Hollow fiber compound film with ultra-thin active layer, preparation method and application thereof

A fiber composite and active layer technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of difficult ultra-thin active skin layer, complicated method process, complex realization process, etc., to achieve membrane production The effect of low cost, simple preparation process and abundant sources

Inactive Publication Date: 2008-09-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the process of this patent method is complex and difficult to control
Chinese Patent (Application No. 98114022.X) discloses "Preparation and Application of a Composite Gas Separation Membrane", which adopts a polyacrylonitrile microporous support layer and uses polydimethylsiloxane as an active separation layer. It is difficult to achieve ultra-thin active cortex
In Chinese patent 02113599, polysulfone or polyimide microporous support layer is covered with polyvinyl alcohol or polydimethylsiloxane by interfacial polymerization method. The thickness of the active separation layer is 1.5-4 microns, and the realization process is relatively complicated.

Method used

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  • Hollow fiber compound film with ultra-thin active layer, preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0013] Soak a polysulfone hollow fiber membrane with a molecular weight cut off of 6000, an outer diameter of 340 μm, and an inner diameter of 130 μm in deionized water for 24 hours, then soak it in 0.5mol / L hydrochloric acid solution for 0.5 hour, take it out and dry it for later use; use 0.5mol / L The hydrochloric acid modulation pH value is 9.4, and concentration is the 500mlTris-HCl buffer solution of 0.1mol / L; Then add dopamine hydrochloride to make 2mg / ml solution; Soak the polysulfone hollow fiber support layer in the solution for 1 hour to obtain polydopamine / Polysulfone hollow fiber composite membrane (membrane 1).

[0014] The thickness of the polydopamine separation layer of the prepared membrane 1 was measured to be 16 nm by a profilometer. It is used to separate propylene-water mixed gas with a water mass concentration of 0.3wt%, the permeability coefficient of water can reach 11608GPU, and the separation factor of water to propylene is infinite.

Embodiment 2

[0016] Soak a polysulfone hollow fiber membrane with a molecular weight cut off of 6000, an outer diameter of 340 μm, and an inner diameter of 130 μm in deionized water for 24 hours, then soak it in 0.5mol / L hydrochloric acid solution for 0.5 hour, take it out and dry it for later use; use 0.5mol / L The hydrochloric acid modulation pH value is 7.8, and concentration is the 500mlTris-HCl damping fluid of 0.1mol / L; Add dopamine hydrochloride to make 2mg / ml solution then; Soak the polysulfone hollow fiber supporting layer in the solution for 5 hours, obtain polydopamine / Polysulfone hollow fiber composite membrane (membrane 2).

[0017] The thickness of the polydopamine separation layer of the prepared membrane 1 was measured to be 45 nm by a profilometer. It is used to separate propylene-water mixed gas with a water mass concentration of 0.3wt%, the permeability coefficient of water can reach 811GPU, and the separation factor of water to propylene is infinite.

Embodiment 3

[0019] Soak a polysulfone hollow fiber membrane with a molecular weight cut off of 6000, an outer diameter of 340 μm, and an inner diameter of 130 μm in deionized water for 24 hours, then soak it in 0.5mol / L hydrochloric acid solution for 0.5 hour, take it out and dry it for later use; use 0.5mol / L The hydrochloric acid modulation pH value is 8.8, and concentration is the 500mlTris-HCl damping solution of 0.1mol / L; Then add dopamine hydrochloride and make 1mg / ml solution; Soak the polysulfone hollow fiber support layer in the solution for 24 hours, obtain polydopamine / Polysulfone hollow fiber composite membrane (membrane 3).

[0020] The thickness of the polydopamine separation layer of the prepared membrane 1 was measured to be 60 nm by a profilometer. Used to separate propylene-water mixture gas with a water mass concentration of 0.3wt%, the permeability coefficient of water can reach 739.4GPU, and the separation factor of water to propylene is 215,000.

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Abstract

The invention discloses a hollow fiber composite membrane of an ultrathin active layer. the preparation method and the application thereof, belonging to the technique of hollow fiber composite membrane. The supporting layer of the composite membrane is polysulfone hollow fiber membrane, the active layer is poly-dopamine, the thickness is 15 to 90 nm. The preparation process includes: pretreatment is performed for the polysulfone hollow fiber membrane; hydrochloric acid dopamine with certain mass is added into Tris-HCI buffer solution with certain concentration and certain pH value, and then the supporting layer of the polysulfone hollow fiber is immersed into the solution to obtain the poly-dopamine/polysulfone hollow fiber composite membrane. The hollow fiber composite membrane is used for gas dehumidification, is in particular suitable for dehydration of propylene gases. The hollow fiber composite membrane, the preparation method and the application thereof have the advantages that the ultra-thin, flawless active layer with adjustable thickness can be prepared on the supporting layer, the preparation process is simple with excellent dehumidification performance; the raw materials are abundant, the price is reasonable and the production cost of the membrane is low.

Description

technical field [0001] The invention relates to a hollow fiber composite membrane with an ultra-thin active layer, a preparation method and application thereof, and belongs to the hollow fiber composite membrane technology. Background technique [0002] Membrane separation technology is a new type of separation technology that utilizes the difference in the selective permeability of the membrane to the components of the mixture to achieve separation, purification or enrichment. In order to improve the permeability of the membrane in industrial production, the material with separation effect (dense skin layer) is usually covered on the porous support layer to form a composite membrane. For composite membranes, different membrane materials can be preferred to prepare a dense skin layer and a porous support layer, so that each layer can exert its maximum effect independently. The separation of the composite membrane is mainly or completely determined by the dense skin layer, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/08C07C7/144C07C11/06
Inventor 姜忠义潘福生贾会平
Owner TIANJIN UNIV
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