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Pervaporation hybridigation composite film as well as preparation method and application thereof

A hybrid composite and pervaporation technology, applied in the field of membrane separation, can solve the problem of low filling area, and achieve the effect of increasing the filling area, simple membrane production process and rapid membrane formation.

Inactive Publication Date: 2012-03-21
BEIJING CLP JIAMEI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the limitations of the above-mentioned background technology, the present invention proposes a pervaporation membrane material with high mechanical strength and good physical and chemical stability, and at the same time proposes a preparation method of the pervaporation membrane, which has the advantages of simple process, rapid film formation, and easy large-scale The advantages of area preparation; the prepared hybrid composite membrane can be used for the separation of mixtures of organic matter and water, which is convenient for making tubular or spiral wound membrane modules, and solves the problem of low filling area

Method used

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  • Pervaporation hybridigation composite film as well as preparation method and application thereof
  • Pervaporation hybridigation composite film as well as preparation method and application thereof
  • Pervaporation hybridigation composite film as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Take Na 2 SiO 3 9H 2 O is the silicon source, Al 2 SO 3 18H 2 O is the source of aluminum, NaOH is the source of alkali, in molar ratio n(Na 2 O):n(SiO 2 ):n(Al 2 o 3 ):n(H 2 O)=6:2:1:750 to prepare molecular sieve synthesis solution. Crystallize in a polytetrafluoroethylene-lined stainless steel reactor at 85°C for 20 hours, take it out for quenching, filter with suction, wash with deionized water until neutral, and dry to obtain nano-sized NaA molecular sieves. XRD pattern of NaA molecular sieve and PTFE support layer figure 1 (a) and figure 1 (b) shown.

[0036] Add 20 g of 40% NaA molecular sieve aqueous solution into 20 g of 40% PVA aqueous solution, add 16 g of deionized water, and ultrasonically vibrate for 15 minutes to obtain a casting solution with a NaA:PVA:solvent ratio of 1:1:5 . α-Al 2 o 3 Coating film on the support layer, drying at 30°C for 12 hours, repeating the film coating 3 times to get NaA / PVA / α-Al 2 o 3 Composite film. The XRD p...

Embodiment 2

[0038] Take Na 2 SiO 3 9H 2 O is the silicon source, Al 2 SO 3 18H 2 O is the source of aluminum, NaOH is the source of alkali, in molar ratio n(Na 2 O):n(SiO 2 ):n(Al 2 o 3 ):n(H 2 O)=7:2:1:800 to prepare molecular sieve synthesis solution. Crystallize in a polytetrafluoroethylene-lined stainless steel reactor at 80°C for 24 hours, take it out for quenching, filter with suction, wash with deionized water until neutral, and dry to obtain nano-sized NaA molecular sieves.

[0039] 10g mass fraction of 40% NaA molecular sieve suspension (ethanol as solvent) was added into 30g mass fraction of 40% PVA aqueous solution, then 12g of absolute ethanol was added, and ultrasonic vibration was performed for 15min to obtain NaA: PVA: the solvent ratio was 1: 3:6 casting solution; wherein, the mass ratio of water:ethanol in the solvent is 1:1. The PTFE film was coated twice by the dip coating method, and dried at 25°C for 12 hours to obtain a NaA / PVA / PTFE composite film. Membra...

Embodiment 3

[0041] Take Na 2 SiO 3 9H 2 O is the silicon source, Al 2 SO 3 18H 2 O is the source of aluminum, NaOH is the source of alkali, in molar ratio n(Na 2 O):n(SiO 2 ):n(Al 2 o 3 ):n(H 2 O)=7:2:1:800 to prepare molecular sieve synthesis solution. Crystallize in a polytetrafluoroethylene-lined stainless steel reactor at 80°C for 24 hours, take it out for quenching, filter with suction, wash with deionized water until neutral, and dry to obtain nano-sized NaA molecular sieves.

[0042] 30g mass fraction of 40% NaA molecular sieve suspension (ethanol as solvent) was added into 15g mass fraction of 40% PVA aqueous solution, then 9g of absolute ethanol was added, and ultrasonic vibration was performed for 15min to obtain NaA:PVA:solvent ratio of 1: 0.5:3 casting solution; wherein, the mass ratio of water:ethanol in the solvent is 1:3. The PTFE film was coated three times by dip coating, and dried at 25°C for 12 hours to obtain a NaA / PVA / PTFE composite film. Membrane area is ...

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Abstract

The invention provides a pervaporation hybridigation composite film, which consists of a separation layer and a support layer, wherein the separation layer is a mixture of hydrophilic NaA (naphthaleneacetic acid) and PVA (polyvinyl acetate). The pervaporation hybridigation composite film has the advantages that the separation performance is good, in addition, the mechanical intensity is high, the materialization stability is good, the preparation process is simple, the large-area preparation is easy, the further amplification is favorably realized, and the industrial production is finally realized. The invention also provides a preparation method of the composite film and application to the separation of mixtures of organic matter and water.

Description

technical field [0001] The invention relates to a pervaporation hybrid composite membrane, a preparation method and application thereof, and belongs to the field of membrane separation. Background technique [0002] Pervaporation is a process in which the partial pressure difference of the components in the liquid mixture is driven by the difference in vapor partial pressure, and the separation is achieved by the different dissolution and diffusion speeds of the components through the dense membrane. The pervaporation separation process is not limited by thermodynamic equilibrium, and is especially suitable for the separation of near-boiling or azeotropic substances, heat-sensitive substances and isomers that are difficult or impossible to separate by ordinary rectification. The process of pervaporation membrane separation technology is simple, the device occupies a small area, the structure is compact, the operation is convenient, the resource utilization rate is high, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D61/36
Inventor 张环茹
Owner BEIJING CLP JIAMEI ENVIRONMENTAL PROTECTION TECH
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