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Organic and inorganic composite hydrophobic film and its preparing process

An inorganic composite, hydrophobic membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation and other directions, can solve the problems of high brittleness, strong alkali resistance, organic solvent and other problems, achieve small swelling and simple preparation method Effect

Active Publication Date: 2006-01-25
JIANGSU JIUMO HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the research and development of hydrophobic membranes has a history of decades, the separation coefficient and flux of membranes still need to be further improved.
In addition, a single organic hydrophobic membrane is not resistant to high temperature and organic solvents, is easy to block, and is not suitable for cleaning, while a single inorganic hydrophobic membrane has disadvantages such as strong alkali resistance, high brittleness, and low elasticity.

Method used

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  • Organic and inorganic composite hydrophobic film and its preparing process
  • Organic and inorganic composite hydrophobic film and its preparing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 40g of polydimethylsiloxane in 80mL of n-heptane, add 4g of ethyl orthosilicate, disperse evenly with ultrasound, then add 8 drops of dibutyltin dilaurate and stir evenly, let it stand for defoaming, and prepare into a coating solution. The outer film is coated on the tubular mullite support by the dipping method, and the film is applied once, and the coating time is 1min. After the coated composite film was cross-linked and cured at room temperature for one day, it was dried at 120°C for 4 hours, then soaked in acetone for half an hour, and then dried at 120°C for 4 hours.

[0021] Put the composite membrane prepared in this example in 60°C, the concentration is 4.24wt% ethanol aqueous solution, under the vacuum condition of 520Pa, the total permeation flux of the membrane is measured as 60g m -2 h -1 , the separation factor is 98.

Embodiment 2

[0023] Dissolve 50g of polydimethylsiloxane PDMS in 150mL of n-heptane, add 4g of tetraethyl orthosilicate TEOS, and disperse evenly with ultrasound, then add 10 drops of dibutyltin dilaurate and stir evenly, let it stand for defoaming Get coating solution. The film was coated on the flake mullite support by the spin method, and the film was coated three times, and the coating time was 1 min each time. After the coated composite film was cross-linked and cured at room temperature for one day, it was dried at 120°C for 4 hours, then soaked in acetone for half an hour, and then dried at 120°C for 4 hours.

[0024] Put the composite membrane prepared in this example in 10.12wt% ethanol aqueous solution at 70°C, and under the vacuum condition of 440Pa, the total permeation flux of the membrane was measured to be 420g m -2 h -1 , the separation coefficient is 9.1.

Embodiment 3

[0026] Dissolve 30g of polydimethylsiloxane PDMS in 180mL of n-heptane, add 3g of tetraethyl orthosilicate TEOS, disperse evenly with ultrasound, then add 6 drops of dibutyltin dilaurate, stir evenly, and let it stand for defoaming Get coating solution. In tubular Al 2 o 3 The outer film is coated on the support body by dip coating method, and the film is applied three times, and the coating time is 1min each time. After the coated composite film was cross-linked and cured at room temperature for one day, it was dried at 120°C for 4 hours, then soaked in acetone for half an hour, and then dried at 120°C for 4 hours.

[0027] Put the composite membrane prepared in this example at 60°C in an aqueous ethanol solution with a concentration of 0.97wt%, and under a vacuum of 480Pa, the total permeation flux of the membrane was measured to be 124g m -2 h -1 , the separation coefficient is 14.4.

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Abstract

A composite organic-inorganic hydrophobic membrane for separating alcohol or other organic substances from aqueous solution is composed of inorganic ceramic substrate and organic polydimethyl siloxane layer. Its preparing process includes such steps as dissolving polydimethl siloxane in n-heptane, adding ethy / silicate, ultrasonic dispersing, dripping tin dibutyl bilaurate in it, stirring, de-foaming, coating it one said substrate, solidifying while cross linking, thermal drying, immersing in acetone for 30 min, and thermal drying.

Description

technical field [0001] The invention relates to an organic-inorganic composite hydrophobic membrane for separating organic matter from water and a preparation method thereof. Background technique [0002] Pervaporation is a new type of liquid mixture separation technology, which is driven by the partial pressure difference of the component vapor, and uses the difference in the dissolution and diffusion speed of the components through the dense membrane to realize the separation process of the components. It has the characteristics of high efficiency, high adaptability, low energy consumption, easy amplification, easy coupling and integration with other processes, convenient operation, no pollution to products and the environment, and can be used to separate heat-sensitive substances. At present, ethanol produced by biological fermentation is considered to be a promising renewable energy source, but in the fermentation process, it is necessary to continuously separate alcohol...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/10B01D71/70
Inventor 徐南平金万勤相里粉娟陈祎玮
Owner JIANGSU JIUMO HIGH TECH CO LTD
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