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

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...

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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.

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