Formation of Hollow Fiber Membranes via TIPS

通过 TIPS 形成中空纤维膜

• 批准号: 0004534
• 负责人: Douglas Lloyd
• 金额: $ 33.08万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-08-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0004534&HistoricalAwards=false
• 关键词: Formation; Hollow; Fiber; Membranes; via

CTS-0004534Douglas R. LloydUniversity of TexasABSTRACTPolymeric membranes in flat sheet and hollow fiber form are the basis of many industrial separation processes. The advantages of the hollow fiber geometry in membrane processes are well documented in the literature. Traditionally, phase inversion techniques have been used to make the hollow fibers from glassy polymers. In 1981, the thermally induced phase separation (TIPS) method for making flat sheet membranes was introduced. TIPS allows the production of high performance membranes from a broader range of polymeric materials that offer performance advantages over phase inversion membranes for certain applications because of greater thermal and chemical stability. For example, potential applications include separations involving of strong organic solvents and high concentrations other harsh chemicals, separations involving elevated temperatures, purification of etching solutions in the micro-electronics industry, lactic acid recovery in the food industry, and separation of toxic pollutants, pharmaceutics, and fermentation products, as well as membrane distillation. In many of these membrane applications, it is essential to have an anisotropic membrane with well controlled pore structure. The objective of the proposed research is to provide the requisite fundamental knowledge necessary to control porous structure in anisotropic, microporous, hollow fiber membranes produced via TIPS.This research project constitutes a systematic and fundamental study to characterize and model the impact of system physical properties and processing parameters on the processability, microscopic and macroscopic structure, and performance of hollow fiber membranes formed via the TIPS process. Through a balance of modeling and experiments, this research is generating the fundamental knowledge needed to control the concentration and temperature gradients in the homogeneous solution and to develop the process for the formation of anisotropic hollow fibers on a laboratory scale. A fully coupled heat-, mass-, and momentum-transfer model for predicting the temperature, concentration and velocity profiles within the nascent membrane at the time of phase separation and surface pore size after quenching is being devised.

CTS-0004534Douglas R. Lloyd 德克萨斯大学摘要平板和中空纤维形式的聚合物膜是许多工业分离过程的基础。 中空纤维几何形状在膜工艺中的优点在文献中有详细记载。 传统上，相转化技术已用于由玻璃状聚合物制造中空纤维。 1981年，引入了用于制造平板膜的热致相分离（TIPS）方法。 TIPS 允许使用更广泛的聚合物材料生产高性能膜，这些材料由于具有更高的热稳定性和化学稳定性，在某些应用中比相转化膜具有性能优势。 例如，潜在的应用包括涉及强有机溶剂和高浓度其他刺激性化学品的分离、涉及高温的分离、微电子工业中蚀刻溶液的净化、食品工业中的乳酸回收、有毒污染物、药品和发酵产物的分离以及膜蒸馏。 在许多此类膜应用中，至关重要的是具有良好控制孔结构的各向异性膜。本研究的目的是提供控制通过 TIPS 生产的各向异性、微孔、中空纤维膜的多孔结构所需的必要基础知识。该研究项目构成了一项系统的基础研究，旨在表征和模拟系统物理性质和加工参数对通过 TIPS 工艺形成的中空纤维膜的可加工性、微观和宏观结构以及性能的影响。 通过建模和实验的平衡，这项研究正在产生控制均匀溶液中的浓度和温度梯度以及开发在实验室规模上形成各向异性中空纤维的工艺所需的基础知识。 正在设计一种完全耦合的热、质量和动量传递模型，用于预测相分离时新生膜内的温度、浓度和速度分布以及淬火后的表面孔径。