Conductive hydrophobic membrane and preparation method thereof, and electrothermal membrane distillation assembly containing same

A hydrophobic membrane and electrothermal membrane technology, applied in the field of electrothermal membrane distillation components and conductive hydrophobic membranes, can solve the problems of large hydraulic cycle energy consumption, large heating energy consumption, and difficult drying process, so as to reduce heating energy consumption and simplify drying Good process and electric heating performance

Pending Publication Date: 2019-10-22
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, on the one hand, the traditional membrane distillation process needs to heat all the circulating water on the feed liquid side, which requires a large heating energy consumption; on the other hand, the traditional membrane distillation process needs to maintain a certain flow rate of the feed liquid side to alleviate the temperature polarization , to ensure the efficiency and water production of membrane distillation, it requires a large energy consumption of hy...

Method used

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  • Conductive hydrophobic membrane and preparation method thereof, and electrothermal membrane distillation assembly containing same
  • Conductive hydrophobic membrane and preparation method thereof, and electrothermal membrane distillation assembly containing same
  • Conductive hydrophobic membrane and preparation method thereof, and electrothermal membrane distillation assembly containing same

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preparation example Construction

[0043] According to some embodiments of the present invention, there is also provided a method for preparing the above conductive hydrophobic film, comprising the following steps:

[0044] (1) providing a hydrophobic microporous membrane;

[0045] (2) Forming a porous conductive layer on the hydrophobic microporous membrane.

[0046] In some embodiments, the porous conductive layer is graphene, and step (2) specifically includes the following sub-steps:

[0047] (2A) spraying the graphene oxide dispersion liquid on the surface of a hydrophobic microporous membrane multiple times, until the surface of the hydrophobic microporous membrane is completely covered by graphene oxide, and preparing a graphene oxide composite hydrophobic membrane;

[0048] Preferably, the graphene oxide dispersion is an aqueous dispersion, N,N-dimethylformamide dispersion or N,N-dimethylacetamide dispersion; the concentration of the dispersion is less than 10mg / mL, which is conducive to uniform spray ...

Embodiment 1

[0065] This embodiment provides a method for preparing a conductive hydrophobic membrane used in the electrothermal membrane distillation process, and the specific process is as follows:

[0066] (1) The unsupported polytetrafluoroethylene hydrophobic microporous membrane (average pore diameter 0.22 μm, thickness about 30 μm, water contact angle about 140°, porosity 76%) is evenly pasted on the flat ceramic sheet surface; the ceramic The plate is placed on a flat temperature-controlled heater, with the microporous membrane side up, and the set temperature is 85°C;

[0067] (2) Spray 30mL of graphene oxide DMF (N, N-dimethylformamide) dispersion (concentration is 2mg / mL) evenly on the surface of hydrophobic microporous membrane with a sprayer, and then dry to prepare graphene oxide - Polytetrafluoroethylene composite hydrophobic membrane;

[0068] (3) Transfer the graphene oxide-polytetrafluoroethylene composite hydrophobic film to a tube furnace, and perform thermal reduction...

Embodiment 2

[0071] This embodiment provides a method for performing air-gap electrothermal film distillation using the conductive hydrophobic film as described above, comprising the following steps:

[0072] (1) The conductive hydrophobic membrane obtained in embodiment 1 is made into a flat membrane element, and assembled into a membrane module for electrothermal membrane distillation;

[0073] Among them, such as Figure 7 and 8(b) As shown, the two sides of the membrane element are the feed liquid side and the water production side respectively, and a cold wall is arranged on the water production side and the membrane element with an air gap. The hydrophobic microporous membrane layer of the conductive hydrophobic membrane is located on the feed liquid side, the graphene conductive layer is located on the water production side, and the cold wall side is fed with condensed water at 5°C. Condensed water is provided by water storage tank 9, and its circulation temperature is controlled ...

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Abstract

The invehe invention provides a conductive hydrophobic membrane and a preparation method thereof, and an electrothermal membrane distillation module containing the same. The conductive hydrophobic membrane comprises a hydrophobic microporous membrane layer and a porous conductive layer, wherein the porous conductive layer is formed on the hydrophobic microporous membrane layer. The conductive hydrophobic membrane is made into the membrane module for electrothermal membrane distillation; the hydrophobic microporous membrane layer of the conductive hydrophobic membrane is located at a feed liquid side, and the graphene conductive layer of the conductive hydrophobic membrane is located at a water production side; and an air gap type, an air sweeping type or vacuum condensing structure is adopted at the water production side. The porous conductive layer converts electrical energy into thermal energy during distillation of an electrothermal membrane, and the thermal energy is transmitted tothe feed liquid side for heating of feed liquid. According to the invention, energy input for feed liquid heating and feed liquid circulation in the process of membrane distillation can be reduced; the problem of membrane pore wetting caused by capillary condensation in the process of membrane distillation can be alleviated; the membrane can be rapidly dried after the membrane is wetted and cleaned; and long-term low-consumption stable operation of membrane distillation technology is realized.

Description

technical field [0001] The invention belongs to the field of water treatment and industrial desalination, specifically relates to the technical field of electrothermal process and membrane separation, and in particular relates to a conductive hydrophobic membrane, its preparation method and an electrothermal membrane distillation assembly containing it, so as to reduce the operating energy consumption of the membrane distillation process, Relieves membrane wetting and enables rapid membrane drying. Background technique [0002] Membrane distillation is an emerging membrane separation process in recent years. Membrane distillation technology can be used in sewage and wastewater treatment, seawater and brackish water desalination, salt crystallization and other fields, and can be used as an alternative technology for reverse osmosis technology. Membrane distillation technology has attracted more and more attention due to its advantages such as low operating pressure, high salt...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D67/00B01D61/36
CPCB01D61/364B01D61/366B01D67/0079B01D69/02B01D2325/26B01D2325/38
Inventor 王军李魁岭张勇侯得印徐莉莉曹爱新
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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