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首页> 美国卫生研究院文献>Membranes >Concentration of 13-dimethyl-2-imidazolidinone in Aqueous Solutions by Sweeping Gas Membrane Distillation: From Bench to Industrial Scale
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Concentration of 13-dimethyl-2-imidazolidinone in Aqueous Solutions by Sweeping Gas Membrane Distillation: From Bench to Industrial Scale

机译：扫气膜蒸馏在水溶液中的13-二甲基-2-咪唑啉酮浓度：从试验台到工业规模

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摘要

Sweeping gas membrane distillation (SGMD) is a useful option for dehydration of aqueous solvent solutions. This study investigated the technical viability and competitiveness of the use of SGMD to concentrate aqueous solutions of 1,3-dimethyl-2-imidazolidinone (DMI), a dipolar aprotic solvent. The concentration from 30% to 50% of aqueous DMI solutions was attained in a bench installation with Liqui-Cel SuperPhobic hollow-fiber membranes. The selected membranes resulted in low vapor flux (below 0.15 kg/h·m ) but were also effective for minimization of DMI losses through the membranes, since these losses were maintained below 1% of the evaporated water flux. This fact implied that more than 99.2% of the DMI fed to the system was recovered in the produced concentrated solution. The influence of temperature and flowrate of the feed and sweep gas streams was analyzed to develop simple empirical models that represented the vapor permeation and DMI losses through the hollow-fiber membranes. The proposed models were successfully applied to the scaling-up of the process with a preliminary multi-objective optimization of the process based on the simultaneous minimization of the total membrane area, the heat requirement and the air consumption. Maximal feed temperature and air flowrate (and the corresponding high operation costs) were optimal conditions, but the excessive membrane area required implied an uncompetitive alternative for direct industrial application.
机译：吹扫气膜蒸馏（SGMD）是溶剂水溶液脱水的有用选择。这项研究调查了使用SGMD浓缩偶极非质子溶剂1,3-二甲基-2-咪唑啉酮（DMI）水溶液的技术可行性和竞争力。在带有Liqui-Cel SuperPhobic中空纤维膜的台式设备中，DMI水溶液的浓度为30％至50％。所选的膜导致低的蒸汽通量（低于0.15 kg / h·m），但对于最小化通过膜的DMI损失也很有效，因为这些损失保持在蒸发水通量的1％以下。这表明在生产的浓缩溶液中回收了超过99.2％的DMI进料到系统中。分析了进料和吹扫气流的温度和流速的影响，以开发出简单的经验模型，该模型代表了蒸气渗透和通过中空纤维膜的DMI损失。所提出的模型已成功地应用于过程的规模化，同时基于总膜面积，热量需求和空气消耗的同时最小化，对过程进行了初步的多目标优化。最高进料温度和空气流量（以及相应的高昂的运行成本）是最佳条件，但所需的过大膜面积暗示着直接工业应用的非竞争性选择。

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