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Preparation of heat-treated PAN hollow fiber membranes for pervaporation of NMP/H2O mixtures

机译：用于NMP / H2O混合物渗透汽化的PAN中空纤维热处理膜的制备

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In this study, the dehydration of NMP aqueous solution is achieved through NMP-insoluble PAN hollow fiber membranes by heat-treatment the NMP-soluble PAN hollow fiber membranes for 12 h at temperatures higher than 180 °C The pervaporation results of a 30 wt% aqueous NMP solution at 25 °C through PAN hollow fiber membranes showed that the permeation flux was higher when the temperature in the range of 180-300 °C at which the heat treatment occurred was higher, and it was almost constant when the temperature at which the heat treatment occurred was higher than 300 °C. As for the water content of permeate, it was all 100 wt% water concentration in permeate for the PAN hollow fiber membranes heat-treated in the temperature range from 180 to 360 °C. Furthermore, the permeation rate decreased with increasing NMP concentration in the feed solution and increased with increasing feed solution temperature. The activation energy of the aqueous NMP solution permeating through the PAN hollow fiber membrane heat-treated at 300 °C was 3.65 kcal/mol for a 30 wt% NMP concentration in feed mixtures.
机译：在这项研究中，NMP水溶液通过NMP不溶性PAN中空纤维膜的脱水来实现，方法是在高于180°C的温度下对NMP可溶性PAN中空纤维膜进行热处理12 h。全蒸发结果为30 wt％通过PAN中空纤维膜在25°C的NMP水溶液中发现，当热处理发生的温度在180-300°C时，渗透通量更高，而当温度在180-300°C时，渗透通量几乎恒定。发生的热处理温度高于300°C。至于渗透物的水含量，对于在180至360℃的温度范围内进行热处理的PAN中空纤维膜而言，渗透物中的水浓度全部为100重量％。此外，渗透速率随着进料溶液中NMP浓度的增加而降低，并且随着进料溶液温度的升高而增加。在进料混合物中NMP浓度为30 wt％时，透过在300°C热处理的PAN中空纤维膜渗透的NMP水溶液的活化能为3.65 kcal / mol。

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