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Composite membrane structure for desalting air gap type membranes

A composite membrane and thin film technology, applied in the field of chemical engineering, can solve the problems of unit flux limitation and increase the complexity of the structure, and achieve the effects of simplifying the structure, increasing the unit water purification capacity, and increasing the unit steam throughput

Inactive Publication Date: 2017-01-04
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the thickness constraint of the interlayer, the unit flux of membrane desalination with air gap structure is limited
In addition, the improvement of the air gap structure also includes adding porous media such as sponge and sand in the gap ([3] Francis L, Ghaffour N, Alsaadi A A, et al.Materialgap membrane distillation: a new design for water vapor flux enhancement [J].Journal of membrane science,2013,448:240-247.), this method can also effectively improve the unit flux of membrane desalination, but it also increases the complexity of the structure

Method used

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  • Composite membrane structure for desalting air gap type membranes
  • Composite membrane structure for desalting air gap type membranes

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Embodiment Construction

[0010] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0011] A film of composite structure or post-processing of an existing film, comprising a film layer and a coarse fiber layer. The desalination film layer is a hydrophobic material, and the thick fiber layer can be either a hydrophobic material or a hydrophilic material. The material of the thick fiber can be a hydrophilic material, such as nylon, etc.; it can also be a hydrophobic material, such as polyvinylidene fluoride, polytetrafluoroethylene, polypropylene, etc.

[0012] The invention is a novel composite membrane material in which thick fibers are attached to the membrane. The production method can directly spray and attach the crude fiber to the film; it can also make the crude fiber in advance and then attach it to the existing film. Coarse fibers can be produced by spinning technology, or by stretching a...

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Abstract

The invention belongs to the field of chemical engineering technology, and is a composite membrane structure for desalting air gap type membranes. The crude fiber of the invention is attached to the desalination membrane in an irregular manner to form a composite membrane structure, and the composite membrane is directly applied to the air gap type membrane desalination without adding additional spacers. The effect and benefit of the invention is to simplify the existing air gap type membrane desalination module structure, increase the unit throughput of steam, and increase the unit water purification capacity of the air gap type membrane desalination.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering, relates to membrane separation related technologies, in particular to a composite membrane structure applied to air-gap membrane desalination. Background technique [0002] Membrane desalination is a separation technology, a new membrane separation process combining membrane separation technology and traditional evaporation process. Like conventional distillation, it is based on vapor-liquid equilibrium and relies on latent heat of vaporization to achieve phase change. It uses the vapor pressure difference of the transfer components caused by the temperature difference on both sides of the membrane as the mass transfer driving force, and uses the hydrophobic microporous membrane that is not wetted by the solution to be treated as the transfer medium. The core of membrane separation technology is the membrane itself. The inherent chemical properties and physical structure of the mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00C02F1/44B32B27/12B32B7/08B32B33/00
CPCB01D67/00B01D67/0081B01D67/0083B01D69/12C02F1/44B32B7/08B32B27/12B32B33/00B01D2323/30Y02A20/131
Inventor 郭飞蔡景成
Owner DALIAN UNIV OF TECH
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