Composite distillation film and preparation method and application thereof

A distillation membrane and membrane distillation technology, applied in chemical instruments and methods, pervaporation, membrane technology, etc., can solve the problems of prolonging the working time of the distillation membrane, and achieve good anti-pollution, extended working time, and good anti-pollution performance. Effect

Inactive Publication Date: 2008-08-27
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The distillation membrane has a double-layer structure, which overcomes the disadvantage of low strength of the single-layer microporous distillation membrane, and at the same time improves the anti-pollution performance of the distillation membrane; the preparation method has the characteristics of simple process and strong applicability; the distillation membra

Method used

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  • Composite distillation film and preparation method and application thereof
  • Composite distillation film and preparation method and application thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0013] The preparation method of the composite distillation membrane designed in the present invention is characterized in that the preparation method is: first perform the functional finishing on the textile support of the present invention, and then perform single-sided treatment on one side of the functionally finished textile support. Coating: After coating the casting liquid, the textile support coated with the casting liquid is immersed in the solidification bath to make the casting liquid phase separate, and the hydrophobicity with separation effect is obtained on the textile support by the phase inversion method The polymer microporous membrane layer can be used to prepare the composite distillation membrane. The thickness of the microporous film is required to be 5-100 μm, and the required thickness of the microporous film can be obtained by adjusting the distance between the doctor blades of the coating equipment.

[0014] Since the preparation method of the present inve...

Example Embodiment

[0020] Example 1

[0021] The textile support of the distillation membrane is made of polyester filament taffeta fabric, with a weight of 79g / m 2 . The textile support is finished with water and oil repellent finishing agent FK 510, the finishing agent dosage is 0.1-3g / L, and the process flow is: padding→drying→baking.

[0022] The polymer used for the coating is polyvinylidene fluoride (0.9Pa·s, 0.1g / mL DMAC), and the formula of the casting solution is: polyvinylidene fluoride 12%, dimethylformamide 85%, and LiCl3%.

[0023] The preparation of the distillation membrane in this embodiment adopts a single-side coating method. A layer of casting liquid is uniformly applied to one side of the textile support after the above-mentioned functional finishing, and then the textile support coated with the casting liquid is immersed in In the coagulation bath, the casting liquid is phase-separated to form a membrane, thereby obtaining a polymer microporous membrane layer with a separation e...

Example Embodiment

[0029] Example 2

[0030]The functional finishing of the textile support of the distillation film is finished with polyvinyl alcohol and citric acid. The composition of the finishing solution is as follows: polyvinyl alcohol 40g / L, glyoxal 2g / L, and citric acid 2g / L. The process flow is: padding→drying Dry→baking. The rest is the same as in Example 1.

[0031] After inspection, the breaking strength of the distillation film is 685N / 5cm, the peeling strength is 25cN / cm, and the moisture permeability is 6.5kg / m. 2 ·24h (38℃, relative humidity 90%).

[0032] When using this distillation membrane to perform air-gap membrane distillation on an alkaline saturated solution of humic acid, membrane distillation is carried out in such a way that the textile support side and the PVDF microporous membrane side of the distillation membrane of this embodiment are in contact with the feed liquid. Concentration of feed liquid, relative membrane flux J / J 0 (J 0 Is the initial membrane flux) and th...

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Abstract

The invention relates to a composite distillation membrane, as well as the method and the application thereof. The composite distillation membrane is characterized in that the composite distillation membrane is a flat membrane, and is in double-layer structure; one layer is a functional finished textile support body; and the other layer is a composite hydrophobic polymer microporous film coated on the textile support body which is 5 to 100 Mu m thick; the textile support body is made of one of filament woven fabrics of fiber such as Dacron, nylon, polypropylene fiber or mucilage and so on, or non-woven fabrics with the weight ranging from 30g/m<2> to 250g/m<2>; the function finish is at least one of water repellent finish, three-proofing finish, chitosan finish, pva and citric acid finish; the fracture strength of the composite distillation membrane ranges from 400N/5cm to 800N/5cm; the peel strength of the composite distillation membrane ranges from 15cN/cm to 30cN/cm; and the vapour transfer rate ranges from 6kg/m<2>*24h to 9kg/m<2>*24h. During the distillation of the membrane, the textile support body of the composite distillation membrane touches feed liquid. The composite distillation membrane can resist pollution well and is applicable for various membrane distillation processes.

Description

technical field [0001] The invention relates to a membrane technology, specifically a reinforced flat composite distillation membrane with functionally arranged textiles as a support and its preparation method and application. The main international patent classification number is proposed to be Int.Cl.B01D 71 / 00 (2006.01) I. Background technique [0002] Membrane distillation is a membrane separation process that combines distillation technology with membrane technology. The driving force for mass transfer is the vapor pressure difference on both sides of the microporous membrane. The membrane used in the membrane distillation process is called a distillation membrane. The distillation membrane must be a hydrophobic microporous membrane, which should have good hydrophobicity, porosity, mechanical strength, thermal stability and chemical stability. No capillary condensation occurs in the pores. [0003] In the traditional membrane distillation process, the hydrophobic mic...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D61/36
Inventor 霍瑞亭顾振亚
Owner TIANJIN POLYTECHNIC UNIV
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