Vacuum membrane distillation by microchip with temperature gradient.
Vacuum membrane distillation by microchip with temperature gradient.
复制标题
温度梯度微芯片真空膜蒸馏。
DOI：
10.1039/b915534a
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发表时间：
2010
期刊：
影响因子：
6.1
通讯作者：
T. Anazawa
中科院分区：
文献类型：
--
作者：
Yaopeng Zhang;S. Kato;T. Anazawa
多层微芯片（25 × 95毫米）用于真空蒸馏设计，制造和测试的水-甲醇混合物的精馏。聚合物芯片采用冷却通道沿下面的蒸馏通道产生温度梯度，该蒸馏通道通过嵌入的微孔聚四氟乙烯（PTFE）膜分离为液相通道（72微米深）和气相通道（72微米深）。通过调节热板温度和冷却水流量来控制温度梯度，使汽提段温度高于富水液体的上升沸点，精馏段温度低于富甲醇蒸汽的下降露点。考察了温度梯度、进料组成、进料流量和膜孔径对微精馏的影响。在最佳条件下，理论板数可达1.8。
A multilayered microchip (25 x 95 mm) used for vacuum distillation is designed, fabricated and tested by rectification of a water-methanol mixture. The polymer chip employs a cooling channel to generate a temperature gradient along a distillation channel below, which is separated into a channel (72 microm deep) for liquid phase and a channel (72 microm deep) for vapor phase by an incorporated microporous poly(tetrafluoroethylene) (PTFE) membrane. The temperature gradient is controlled by adjusting hotplate temperature and flow rate of cooling water to make the temperatures in the stripping section higher than the increasing boiling points of the water-enriched liquids and the temperatures in the rectifying section lower than the decreasing dew points of the methanol-enriched vapors. The effects of temperature gradient, feed composition, feed flow rate and membrane pore size on the micro distillation are also investigated. A theoretical plate number up to 1.8 is achieved at the optimum conditions.