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

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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 membrane is especially suitable for The membrane distillation process has good anti-pollution performance, the microporous membrane is not easy to be blocked and wetted, and the feed liquid is not easy to pass through the distillation membrane, which can improve the purity of the membrane distillation condensate and prolong the working time of the distillation membrane

Method used

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  • Composite distillation film and preparation method and application thereof

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preparation example Construction

[0013] The preparation method of the composite distillation membrane designed by the present invention is characterized in that the preparation method is as follows: first carry out the functional finishing on the textile support body of the present invention, and then carry out single-sided finishing on one side of the functionally finished textile support body Coating, after coating the casting solution, immerse the textile support coated with the casting solution into the coagulation bath to make the casting solution phase-separated, and obtain a hydrophobicity with separation effect on the textile support through the phase inversion method. The polymer microporous membrane layer can be used to prepare the composite distillation membrane. The thickness of the microporous membrane is required to be 5-100 μm, and the required thickness of the microporous membrane layer can be obtained by adjusting the distance between the scrapers of the coating equipment.

[0014] Since the ...

Embodiment 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 dosage of the finishing agent is 0.1-3g / L, and the technological process is: padding→drying→baking.

[0022] The polymer used for the coating film is polyvinylidene fluoride (0.9 Pa·s, 0.1 g / mL DMAC), and the formula of the casting film is: polyvinylidene fluoride 12%, dimethylformamide 85%, LiCl 3%.

[0023] The preparation of the distillation membrane in this example adopts the method of single-sided coating, and evenly coats a layer of casting liquid on one side of the textile support after the above-mentioned functional finishing, and then immerses the textile support coated with the casting liquid into In the coagulation bath, the casting solution is phase-separated to form a membrane, so that a polymer microporous membrane layer with separation effect is ob...

Embodiment 2

[0030]The functional finishing of the textile support of the distillation membrane is done by polyvinyl alcohol and citric acid. The composition of the finishing solution is as follows: polyvinyl alcohol 40g / L, glyoxal 2g / L, citric acid 2g / L, and the process is: padding→drying Dried → baked. All the other are with embodiment 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°C, relative humidity 90%).

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

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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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