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Composite material for membrane distillation

A composite material and membrane distillation technology, applied in the field of membrane distillation, can solve the problems of small membrane flux, unsuitable for industrial application, etc., and achieve the effect of small passing resistance, increasing unit processing capacity, and large processing capacity

Inactive Publication Date: 2019-04-02
CHONGQING RUNZE PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing membranes for membrane distillation have a relatively small flux, and none of them are suitable for industrial applications. At present, the membrane flux of membrane distillation membranes used in preliminary engineering can only reach 10L / m when the feed temperature is 70°C. 2 h

Method used

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Examples

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Effect test

Embodiment 1

[0026]A composite material for membrane distillation, which is composed of a hydrophobic porous material layer and a hydrophilic porous material layer. The hydrophobic porous material layer is a commercially available polyvinylidene fluoride microporous membrane. After testing, its porosity is 82%. It is 2µm-4µm, the pores are three-dimensionally connected, and the film thickness is 50µm. After testing with the PT-705D contact angle measuring instrument of Puset Testing Equipment Co., Ltd. according to the operation manual, the water contact angle on the surface of the hydrophobic porous material layer is 113° The hydrophilic porous material layer is a polyimide microporous membrane with a porosity of 84%, a pore size of 5µm-9µm, and three-dimensional interconnected pores. The membrane is prepared by adding thermoplastic Polyimide powder, the ratio of tetrahydrofuran and benzene in the mixed solvent is 1:10 by weight, the solution concentration is 20g / L, fully stirred under nit...

Embodiment 2

[0030] A composite material for membrane distillation, consisting of a hydrophobic porous material layer and a hydrophilic porous material layer, wherein the hydrophobic porous material layer is a polypropylene microporous membrane with a porosity of 85%, a pore size of 4µm-8µm, and three-dimensional pores Three-dimensionally connected, the water contact angle is 146°; the hydrophilic porous material layer is a polypropylene microporous membrane, and the surface of the cavity wall is impregnated with polyacrylic acid / nano-silicon dioxide, and the water contact angle on the surface of the hydrophilic porous material layer is 28° , the porosity is 82%, the pores are uniform, the pore diameter is 3µm-6µm, and the pores are three-dimensionally connected; 50% of the thickness is impregnated with polyacrylic acid / nano silica hydrophilic coating, that is, the hydrophobic porous material layer and the hydrophilic porous material layer are an integrated composite material, and the three...

Embodiment 3

[0032] A composite material for membrane distillation, which is composed of a hydrophobic porous material layer and a hydrophilic porous material layer. The hydrophobic porous material layer is a polyvinylidene fluoride microporous membrane with a porosity of 86% and a pore size of 1µm-2µm. The pores are Three-dimensionally connected, the water contact angle is 151°, and the film thickness is 50 µm; the hydrophilic porous material layer is a polyimide microporous film, prepared according to the method in Example 1, with a porosity of 84%, a pore size of 5 µm-9 µm, and a pore size of 5 µm to 9 µm. It is three-dimensionally connected, after plasma treatment, the water contact angle is 4.5°, and the film thickness is 100µm; HR-5198 glue is used as the adhesive to bond the hydrophobic porous material layer polyvinylidene fluoride microporous membrane and the hydrophilic porous material layer polyamide The imide microporous membrane is made into a composite material for membrane dis...

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Abstract

The invention relates to the technical field of membrane distillation, and provides a composite material for membrane distillation, the composite material is composed of a hydrophobic porous materiallayer and a hydrophilic porous material layer, and pores of the hydrophobic porous material layer and the hydrophilic porous material layer are in three-dimensional three-dimensional communication; and the pores of the hydrophobic porous material layer and the hydrophilic porous material layer at the interface are in three-dimensional three-dimensional communication, and the specific surface areaof the material is greatly increased, so that diffusion of water molecules and condensation of water are facilitated, more water molecules are enabled to pass through a composite membrane, a large membrane flux is realized, the membrane is not easy to block in use, and the composite material has a relatively long service life and is suitable for industrial application.

Description

technical field [0001] The invention relates to the technical field of membrane distillation, in particular to a composite material for membrane distillation. Background technique [0002] Membrane distillation is a new type of separation technology, which is a membrane separation process that uses the vapor pressure difference on both sides of a hydrophobic microporous membrane as the driving force for mass transfer. Membrane distillation is widely used because of its advantages of being able to operate under normal pressure, simple equipment, easy operation, low operating temperature, low-grade heat sources (such as solar energy, geothermal heat, waste heat), high rejection rate, and high-concentration aqueous solution. Used in the preparation of high-purity water, ethanol dehydration, food processing, wastewater treatment, brackish water desalination and seawater desalination. Membrane distillation can process extremely high-concentration inorganic salt solution, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36B01D69/12B01D69/02
CPCB01D61/364B01D69/02B01D69/12B01D2323/345B01D2325/36B01D2325/38
Inventor 叶雷
Owner CHONGQING RUNZE PHARM CO LTD
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