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PDMS/PVDF complex film for separating organic steam and preparation method thereof

An organic vapor, composite membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of reducing the separation factor of the separation system, difficult to prepare the skin layer, low permeation flux, etc. Simple, well-distributed, defect-free bonding effect

Inactive Publication Date: 2008-07-30
中膜科技(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Symmetric membranes have the same density throughout the membrane thickness and are thicker, so the permeate flux of the membrane is lower
Asymmetric membranes have a thinner dense skin and a porous support layer. Compared with symmetrical membranes, the permeation flux of the membrane is increased by reducing the thickness of the separation layer, but it is difficult to prepare defect-free Cortex, thus reducing the separation factor of the separation system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve 15 parts by mass of polyvinylidene fluoride completely in N,N-dimethylacetamide, and mechanically stir at 70°C for 24 hours to obtain a clear and transparent casting solution. After filtering and degassing under reduced pressure, use The film solution was scraped onto the polyester non-woven fabric with a scraper, the thickness of the scraper was 150 μm, and the polyvinylidene fluoride porous bottom film was made after gelling in water at 20°C. The γ-aminopropyltrimethoxysilane surfactant solution is prepared according to the concentration of 20% volume ratio, and the PVDF base film is soaked in the solution for 10-60 minutes, dried at 50° C. for later use. Dimethyl silicone rubber is dissolved in n-heptane solvent according to the mass ratio of 30 parts by mass, and after mixing evenly, a crosslinking agent ethyl tetrasilicate is added, and the mass percentage is 8% of the total weight of the dimethyl silicone rubber solution; Then add dibutyltin dilaurate as ...

Embodiment 2

[0030] Completely dissolve polyvinylidene fluoride (20 parts by mass) in triethyl phosphate or vinylpyrrolidone, and mechanically stir at 70°C for 24 hours to obtain clear and transparent casting solutions, which are filtered and degassed under reduced pressure Finally, the two membrane solutions were scraped onto the polyester non-woven fabric with a scraper, the thickness of the scraper was 150 μm, and the polyvinylidene fluoride porous bottom membrane was made after gelling in water at 20°C. The γ-aminopropyltrimethoxysilane-ethanol surfactant solution is prepared according to the concentration of 30% volume ratio, and the PVDF base film is soaked in the solution for 10-60min, and dried at 50°C for later use. Dissolve dimethyl silicone rubber in n-hexane solvent at a mass ratio of 30%, add crosslinking agent vinyltrimethoxysilane after mixing evenly, and the mass percentage is 8% of the total weight of the dimethyl silicone rubber solution; then add Dibutyltin dilaurate is ...

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Abstract

The invention discloses a PDMS / PVDF composite membrane for separating organic vapor which pertains to the technical field of vapor permeation membrane separation and a preparation method thereof. The steps to prepare the composite membrane are that: polyvinylidene fluoride is firstly dissolved in a solvent to prepare a basement membrane and the basement membrane is dried, treated by a surfactant and reserved. Silicone rubber is dissolved in normal heptane to be prepared into a uniform membrane casting solution; then the filtered and defoamed membrane casting solution is coated on the treated basement membrane and PDMS / PVDF composite membrane is obtained after being cured at different temperatures. The PDMS separation layer prepared by the invention is uniformly distributed, compact and sound, and is closely combined with the PVDF. The obtained PDMS / PVDF composite membrane by preparation is applied to separating dimethylmethane / N2 system, the total flux reaches 615*10<6>cm<3>(STP) / (cm<2>s cmHg) and the separation factor is larger than 20.

Description

technical field [0001] The invention belongs to the technical field of steam permeation membrane separation. In particular, it relates to a PDMS / PVDF composite membrane for separating organic vapor and a preparation method thereof. Background technique [0002] During the storage and transportation of petrochemical, organic synthesis, and oil and gas, a large amount of organic matter is often discharged into the air, which not only causes waste of organic matter, but also causes environmental pollution. As environmental protection and energy conservation become more and more important, the recovery of organic vapor becomes necessary in terms of environmental protection and resource recovery. [0003] The traditional methods for recovering organic vapor include activated carbon adsorption, compression-condensation, and deep condensation. The adsorption method is the earliest organic vapor separation method, which uses activated carbon to adsorb and purify the exhaust gas, a...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/34B01D71/70
Inventor 李继定操建华林阳政
Owner 中膜科技(苏州)有限公司
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