Hydrophobic ceramic hollow fiber membrane applied to membrane distillation and preparation method thereof

A technology of fiber membrane and hydrophobicity, which is applied in the field of preparation of hydrophobic ceramic hollow fiber membranes, can solve the problems of low packing density of membrane modules, low distillation separation efficiency of unit system, and small membrane flux, etc., and achieve long service life, Good high temperature resistance and low mass transfer resistance

Inactive Publication Date: 2011-09-07
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, whether it is a tubular membrane or a flat membrane, the membrane flux is small, resulting in low packing density of the membrane module and low distillation separation efficiency of the unit system.

Method used

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  • Hydrophobic ceramic hollow fiber membrane applied to membrane distillation and preparation method thereof
  • Hydrophobic ceramic hollow fiber membrane applied to membrane distillation and preparation method thereof
  • Hydrophobic ceramic hollow fiber membrane applied to membrane distillation and preparation method thereof

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preparation example Construction

[0035] The invention provides a method for preparing a hydrophobic ceramic hollow fiber membrane used for membrane distillation, comprising the following steps:

[0036] a) mixing ceramic powder, polyethersulfone, N-methyl-1-pyrrolidone and a dispersant, and grinding to obtain a slurry;

[0037] b) extruding the slurry through a spinneret, and obtaining a hollow fiber green body after phase inversion molding;

[0038] c) sintering the hollow fiber body to obtain a ceramic hollow fiber membrane;

[0039] d) modifying the ceramic hollow fiber membrane with silane as a modifier to obtain a hydrophobic hollow fiber membrane.

[0040] In the present invention, ceramic powder, polyethersulfone, N-methyl-1-pyrrolidone and dispersant are used as raw materials, and a ceramic hollow fiber membrane matrix is ​​prepared by a wet phase inversion method, and then the surface of the ceramic hollow fiber membrane matrix is ​​treated. Hydrophobic treatment to obtain a ceramic hollow fiber me...

Embodiment 1

[0060] Mix 10g of polyvinylpyrrolidone, 70g of polyethersulfone, 350g of N-methyl-1pyrrolidone and 570g of alumina powder with an average particle size of 0.7μm and ball mill for 48 hours to obtain a uniform and stable slurry. Gas 30min;

[0061] A spinneret consisting of two concentric tubes with an interlayer gap of 1.0 mm and an inner tube hole diameter of 2.0 mm is used as an extrusion die, and the slurry is extruded through the interlayer gap of the spinneret under a pressure of 0.05 MPa At the same time, under the pressure of 0.02MPa, tap water at 25°C is extruded from the inner tube hole, and the extrudate extruded from the interlayer gap enters tap water at room temperature, undergoes phase inversion solidification molding, and obtains a hollow fiber blank;

[0062] Sintering the hollow fiber body at 1550°C for 15 hours to obtain a ceramic hollow fiber membrane;

[0063] Dissolve 2g of tridecafluorooctyltriethoxysilane in 100g of ethanol, stir evenly, add 2g of water,...

Embodiment 2

[0071] 10g of polyvinylpyrrolidone, 60g of polyethersulfone, 300g of N-methyl-1pyrrolidone and 630g of 3% yttria-stabilized zirconia powder with an average particle size of 0.6 μm were mixed and ball milled for 48 hours to obtain a uniform and stable slurry. Described slurry vacuum degassing 30min;

[0072] A spinneret consisting of two concentric tubes with an interlayer gap of 1.0 mm and an inner tube hole diameter of 2.0 mm is used as an extrusion die, and the slurry is extruded through the interlayer gap of the spinneret under a pressure of 0.05 MPa At the same time, under the pressure of 0.02MPa, tap water at 25°C is extruded from the inner tube hole, and the extrudate extruded from the interlayer gap enters tap water at room temperature, undergoes phase inversion solidification and molding, and obtains a ceramic hollow fiber body;

[0073] Sintering the ceramic hollow fiber body at 1450° C. for 15 hours to obtain a ceramic hollow fiber membrane;

[0074] Dissolve 2g of ...

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Abstract

The invention provides a preparation method of a hydrophobic ceramic hollow fiber membrane applied to membrane distillation. The preparation method comprises the following steps of: a) mixing ceramic powder, polyether sulfone, N-methyl-1-ketopyrrolidine and a dispersant and grinding to obtain slurry; b) extruding the slurry out by using a spinning jet and performing phase conversion molding to obtain a hollow fiber blank; c) sintering the hollow fiber blank to obtain a ceramic hollow fiber membrane; and d) modifying the ceramic hollow fiber membrane by taking silane as a modifier to obtain the hydrophobic ceramic hollow fiber membrane. The hydrophobic ceramic hollow fiber membrane has a hollow fiber structure, a thinner membrane wall and small mass transfer resistance, so that a higher membrane flux is achieved, the filling density of a membrane component is high and the separating effect is good during membrane distillation. Moreover, the ceramic hollow fiber membrane is taken as a substrate of the hydrophobic hollow fiber membrane, so that the hydrophobic hollow fiber membrane has high high-temperature resistance, high structural stability and high restoration and regeneration performance, is easy to clean and has a long service life.

Description

technical field [0001] The invention relates to the technical field of hollow fiber membranes, in particular to a method for preparing a hydrophobic ceramic hollow fiber membrane used for membrane distillation. Background technique [0002] Membrane distillation is a new type of separation technology that combines the distillation process with membrane technology. With a hydrophobic membrane as the medium, under the action of the vapor pressure difference on both sides of the membrane, the volatile components in the feed liquid pass through the membrane pores in the form of vapor. The liquid components and other ions, molecular particles, etc. cannot pass through, so as to achieve separation. Membrane distillation has the advantages of high separation efficiency, mild operating conditions, low requirements for membrane mechanical properties, and low energy consumption. It has a good application prospect in chemical and chemical production. [0003] In 1963, U.S. Patent US32...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00B01D69/08
Inventor 方宏高建峰陈初升
Owner UNIV OF SCI & TECH OF CHINA
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