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Chitosan/ synthetic hydrotalcite composite permeable membrane, preparation method and application thereof

A technology of hydrotalcite and chitosan, which is applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of unsatisfactory desulfurization effect and low removal effect of thiophene organic sulfur-containing compounds, etc. Mechanical strength, large specific surface area, the effect of prolonging the life cycle

Active Publication Date: 2010-12-29
临沂星火知识产权服务有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to overcome the unsatisfactory desulfurization effect of the existing osmotic membrane, especially the shortcoming that the desulfurization effect of thiophene organic sulfur compounds is not high, the inventor has developed a kind of compound chitosan composed of highly hydrophilic biomacromolecular polysaccharides. Composite film with synthetic layered hydrotalcite-like structure

Method used

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  • Chitosan/ synthetic hydrotalcite composite permeable membrane, preparation method and application thereof
  • Chitosan/ synthetic hydrotalcite composite permeable membrane, preparation method and application thereof
  • Chitosan/ synthetic hydrotalcite composite permeable membrane, preparation method and application thereof

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Embodiment 1

[0060] Embodiment 1. hydrotalcite-like preparation

[0061] MgCl 2 ·6H 2 O, AlCl 3 ·6H 2 O and FeCl 3 ·6H 2 O was formulated into a mixed solution at a molar ratio of 0.8:3:1, and coprecipitant ammonia water was added under continuous stirring to adjust the pH value of the solution to 9.8, and coprecipitation was formed. Aging for 1.5 hours, filtering and washing; sealing the filter cake in a glass container, keeping the temperature between 72-80°C and peptizing for 12 hours to obtain Fe 0.87 Mg 2.60 (Al(OH) 10.2 Cl 0.6 ) layered hydrofossil compounds. The particle size measurement shows that the average particle size is 201.9nm, the average thickness of layered crystals is 35nm, the interlayer distance is 0.76nm, the interlayer channel height is 0.50nm, and the specific surface area is 1820m 2 / g, zero charge point 10.35, isoelectric point 11.23. X-ray analysis proves that it has a hydrotalcite-like crystal structure: its characteristic diffraction angles 2θ are 10...

Embodiment 2

[0063] Hydrotalcite-like preparation

[0064] MgCl 2 ·6H 2 O, AlCl 3 ·6H 2 O and FeCl 3 ·6H 2 O is formulated into a mixed solution at a molar ratio of 0.6: 1: 3, and the coprecipitant ammonia water is added under constant stirring to adjust the pH value of the solution to 10, coprecipitation is generated, aged for 1.5 hours, filtered and washed; the filter cake is sealed in In a glass container, keep the temperature between 72-80°C and peptize for 12 hours to obtain Fe 0.62 Mg 2.70 (Al(OH) 10.3 Cl 0.7 ) layered hydrofossil compounds. Particle size analysis shows that the average particle size is 121nm, the average thickness of layered crystals is 40nm, the interlayer distance is 0.8nm, the interlayer channel height is 0.7nm, and the specific surface area is 1520m 2 / g, zero charge point 11.25, isoelectric point 12.1. X-ray analysis demonstrated a hydrotalcite-like crystal structure: the positions of the peaks did not change.

Embodiment 3

[0065] Embodiment 3. Composite permeable membrane preparation

[0066] It is 75% that the degree of deacetylation of 2g, the chitosan that molecular weight is 15000 are dissolved in the 3wt% acetic acid aqueous solution of 100ml, add the hydrotalcite-like fine powder that 80g embodiment 1 synthesizes under constant stirring and stir 2 hours; Add 0.8ml of 25wt% succinaldehyde solution to make the chitosan undergo cross-linking reaction to obtain a synthetic hydrotalcite-like suspension that absorbs the cross-linked chitosan film.

[0067] A 15% cellulose acetate solution was coated on the surface of a glass plate and dried at 100°C to obtain a 25 μm support film. Then the prepared chitosan / synthetic hydrotalcite suspension was spin-coated (i.e., spin-coated) on a cellulose acetate support film, and dried at 60°C to obtain a total film thickness of 55 μm, and then obtained from a glass substrate Peeling off on the surface is the product of the pervaporation separation membrane ...

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Abstract

The invention relates to a chitosan / synthetic hydrotalcite composite membrane which can be taken as a component for separating a penetration-evaporation film. The composite membrane comprises four components including chitosan, synthetic hydrotalcite, butanedial and synthetic cellulose, wherein the dosage parts of each component are: 2-10 parts of chitosan, 70-80 parts of synthetic hydrotalcite,0.2-0.9 part of butanedial and 17.8-19.1 parts of synthetic cellulose. The composite membrane is mainly taken as a permeable evaporation separating film module, and is used for removing organic sulfur-containing compound in oil products such as gasoline, diesel oil and the like. A single-stage film module way is adopted for sulfur removal, the product oil has the sulfur content of 90-110ppm and the sulfur removal rate of 93-96%; and a three-stage film module way is adopted for sulfur removal, the product oil has the sulfur content which is less than 15ppm.

Description

Technical field: [0001] The technology belongs to the field of permeable membrane products, specifically a chitosan / synthetic hydrotalcite composite membrane, a preparation method thereof and an application in gasoline desulfurization. Background technique: [0002] At present, membrane separation technology is used to remove sulfur-containing compounds in oil products, especially the method of removing thiophene organic sulfur-containing compounds mainly adopts permeation-extraction and permeation-evaporation technology. [0003] "Membrane Science and Technology" discloses that Chen Cuixian of Tsinghua University and others used PDMS membrane permeation-evaporation to remove thiophene sulfur contained in n-octane, an analog component of gasoline. [0004] "Membrane Science and Technology" disclosed that Li Jiding and others used polydimethylsiloxane (PDMS) / polyacrylonitrile (PAN) composite membrane as a permeation-evaporation membrane to remove aromatic sulfur compounds thi...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01J20/30
Inventor 车春玲冯绪胜
Owner 临沂星火知识产权服务有限公司
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