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Structure and Transfer Performances of Polyamide Composite Menbrane

Author: FengWenZuo
Tutor: CaiBangXiao
School: Zhejiang Technology and Business University
Course: Of Food Science
Keywords: Polyamide (PA) Polyvinyl alcohol ( PVA ) Multi-layer composite film ( MLCM ) Microstructure Pervaporation ( PV ) Isopropanol / water mixture
CLC: TQ028.8
Type: Master's thesis
Year: 2008
Downloads: 158
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Abstract


Membrane science and technology is an emerging high-tech, but also an interdisciplinary science and technology. Membrane separation process, has become a significant manufacturing of food processing, biopharmaceutical, water separation and purification process, and to obtain a wide range of applications. A variety of membrane separation process, especially the structure and properties of membrane as the main determining factor. Therefore, the film material and the film formation conditions, how to control its structure, as well as the transfer process of the film, the film SCIENCES TECHNICAL FIELD important content. In recent years, aimed at food processing, bio-pharmaceutical and other fields, the separation of organic / water mixture to reverse osmosis (RO) desalination aromatic polyamide (PA) composite film to support the film coating prepared poly vinyl alcohol (PVA) / PA composite membrane, and interfacial polymerization (IP) the prepared multilayer PA composite membrane technology has been more systematic study. However, the separation layer as a single layer structure of the composite film in terms of performance will be a complex process and some limitations of a single material. Therefore, two different combination of film-forming method, preparing the separation layer for multilayer having an alternating structure of high-performance composite membrane - alternating multilayer composite film (MLCM), is an innovation of the film-forming technique. PVA-based film, PA film having high water permeability and the organic matter has a certain characteristic of the separation ability in the PA class RO composite film, a thin film layer and the IP process to give the PA polymer layer is formed by dip coating PVA, to enhance the permeability of the composite membrane to compensate for low PA membrane separation performance, development of PV separating organics / water mixture having a special separation of the layer structure of a new type of MLCM. This method does not need a special film equipment and excessive polymer materials, requires only two dipping and IP process, you can get excellent performance of the PA composite membrane, the process equipment is simple, safe and easy to operate, easy to control the preparation conditions. By modern instruments atomic force microscope (AFM) and scanning electron microscopy (SEM) structure on MLCM surface observation analysis, determined by alternating composite technology will be used in RO commodity PA membrane modified to become MLCM has a uniform and dense separation layer, so that the the MLCM microstructure and Select permeability, two aspects have been optimized. IP technology obtained PA layer is a mesh PA polymer having a three dimensional structure, to increase the specific surface area of ??the membrane, at the same time having to tighten a loose asymmetric dense structure, to improve the effective permeation area of ??the functional layer, and is beneficial to the membrane selectivity and increased flux; dipping PVA crosslinked layer play three roles, the first IP reaction to provide good support for the body to provide good conveying passage preferentially permeate through PA cortex, followed by the separation of the PV selective separation, again will the PA layer permeate through item level again, dual-selective separation function. The combination of composite technology for solving the problem of the other composite technology composite membrane separation performance vary depending on the inherent properties of a single material, enhance conducive Select permeability of the composite membrane; the hydrophilic bilayer structure of PA / PVA, reduced to a single the thickness of the separation layer is conducive to increased permeation flux of the composite membrane. PA / PVA / PA composite membrane preparation and delivery performance experiments showed that: (1) using the following process conditions prepared MLCM good separation performance for PV separation isopropanol (IPA) / water mixture, the permeate water content (C PH 2 O ) is greater than 99% by weight. The dipping process conditions: PVA Quality Score for the 2 wt% glutaraldehyde for 3 wt%, the heat treatment conditions of 150 ° C, 1h; the IP process conditions: aqueous phase solution of the intermediate-phenylenediamine (m-PDA) 0.2wt% the immersion time is 20min, the organic phase solution in n-hexane (solvent) of pyromellitic acid chloride (TMC) 0.07wt%, the immersion time for 20 seconds, the reaction under the conditions of 50 ° C for 5min, and polycondensation. (2) PA / PVA / PA MLCM permeation flux (J) and the separation factor (alpha) with the feed solution concentration of IPA (C F-IPA ) as well as the operating temperature (T) are closely related. With the C F-IPA and the improvement of the value of T, C PH 2 O is always greater than 99% by weight. Through regression of experimental data, the predictable PA / PVA / PA MLCM flux J value of the mass transfer empirical correlation: the component water infiltration flux: the J W = 0.059 (C < sub> F-IPA ) 2 -9.3179C F-IPA 434.11 component of IPA permeate flux: J IPA = the (C F-IPA 2 ) 0.0007 -0.1133 the (C F-IPA ) 4.5859 Total fluxes associated with T-type: J = 67171.21 exp (-1940.6 / T) (3) PA / PVA / PA MLCM can use various types of porous membrane as a supporting film having good stability and wide applicability, and its preparation process. (4) after repeated experiments run as well as long-term storage of PA / PVA / PA MLCM still has a good stability of the PV separation performance of the IPA / water mixture. (5) PA / PVA / PA MLCM suitable for a separation of various concentrations of IPA / water mixture. Coupled with distillation distillation / PV / distillation integration process simulation show that, MLCM the penetration capacity of 200 to 270g / m 2 · h through a water content greater than 99.4wt%, which has excellent separation efficiency. Obviously, a special multi-layer the alternating separation layer structure high separation performance of PA / PVA / PA composite film can be widely used in the separation and purification of food, biological, pharmaceutical engineering a large number of solvent IPA / water mixture. Will be displayed in the actual separation engineering, engineering applications and economic significance.

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical processes ( physical processes and physical and chemical processes ) > Separation process > New separation method
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