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Preparation method for organic and inorganic hollow fiber composite membrane

An inorganic hollow fiber and composite membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of complex production process, achieve simple process, improve high temperature resistance, and inhibit swelling.

Active Publication Date: 2012-02-15
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] T.A.Peters et al [T.A.Peters, C.H.S.Poeth, N.E.Benes, H.C.W.M.Buijs, F.F.Vercauteren, J.T.F.Keurentjes.Journal of Membrane Science 276(2006)42-50] reported a hollow fiber ceramic supported polyvinyl alcohol pervaporation membrane, in order to form Thin and defect-free membrane layer, 300nm macroporous inorganic ceramic hollow fiber support modified 4 times with boehmite solution to form γ-Al on macroporous support 2 o 3 The intermediate transition layer finally reaches a pore size of 4nm, and the manufacturing process is complicated

Method used

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  • Preparation method for organic and inorganic hollow fiber composite membrane
  • Preparation method for organic and inorganic hollow fiber composite membrane
  • Preparation method for organic and inorganic hollow fiber composite membrane

Examples

Experimental program
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Effect test

example 1

[0029] (1) The Al doped YSZ with an average pore size of 200 nanometers 2 o 3 After cleaning the surface of the inorganic ceramic hollow fiber support body (Jin Wanqin et al., a method for preparing an alumina-based ceramic hollow fiber membrane, CN 101905121A), soak it in deionized water for 3 days;

[0030] (2) Take 7g of polyvinyl alcohol, add 93g of deionized water, heat to 90°C and stir evenly, remove the insoluble matter by suction filtration after cooling, and let stand; Take 2g of chitosan (deacetylation degree > 90%), add acetic acid content 0.5% (wt) acetic acid aqueous solution 98g, mixed and stirred to a clear and transparent state, suction filtered to remove impurities, and allowed to stand; 30g polyvinyl alcohol solution and 105g chitosan solution were mixed;

[0031] (3) 1.5g maleic anhydride is added in the 10g mixed solution, then drip into 0.15g of 98% (wt) concentrated sulfuric acid, leave standstill for defoaming after stirring;

[0032](4) Immerse the in...

example 2

[0036] (1) Al with an average pore diameter of 200 nanometers 2 o 3 After the surface of the inorganic ceramic hollow fiber support is cleaned, it is immersed in an aqueous ethanol solution with an ethanol content of 5% (wt) for 4 days;

[0037] (2) Take 7g of polyvinyl alcohol, add 93g of deionized water, heat to 90°C and stir evenly, remove insoluble matter by suction filtration after cooling, and let stand;

[0038] (3) 3g of glutaraldehyde was added in 10g of polymer solution, and then 2g of dilute hydrochloric acid with HCl content of 5% (wt) was added dropwise, stirred and allowed to stand for defoaming;

[0039] (4) Immerse the inorganic ceramic hollow fiber support body into the casting solution prepared in step (3), take it out after soaking for 30 seconds, and naturally solidify in the air for 12 hours;

[0040] (5) Immerse the inorganic ceramic hollow fiber support body in the casting solution prepared in step (3) for 30 seconds, and then cross-link and solidify a...

example 3

[0043] (1) After cleaning the surface of the mullite inorganic ceramic hollow fiber support body with an average pore diameter of 400 nanometers, soak it in an aqueous glycerin solution containing 10% (wt) of glycerol for 2 days;

[0044] (2) Take 7g of polyvinyl alcohol, add 93g of deionized water, heat to 90°C and stir evenly, remove the insoluble matter by suction filtration after cooling, and let stand; Take 2g of sodium alginate, add 98g of deionized water to make a uniform solution, pump After filtering to remove impurities, let stand; mix 50g polyvinyl alcohol solution and 50g sodium alginate solution;

[0045] (3) get 5g tartaric acid, add 10g polymer mixed solution, drop into 10gHCl content again and be the dilute hydrochloric acid of 2% (wt), leave standstill after stirring;

[0046] (4) Immerse the inorganic ceramic hollow fiber support body into the casting solution prepared in step (3), take it out after soaking for 40 seconds, and naturally cure it in the air for...

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Abstract

The invention relates to a preparation method for an organic and inorganic hollow fiber composite membrane. An inorganic ceramic hollow fiber serves as a support body on which one layer of organic high molecular polymer membrane is coated; the layer of the polymer membrane can be hydrophilic polymer, hydrophobic polymer or amphipathy polymer, and is mainly used for separating close-boiling or constant-boiling organic solvent in a pervaporation mode and removing tract components in the solution. The average aperture of the inorganic ceramics hollow fiber support is 0.2-0.8 microns, and the inorganic ceramics hollow fiber support has higher mechanical strength. The composite membrane is prepared on the macropore inorganic ceramics support by the bridging effect and solvent prewetting, and the problems that the organic membrane layer is easily stripped from the inorganic support with larger curvature, hole leakage is serious to cause the organic matter to excessively block the duct of the inorganic support can be solved. Compared with a micropore support of 0.02-0.2 microns, the method is more convenient, and a technical support is provided for the large-scale application of the organic and inorganic hollow fiber composite membrane.

Description

technical field [0001] The invention relates to a method for preparing an organic-inorganic hollow fiber composite membrane. The prepared membrane is mainly used for pervaporation removal of water in near-boiling or azeotropic organic solvents. Background technique [0002] Pervaporation is a membrane separation process with a wide range of applications, such as solvent dehydration and separation of organic mixtures. Traditional rectification can only recover pure solvent with the entrainer, which necessitates the addition of a separation step to remove the entrainer. Because the separation mechanism is different from rectification, pervaporation can break the azeotrope, so it has a significant advantage over the azeotropic system. Theoretically, pervaporation can separate all liquid mixtures. In practical applications, based on economic considerations, pervaporation is more suitable for the separation of near-boiling and constant-boiling mixed solutions, the removal of tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00
Inventor 金万勤吴金宜卫旺刘公平徐南平
Owner NANJING TECH UNIV
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