Liquid-liquid membrane dispersion in a stirred cell with and without controlled shear
Liquid-liquid membrane dispersion in a stirred cell with and without controlled shear
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DOI：
10.1021/ie0504699
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发表时间：
2005-11-23
影响因子：
4.2
通讯作者：
Stillwell, MT
中科院分区：
文献类型：
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作者：
Kosvintsev, SR;Gasparini, G;Stillwell, MT
油通过膜进入含有表面活性剂(吐温20)的连续水相，形成油滴直径在40到400微米之间的油分散体。使用了两种类型的搅拌设备：在所有径向位置提供恒定剪切应力的魏森伯格流变仪(锥形和板状)，它被改进为包括膜而不是板和简单的搅拌槽，桨在膜上方旋转，提供径向位置的可变剪切。实验表明，简单的桨叶搅拌槽提供的油滴分散度与受控剪切装置产生的油滴分散度一样大，甚至更好。分析表明，只有桨叶搅拌膜下靠近最大剪切半径的膜段才会产生油滴。实验中所用的膜含有规则排列的均匀分布的非弯曲孔道，并提供高达1000 L m(-2)h(-1)的注油速率，远远高于报道的烧结制备的替代弯曲孔道膜的通量。
Oil was passed through membranes into a continuous water phase containing a surfactant (Tween 20) to form oil dispersions with drop diameters between 40 and 400 mu m. Two types of stirred equipment were used: a Weissenberg rheometer (cone and plate geometry) providing constant shear stress at all radial positions which was modified to include a membrane instead of the plate and a simple stirred cell, with a paddle rotating above the membrane, providing variable shear with radial position. Experiments show that the simple paddle-stirred cell provided an oil drop dispersion that was as monosized as that produced by the controlled shear device, if not better. An analysis indicated that only the section of the membrane close to the radius of the highest shear under the paddle stirred membrane produced oil drops. The membranes used in the experiments contained a regular array of nontortuous pores uniformly spaced and provided oil injection rates up to 1000 L m(-2) h(-1), which is much higher than reported fluxes for the alternative tortuous pore channel membranes made by sintering.