共纺丝法制备中空纤维膜 - 图文

共纺丝法制备非对称LSCF中空纤维膜

2011 年6月

中 文 摘 要

摘 要

本次研究采用共纺丝法，以LSCF粉体、聚醚砜(PESf)、N-甲基-2-吡咯烷酮(NMP)为原料，用N-甲基吡咯烷酮(NMP)和乙醇（EtOH）的混合溶液作为中空纤维膜内部的凝固液，用自来水作为膜外部的凝固液，经过高温烧结，制备出高度非对称的致密La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF)中空纤维透氧膜。采用He为吹扫气，在不同流速、不同温度下，测定双层LSCF中空纤维膜透氧性能。结果显示采用共纺丝法制备的高度非对称中空纤维膜的透氧量在650-1000?C下分别是0.15-4.08 mL.cm-2.min-1。在较低温度下(600~800?C)中空纤维膜透氧量变化较小，但在高温情况下，温度大于800?C时，中空纤维膜的透氧量以直线上升。 关键词：La0.6Sr0.4Co0.2Fe0.8O3-δ；高度非对称；共纺丝法；中空纤维；透氧性能

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Abstract

Abstract

Highly asymmetric LSCF hollow fiber membrane was prepared by co-extrusion, we use LSCF powder, polyether sulfone (PESf), N-methyl-2-pyrrolidone (NMP) as raw mater, the N-methyl-2-pyrrolidone (NMP) and EtOH as internal coagulant, tap water as external coagulant. After high temperature sintering，we can get ighly asymmetric La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) hollow fiber membrane. Oxygen permeation fluxes through the obtained hollow fiber membranes were measured under He gradients at different temperatures and different flow. The results indicate that the highly asymmetric hollow-fiber membranes possess an oxygen permeation flux of 0.15-4.08mL.cm-2.min-1 in the temperature range of 650-1000, We also found that at lower temperatures (600~800?C) hollow fiber membrane changes in oxygen content was smaller, but at high temperatures, the temperature is higher than 800?C, the oxygen permeability of hollow fiber membrane volume to straight up.

Key word: La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF), highly Asymmetric, co-extrusion, hollow fiber, oxygen permeability.

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目 录

目 录

摘要…………………………………………………………………………………..Ⅰ Abstract（英文摘要）……………………………………………………….……..Ⅱ 目录…………………………………………………………………………………..Ⅲ 第一章 文献综述…………………………………………………………………….1 1.1 膜的定义及研究背景………………………………………………………….1 1.2 中空纤维膜的制备方法及原理……………………………………………….2 1.2.1 溶液纺丝法………………………………………………………………..2 1.2.2 熔融纺丝法………………………………………………………………..2 1.2.3 半熔融纺丝法……………………………………………………………..3 1.3 中空纤维膜的应用领域……………………………………………………….3 1.3.1 环保工程…………………………………………………………………..3 1.3.2 石化工业…………………………………………………………………..3 1.3.3 海水淡化…………………………………………………………………..3 1.3.4 食品工业…………………………………………………………………..4 1.3.5 医疗卫生…………………………………………………………………..4 1.4 中空纤维膜发展前景………………………………………………………….4 1.5 LSCF膜的机理…………………………………………………………………4 1.6 LSCF透氧膜的研究及制备方法………………………………………………5 1.7 共纺丝法的制作机理………………………………………………………….6 1.8 共纺丝法制作中空纤维膜制作过程………………………………………….6 第二章 非对称LSCF中空纤维膜的制备…………………………………………..8 2.1 试剂和仪器…………………………………………………………………….8 2.1.1 主要试剂…………………………………… …………………………….8 2.1.2 实验仪器……………………………………………………………………8

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