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Preparation method of gas separation composite film

A gas separation and composite membrane technology, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as uneven coating, increased mass transfer resistance of transition layer, etc., and achieve permeability and separation performance Improvement, simplification of equipment process and cost, and the effect of saving pre-wetting steps

Active Publication Date: 2012-10-10
DALIAN EUROFILM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the coating is only a few microns thick, the R 1 Controllable, but because the membrane liquid has penetrated into the pores, the mass transfer resistance R of the transition layer 2 increase, and the phenomenon of porosity can easily lead to the formation of defects and uneven coating

Method used

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  • Preparation method of gas separation composite film

Examples

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Embodiment 1

[0025] Use 140 parts of polyacrylonitrile with a viscosity average molecular weight of 135000, add 860 parts of DMF, and prepare a solution with a PAN concentration of 14%wt, add 60 parts of LiCl, mix well, and cast on polyester non-woven fabric. The thickness is 250 μm, and the PAN base film is made by gelling in an aqueous solution with a LiCl concentration of 12% wt. Dissolve 70 parts of siloxane prepolymer in 930 parts of isooctane, add 3 parts of cross-linking agent, 2 parts of catalyst, stir at 20°C for 60 minutes, and prepare the separation layer membrane liquid. The separation layer membrane solution was uniformly coated on the PAN base film, dried at room temperature for 15 minutes, heat-treated at 90°C for 30 minutes, soaked in deionized water for 24 hours, and dried to obtain composite membrane 1. The resulting composite membrane was measured at 25 °C for its O 2 , N 2 , propylene (C 3 h 6 ) penetration and separation properties are: J N2 =0.342m 3 m -2 ·atm ...

Embodiment 2

[0029] Using 160 parts of polyacrylonitrile with a viscosity-average molecular weight of 135,000, adding 840 parts of DMF to prepare a solution with a PAN concentration of 16% wt, adding 50 parts of CaCl 2 , after mixing evenly, it was cast on polyester non-woven fabric with a cast thickness of 250 μm, in CaCl 2 Concentration of 10%wt aqueous gel to make PAN base film. Dissolve 80 parts of polyoctylmethylsiloxane prepolymer in 920 parts of isooctane, add 4 parts of cross-linking agent, 3 parts of catalyst, stir at 40°C for 10 minutes, and prepare the separation layer membrane liquid. The separation layer membrane solution was evenly coated on the PAN base film, dried at room temperature for 10 minutes, heat-treated at 120°C for 10 minutes, soaked in deionized water for 24 hours, and dried to obtain composite membrane 3. The resulting composite membrane was measured at 25 °C for its O 2 , N 2 , propylene (C 3 h 6 ) penetration and separation properties are: J N2 =0.315m ...

Embodiment 3

[0031] Adopting 160 parts of polyacrylonitrile with a viscosity-average molecular weight of 135000, adding 840 parts of DMF, it is prepared into a solution with a PAN concentration of 10% wt, adding 80 parts of Al(NO 3 ) 3 , after mixing evenly, it was cast on polyester non-woven fabric with a casting thickness of 200 μm, in Al(NO 3 ) 3 Concentration of 10%wt aqueous gel to make PAN base film. Dissolve 60 parts of polyoctylmethylsiloxane prepolymer in 940 parts of isooctane, add 2 parts of cross-linking agent and 2 parts of catalyst, stir at 80°C for 5 minutes, and prepare the separation layer membrane liquid. The separation layer membrane solution was uniformly coated on the PAN base film, dried at room temperature for 8 minutes, heat treated at 80°C for 20 minutes, soaked in deionized water for 24 hours, and dried to obtain composite membrane 4. The resulting composite membrane was measured at 25 °C for its O 2 , N 2 , propylene (C 3 h 6 ) penetration and separation p...

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Abstract

The invention discloses a preparation method of a gas separation composite film. The method comprises the following steps of: dissolving polyacrylonitrile (PAN) in dimethyl formamide (DMF) so as to obtain 10 to 18 weight percent of solution, adding additives (chlorides of lithium, calcium and the like), filtering, defoaming, performing curtain coating on a polyester non-woven fabric, volatilizinga solvent and gelling in gelling bath (10 to 15 percent of aqueous solution serving as an additive) so as to obtain a base film; dissolving a siloxane prepolymer in isooctane and adding a cross-linking agent (polymethyl hydrogen siloxane) and a catalyst (1,3-divinyl-1,1,3,3-tetramethyldisiloxane platinum complex) so as to obtain separation layer film liquid; and uniformly coating the separation layer film liquid on a PAN base film, drying in the air, performing thermal treatment and soaking in deionized water. The permeation and separation performance of the film on O2 / N2 are that: JN2 is more than 0.3m<3>.m<-2>.atm<-1>; alpha (O2 / N2) is more than 2.3; and alpha (C3H6 / N2) is more than 24. The preparation method is suitable for nanofiltration, reverse osmosis and preparation of a pervaporation composite film.

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 Patents(China)
IPC IPC(8): B01D69/12B01D69/10B01D71/70B01D53/22
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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