Preparation method for gas separation composite membrane

A gas separation and composite membrane technology, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve the problems of increased mass transfer resistance of the support layer, uneven coating, etc., and achieve improved permeability and separation performance Effect

Active Publication Date: 2011-04-13
DALIAN EUROFILM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the coating is only a few microns thick, the mass transfer resistance of the support layer increases because the membrane liquid has penetrated into the pores, especially for glassy polymers, and the phenomenon of pore penetration can easily lead to the formation of defects and uneven coating

Method used

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  • Preparation method for gas separation composite membrane

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Experimental program
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Effect test

Embodiment 1

[0021] Dissolve 100 parts of vinylmethylsiloxane-octylmethylsiloxane-dimethylsiloxane copolymer (viscosity 400-800cSt) in 900 parts of isooctane, add 6 parts of polymethylhydrogensiloxane Oxane (viscosity 15-25cSt), 3 parts of 1,3-divinyl-1,1,3,3-tetramethyldisiloxane platinum complex, stirred at 40°C for 60min, prepared as a separation layer membrane liquid. The separation layer membrane solution was evenly coated on the PAN base film, dried at room temperature for 20 minutes, and heat-treated at 90°C for 30 minutes to prepare a composite membrane 1. Measure its O at 25°C 2 , N 2 , propylene (C 3 h 6 ) penetration and separation properties are: J N2 =0.224m 3 m -2 ·atm -1 h -1 , α(O 2 / N 2 )=2.316, α(C 3 h 6 / N 2 ) = 24.9.

Embodiment 2

[0023] Dissolve 70 parts of vinylmethylsiloxane-octylmethylsiloxane-dimethylsiloxane copolymer (viscosity 400-800cSt) in 930 parts of isooctane, add 4 parts of polymethylhydrogensiloxane Oxane (viscosity 15-25cSt), 3 parts of 1,3-divinyl-1,1,3,3-tetramethyldisiloxane platinum complex, stirred at 100°C for 10min, prepared as a separation layer membrane liquid. The separation layer membrane solution was evenly coated on the PAN base film, dried at room temperature for 10 minutes, and heat-treated at 120°C for 5 minutes to obtain a composite membrane 2. Measure its O at 25°C 2 , N 2 , propylene (C 3 h 6 ) penetration and separation properties are: J N2 =0.201m 3 m -2 ·atm -1 h -1 , α(O 2 / N 2 )=2.354, α(C 3 h 6 / N 2 ) = 25.7.

Embodiment 3

[0025] Dissolve 55 parts of vinylmethylsiloxane-octylmethylsiloxane-dimethylsiloxane copolymer (viscosity 400-800cSt) in 945 parts of isooctane, add 1 part of polymethylhydrogensiloxane Oxane (viscosity 15-25cSt), 2 parts of 1,3-divinyl-1,1,3,3-tetramethyldisiloxane platinum complex, stirred at 80°C for 30min, prepared as a separation layer membrane liquid. The separation layer membrane solution was evenly coated on the PAN base film, dried at room temperature for 10 minutes, and heat-treated at 80°C for 20 minutes to prepare a composite membrane 3. Measure its O at 25°C 2 , N 2 , propylene (C 3 h 6 ) penetration and separation properties are: J N2 =0.317m 3 m -2 ·atm -1 h -1 , α(O 2 / N 2 )=2.304, α(C 3 h 6 / N 2 ) = 24.3.

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Abstract

The invention discloses a preparation method for a gas separation composite membrane, comprising the following steps: dissolving a siloxane prepolymer in isooctane, adding a cross-linking agent (pelyntethylhydrosiloxane) and a catalyst (1,3-diethenyl-1,1,3,3-tetramethyldisiloxane platinum complex), stirring to prepare into separation layer membrane liquid; and evenly coating the separation layer membrane liquid on a polyacrylonitrile basement membrane, airing and performing thermal cross linking to obtain the gas separation composite membrane, wherein the adopted basement membrane is a commercialized polyacrylonitrile ultrafiltration membrane, the airing time is 2-20min, the thermal cross linking temperature is 60-120 DEG C, and the thermal cross linking time is 5-30 minutes. The permeation and separation properties of the gas separation composite membrane on O2, N2 and C2H6 determined under the temperature of 25 DEG C are respectively as follows: JN2>0.2m<3>.m<-2>.atm<-1>.h<-1>, alpha (O2/N2)>2.3, and alpha (C3H6/N2) >24. The preparation method for the composite membrane is also suitable to preparation of nanofiltration, hyperfiltration and pervaporation composite membranes.

Description

technical field [0001] The invention belongs to the technical field of semipermeable membranes for separation, and relates to a special preparation method for composite membranes, in particular to a method for compounding polymer base membranes and organic silicon separation membranes. Background technique [0002] Gas membrane separation method is a new separation technology. Compared with traditional separation methods such as cryogenic distillation and cryogenic adsorption, it has the advantages of high separation efficiency, compact equipment, small footprint, continuous operation, low energy consumption, and low investment. Advantages, are widely used in oxygen enrichment, nitrogen enrichment, hydrogen recovery, organic vapor recovery, natural gas dehumidification and other fields. [0003] At present, gas separation membranes in practical applications are mainly divided into asymmetric membranes and composite membranes. Compared with asymmetric membranes, composite mem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/70B01D69/12B01D53/22
Inventor 钮振强李恕贵王连军李恕广杜国栋栗广勇
Owner DALIAN EUROFILM IND
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