Preparation of Pervaporation Membranes

渗透汽化是一种很有前途的新型膜分离技术 溶剂混合物。 这家公司最近在开发 采用螺旋形薄膜复合膜的渗透蒸发系统， 缠绕膜组件。 他们建议开发改进的膜 以及分离少量溶解的 亲水性极性溶剂与水分离。 这些解决方案代表了 渗透蒸发的机会很大。 在第一阶段计划中， 他们将在小范围内展示这一概念的总体可行性， 0.1-0.2平方米螺旋卷式膜组件。 II期 程序，最有前途的膜将被优化。 这些 结果将被用来完成一个技术和经济 过程分析。 渗透汽化是一种很有前途的分离低浓度有机物的新型膜分离技术 从溶液中浓缩挥发性溶质。 比如说， 有机分子，如汽油中的有机分子， 通过使溶液通过膜单元，其中 膜对有机分子是可渗透的，但对水是不可渗透的。 这比能源密集型工艺（如 蒸馏，因为水不需要加热。 目前， 然而，没有商业膜系统可以分离 更像水的分子， 例如乙醇。 膜的发展与此 这种能力将使渗透蒸发过程扩展到 分离的重要类别。 该公司建议测试 几种潜在的膜系统来执行这种操作的可行性 第一阶段的分离 最成功的膜 然后在第二阶段进行优化， 对这一过程进行全面的技术和经济分析， 聚集。

Pervaporation is a promising new membrane process for the separation of solvent mixtures. This firm has recently been developing pervaporation systems using thin-film composite membranes in spiral- wound membrane modules. They propose to develop improved membranes and processes for the separation of small amounts of dissolved hydrophilic polar solvents from water. These solutions represent a considerable opportunity for pervaporation. In the Phase I program, they will demonstrate the overall feasibility of the concept in small 0.1-0.2 square meter spiral-wound membrane modules. In the Phase II program, the most promising membranes would be optimized. These results would then be used to complete a technical and economic analysis of the process. Pervaporation is a promising new membrane process for separating a low concentration of a volatile solute from solution. For example, organic molecules like those found in gasoline can be removed from water by passing the solution through a membrane unit in which the membrane is permeable to the organic molecules, but not to the water. This is much less expensive than an energy intensive process like distillation, since the water does not have to be heated. Currently, however, there are no commercial membrane systems which can separate a more water-like molecule, such as ethanol, from water. Development of membranes with this capability would extend the process of pervaporation to this important class of separations. The company proposes to test the feasibility of several potential membrane systems to perform such a separation in Phase I. The most successful membranes would then be optimized in Phase II, and the design data necessary for a complete technical and economic analysis of the process would be gathered.