行。对于这项工作中所有调查过的过程参数，在两个流体通道中都建立了充分发展的层流。在微型剥离器中，液体通道深度为100μm，液体流速为0.025 ml / min（液体停留时间：68 s），并且在90 s内，可以从进料水溶液（5 wt％丙酮）中去除几乎100％的丙酮。载气流速为163 ml / min（气体停留时间：0.1 s）。此外，发现总体积传质能力系数微型剥离器的K _L a很大程度上取决于液体通道的深度，而几乎不受液体和载气流速的影响。发现对于100μm的液体通道深度，K _L a的平均值约为0.091 s ^-1。它大约是300μm液体通道深度的五倍。该结果清楚地表明了装置小型化对提高微剥离器的分离效率的潜力。