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Method for preparing distillation film with support body

A technology of distillation membrane and support body is applied in the field of preparation of distillation membrane with support body, which can solve the problems of weak anti-pollution ability of microporous membrane, uncontrollable pore size and high preparation cost, and achieves good anti-pollution performance, The membrane pores are uniform and easy to control, and the mass transfer resistance is small.

Inactive Publication Date: 2015-07-29
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has high water flux, its preparation method is complicated and the cost of preparation is relatively high
The patent document with the publication number CN102303407A discloses a method for preparing polytetrafluoroethylene film by three-dimensional stretching, which has the advantages of simple equipment and low energy consumption, but the pore size cannot be controlled uniformly due to solute stretching.
The patent document with the publication number CN103481528A discloses a method for preparing biaxially stretched porous expanded polytetrafluoroethylene expanded hollow tubular membrane, which has good chemical stability and high strength. However, the micropores prepared by this method Membrane anti-fouling ability is not strong, and the cost is high

Method used

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  • Method for preparing distillation film with support body
  • Method for preparing distillation film with support body
  • Method for preparing distillation film with support body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] First, the PVDF powder was vacuum-dried at 60°C for 24 hours, and the dried PVDF and PVP powders were added in proportions of 14% and 4% to the flasks containing 5% and 78% PDMS and DMAC solutions and stirred for 24 hours to obtain transparent Uniform casting solution, let stand for 24h to defoam. Pour the casting liquid onto a clean glass plate attached to a polyester screen, and quickly and evenly distribute it with a scraper with a certain thickness. In deionized water, after 10 minutes, take out the glass plate and put it in a large amount of deionized water, soak the membrane in water for at least 3 days, and change the deionized water frequently to completely remove the residual solvent.

[0035] Distilled membranes were prepared according to the following parameters:

[0036]

[0037]

[0038] The above-prepared distillation membranes were subjected to membrane distillation experiments, see figure 2 , using direct contact, the hot end is a 5% Nacl soluti...

Embodiment 2

[0040] First, the PVDF powder was vacuum-dried at 65°C for 24 hours, and the dried PVDF and PVP powders were added in proportions of 12% and 6% to flasks containing 5% and 77% PDMS and DMAC solutions and stirred for 24 hours to obtain transparent Uniform casting solution, let stand for 24h to defoam. Pour the film-casting liquid onto a clean glass plate attached to a polyester screen, and quickly and evenly distribute it with a scraper with a certain thickness. In the process of deionization, after 10 minutes, take out the glass plate and put it in a large amount of deionized water, and store it for at least 3 days, and the deionized water must be changed frequently to completely remove the residual solvent.

[0041] The preparation of the distillation membrane was carried out according to the following parameters:

[0042]

[0043]

[0044] The membrane distillation experiment of the obtained distillation membrane is the same as that in Example 1. The test results of ...

Embodiment 3

[0046] First, the PVDF powder was vacuum-dried at 70°C for 24 hours, and the dried PVDF and PVP powders were added in proportions of 13% and 2% to the flasks containing 5% and 79% PDMS and DMAC solutions and stirred for 24 hours to obtain transparent Uniform casting solution, let stand for 24h to defoam. Pour the film-casting liquid onto a clean glass plate attached to a polyester screen, and quickly and evenly distribute it with a scraper with a certain thickness. In deionized water, after 10 minutes, take out the glass plate and put it in a large amount of deionized water, keep it for at least 3 days, and change the deionized water frequently to completely remove the residual solvent.

[0047] Distilled membranes were prepared according to the following parameters:

[0048]

[0049] The membrane distillation experiment of the obtained distillation membrane is the same as that in Example 1. The test result of the distillation membrane is that the permeation flux can reac...

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Abstract

The invention provides a method for preparing a distillation film with a support body. The method comprises the following steps: conducting vacuum drying on PVDF powder; mixing the dried PVDF powder with an additive; stirring for dissolving, so as obtain a transparent uniform casting solution; allowing the casting solution to stand still or putting the casting solution in a vacuum drying box for bubble removing; pouring the non-bubble casting solution on a clean glass plate attached with a polyester screen mesh; fast distributing the non-bubble casting solution to be uniform with a scraper; allowing a nascent film to stand still in the air; immersing the nascent film together with the glass plate into deionized water of which the temperature is constant for 10 min; removing the glass plate; putting the immersed film into a great amount of deionized water; replacing the deionized water frequently; carrying out preservation for at least 3 days. The film prepared according to the method is high in mechanical strength, flux and interception rate, and low in cost.

Description

technical field Background technique [0001] Membrane separation technology is recognized as one of the last important new technologies in the 21st century. Membrane separation technology is increasingly showing its important role and bright prospects in daily life. As a new separation technology, membrane separation technology has been widely used in gas separation, material separation and water treatment, among which the demand for membrane products is the largest in the field of water treatment. [0002] Compared with pressure-driven membrane separation technologies such as ultrafiltration, nanofiltration, and reverse osmosis, membrane distillation technology has the following advantages: (1) it can operate under normal pressure, and the equipment is simple in structure and easy to operate; (2) the membrane pores are only There is steam that can pass through, and the desalination rate of membrane distillation can reach 100% in theory; (3) It can handle high-concentration ...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/10B01D67/00B01D61/36
Inventor 赵方波吴瑶于振江卢佳琦赵元元李静春
Owner HARBIN ENG UNIV
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