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High-flux molecular-sieve alcohol permselective membrane and preparation method thereof

A molecular sieve, high-throughput technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of reducing hydrophobic performance, low molecular sieve membrane flux, thick molecular sieve membrane thickness, etc., and achieve good hydrophobic performance. , high separation factor, the effect of reducing mass transfer resistance

Active Publication Date: 2010-12-22
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to literature reports, the flux of Silicalite-1 molecular sieve membranes is generally low. The reason may be that during the preparation of molecular sieve membranes, the aluminum element in the mullite or alumina support penetrates into the Silicalite-1 molecular sieve framework, which reduces its hydrophobicity. ;The thickness of Silicalite-1 molecular sieve membrane is thick

Method used

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  • High-flux molecular-sieve alcohol permselective membrane and preparation method thereof
  • High-flux molecular-sieve alcohol permselective membrane and preparation method thereof
  • High-flux molecular-sieve alcohol permselective membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Preparation of Example 1 Porous YSZ Hollow Fiber Support

[0033] Add polyvinylpyrrolidone into N-methyl-2-pyrrolidone, dissolve and then add polyethersulfone, stir until fully dissolved, then add yttrium-stabilized zirconia powder (commercially available, containing 3-8% mol of yttrium oxide) in batches ); the mass ratio of yttrium-stabilized zirconia to polyethersulfone, N-methyl-2-pyrrolidone and polyvinylpyrrolidone is 10:1:4.87:0.08. After the raw materials are fully stirred, they are moved into a stainless steel storage tank, and then extruded into a hollow fiber shape. After drying at room temperature, they are sintered at 1200-1600°C to form a YSZ hollow fiber support body.

[0034]The pore size and porosity of the YSZ hollow fiber support are shown in Table 1: as the sintering temperature increases, the average pore size decreases gradually and the porosity decreases. figure 1 It is the surface electron micrograph of the YSZ hollow fiber support sintered at 1...

Embodiment 2

[0037] Example 2 Synthesis of Silicalite-1 molecular sieve membrane with YSZ hollow fiber as support body

[0038] Self-made nano-scale Silicalite-1 molecular sieve particles were used as seed crystals, the seed crystal suspension was diluted with hydroxypropyl cellulose (HPC) and deionized water, and then the pH was adjusted to 3-4. The YSZ hollow fiber with an average pore size of 0.67 μm and a porosity of 56% was selected as a support, immersed in the seed crystal suspension for 3-5 seconds, dried and calcined at 450°C. From electron micrographs ( image 3 ) It can be seen that the surface of the support is evenly coated with Silicalite-1 molecular sieve seeds.

[0039] Take 5.66ml of tetrapropylammonium hydroxide with a concentration of 1M, 4ml of analytically pure tetraethyl orthosilicate and 52.5ml of deionized water and mix evenly (that is, the molar ratio of the three is 1:3.2:560) to prepare the secondary growth mother solution ; Place the seed crystal-coated suppor...

Embodiment 3

[0041] Example 3 Synthesis of Silicalite-1 molecular sieve membrane with YSZ hollow fiber as support body

[0042] The molar ratio of tetrapropylammonium hydroxide, tetraethylorthosilicate and water is controlled to be 1:4:692, and the hydrothermal synthesis is carried out at 180° C. for 24 hours. All the other conditions are the same as in Example 2.

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Abstract

The invention relates to a high-flux molecular-sieve alcohol permselective membrane and a preparation method thereof. The high-flux molecular-sieve alcohol permselective membrane is composed of a support body and a membrane layer, wherein the support body is yttrium-stabilized zirconia porous material, the membrane layer is a Silicalite-1 molecular sieve membrane, the average pore size of the support body is 0.1-5 mu m, and the porosity is 10-75%. The invention also discloses a preparation method of the hollow fiber alcohol permselective membrane. The alcohol permselective membrane has outstanding separating property. When the alcohol permselective membrane is used in an ethanol / water system, the permeation flux is enhanced by 3-20 times. The alcohol permselective membrane has higher separation factor and favorable repetitiveness, and especially has favorable effect since the alcohol permselective membrane is composed of the hollow fiber support body. The alcohol permselective membrane is used in the fields of permeating vaporization, gas separation and the like, and has important meaning in the industrial application of alcohol fermentation liquor concentration.

Description

technical field [0001] The invention relates to a permeable membrane, in particular to a high-throughput molecular sieve alcohol permeable membrane and a preparation method thereof, belonging to the field of inorganic membranes. Background technique [0002] As a clean and efficient renewable energy, ethanol can effectively replace some fossil fuels, so it is highly valued by countries all over the world. At present, the production of fuel ethanol mainly adopts biomass fermentation method, and Brazil, the United States, China and other countries have realized large-scale production of fuel ethanol. Based on the difference of biomass and fermentation process, the ethanol concentration obtained by the biomass fermentation method is generally 1-15%. Since ethanol has a strong inhibitory effect on bacterial fermentation, the ethanol in the fermentation liquid must be separated in time to realize The continuous and long-lasting fermentation process improves production efficiency...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/08B01D67/00
Inventor 顾学红束小君王学瑞徐吉上徐南平
Owner NANJING UNIV OF TECH
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