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Preparation method and application of molecular sieve/organic composite infiltration, vaporization and separation membrane

A technology of pervaporation and molecular sieve, which is applied in the field of membrane separation, can solve the problem of low filling area, achieve the effects of increasing the filling area, facilitating large-area preparation, and facilitating industrial scale-up

Inactive Publication Date: 2011-08-03
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of preparation method of molecular sieve / organic composite membrane in order to overcome above-mentioned deficiencies in the prior art, can prepare large-area molecular sieve / organic composite membrane with this method, and the membrane of making can be made spiral-wound type components to solve the problem of low packing area of ​​tubular inorganic molecular sieve membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Sodium silicate is used as silicon source, aluminum sulfate is used as aluminum source, in molar ratio n (Na 2 O) : n (SiO 2 ) : n (Al 2 o 3 ) : n (H 2O)=6 : 2 : 1 : 800 to prepare molecular sieve synthesis solution. Put it into the bottom of a stainless steel reactor with a polytetrafluoroethylene liner, crystallize at 80 °C for 24 h, take it out to cool, filter it with suction, wash it with deionized water until it is neutral, and dry it to obtain a nano-sized NaA molecular sieve. Using water as a solvent, NaA molecular sieves were prepared into a suspension with a mass fraction of 10% by ultrasonic oscillation. The PVA aqueous solution with a mass fraction of 10% is added to the molecular sieve suspension according to the molecular sieve suspension / PVA aqueous solution mass ratio of 5:1. A plasma-modified polytetrafluoroethylene (PTFE) organic microporous membrane was coated four times by dip coating, and dried at 60 °C for 24 h to obtain a NaA molecular sie...

Embodiment 2

[0027] Sodium silicate is used as silicon source, aluminum sulfate is used as aluminum source, in molar ratio n (Na 2 O) : n (SiO 2 ) : n (Al 2 o 3 ) : n (H 2 (O)=7.5 : 2 : 1 : 800 to prepare molecular sieve synthesis solution. Put it into the bottom of a stainless steel reactor with a polytetrafluoroethylene liner, crystallize at 80 °C for 24 h, take it out to cool, filter it with suction, wash it with deionized water until it is neutral, and dry it to obtain a nano-sized NaA molecular sieve. Water was used as a solvent, and NaA molecular sieves were prepared into a suspension with a mass fraction of 10% by ultrasonic oscillation. The PVA aqueous solution with a mass fraction of 10% is added to the molecular sieve suspension according to the molecular sieve suspension / PVA aqueous solution mass ratio of 10:1. The plasma-modified PVDF organic microporous membrane was coated three times by dip coating, and dried at room temperature for 24 h to obtain a NaA molecular sie...

Embodiment 3

[0029] molar ratio n (NaOH) : n (TEOS) : n (TPAOH) : n (H 2 O) = 0.5: 25 : 9 : 500 Prepare molecular sieve synthetic solution, stir it magnetically at room temperature, age for 40 h, put it into the bottom of a stainless steel reactor with a polytetrafluoroethylene liner, and crystallize at 100 °C After 60 h, take it out and cool it, filter it with suction, wash it with deionized water until it is neutral, and dry it to obtain a nanoscale Silicatile-I molecular sieve. Using ethanol as a solvent, the Silicatile-I molecular sieve was prepared into a suspension with a mass fraction of 10% by ultrasonic oscillation. The PVA aqueous solution with a mass fraction of 10% is added to the molecular sieve suspension according to the molecular sieve suspension / PVA aqueous solution mass ratio of 8:1. The PP organic microporous membrane was coated three times by dip coating, and dried at room temperature for 24 h to obtain a Silicatile-I molecular sieve / PP composite membrane with a me...

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Abstract

The invention belongs to the technical field of separation membranes, and relates to a preparation method and application of a molecular sieve / organic composite infiltration, vaporization and separation membrane. The preparation method comprises the following steps of: firstly adopting a hydrothermal method to prepare nano-level molecular sieve; putting the synthesized nano-level molecular sieve in a solvent, and dispersing the molecular sieve into uniform molecular sieve suspending liquid through ultrasound, wherein the mass fraction of the molecular sieve in the suspending liquid is 5-15%; uniformly coating the molecular sieve suspending liquid on an organic supporting body; drying the organic supporting body at the temperature of 20-60 DEG C to form a molecular sieve membrane; and repeating the coating for 2-4 times. Surface modification is performed on the organic supporting body by adopting methods such as plasma induction, silane coating and the like to modify the surface hydrophily. The method can be used for preparing a large-area molecular sieve / organic composite membrane; a prepared membrane can be assembled into a spirally coiled component; and the preparation method is beneficial for industrial magnification, and has a higher industrial application value. A better separation effect can be achieved when the prepared molecular sieve / organic composite membrane is used for the infiltration and vaporization of an organic water solution system.

Description

technical field [0001] The invention belongs to the field of membrane separation, and specifically relates to a method for preparing an inorganic / organic polymer composite pervaporation membrane with molecular sieve material as a separation layer and an organic polymer microfiltration membrane as a support. This type of membrane can be used in organic aqueous solutions such as: Pervaporation separation of alcohols, ethers, ketones, esters, amines, etc. Background technique [0002] Pervaporation is a membrane process that uses the difference in the dissolution (or adsorption) and diffusion properties of the components in the liquid mixture to achieve component separation. It has the advantages of high efficiency, low energy consumption, simple equipment, and small process amplification effect. , can effectively replace traditional separation methods such as distillation and extraction, and is used for the separation of near-boiling or azeotropic mixed liquids, the removal of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D71/06B01D69/10B01D67/00B01D63/10
Inventor 韶晖张环茹钟璟陈若愚夏汉忠张琪韩光鲁
Owner CHANGZHOU UNIV
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