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A thin film composite membrane containing an intermediate layer and its preparation method and application

An intermediate layer and composite membrane technology, applied in the field of membrane separation, can solve the problem of low separation factor, and achieve the effect of improving the separation factor, avoiding the membrane-making process, and improving the separation performance.

Active Publication Date: 2022-03-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above defects of the prior art, the present invention provides a modification method of polyamide thin film composite membrane, which overcomes the technical problem of low separation factor of pervaporation ethanol dehydration caused by insufficient density. The method of phytic acid and metal complex intermediate layer, and then further interfacial polymerization to prepare polyamide selective layer

Method used

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  • A thin film composite membrane containing an intermediate layer and its preparation method and application
  • A thin film composite membrane containing an intermediate layer and its preparation method and application
  • A thin film composite membrane containing an intermediate layer and its preparation method and application

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Embodiment 1

[0033] (1) Prepare a NaOH aqueous solution with a concentration of 2M, heat it to 50° C., use polyacrylonitrile as a support layer, soak the support layer in NaOH aqueous solution for alkali treatment.

[0034] (2) Prepare 0.01M phytic acid aqueous solution and iron ion aqueous solution, configure 2% diethylenetriamine (DETA) aqueous solution, 0.1wt% trimesoyl chloride n-hexane solution, and stir thoroughly after ultrasonication for 30 minutes at room temperature To dissolve it completely, first soak the alkali-treated support layer in the iron ion solution for two minutes, take it out and soak it in the phytic acid aqueous solution for two minutes, wash it in water for one minute after taking it out, and then dry it in the air for ten minutes to obtain a layer complex middle layer.

[0035] (3) Soak the intermediate layer of the complex obtained in step (2) into the DETA solution for 5 minutes and take it out. After removing excess water on the surface, place it in the air fo...

Embodiment 2

[0037] The main difference between embodiment 2 and embodiment 1 is that in step (2), the process of soaking the phytic acid aqueous solution after soaking the iron ion solution is repeated again to obtain a two-layer complex intermediate layer.

Embodiment 3

[0039]The main difference between embodiment 2 and embodiment 1 is that in step (3), the process of soaking the phytic acid aqueous solution after soaking the ferric ion solution is repeated twice to obtain the middle layer of the three-layer complex.

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Abstract

The invention belongs to the field of membrane separation, and in particular relates to a thin film composite membrane containing an intermediate layer, a preparation method and application thereof. In the preparation method of the present invention, metal ions and organic phosphoric acid are complexed on the surface of the support layer to prepare several layers of complex intermediate layers, and then the polymer selective layer is formed after in-situ polymerization and curing on the surface of the complex intermediate layer, so that the thin film can be obtained Composite film. The invention selects the material with complexing effect as the middle layer, and prepares the hollow fiber membrane composite membrane containing the middle layer. The introduction of the intermediate layer through a simple soaking method improves the dehydration performance of the organic solvent (ethanol) in the polyamide hollow fiber membrane composite membrane, avoids the cumbersome membrane making process, and simplifies the preparation process. Compared with the polyamide without the intermediate layer Thin film composite membrane, the separation factor of the polyamide thin film composite membrane containing the middle layer has been greatly improved.

Description

technical field [0001] The invention belongs to the field of membrane separation, and in particular relates to a thin film composite membrane containing an intermediate layer, a preparation method and application thereof. Background technique [0002] Membrane separation technology has been widely used in many fields of daily life, environmental protection, and industrial production, and has become one of the most important means in today's separation science. The polyamide composite membrane (Thin-filmcomposite, referred to as TFC) membrane prepared by interfacial polymerization not only has simple preparation process and low cost, but also because of its ultra-thin film thickness, it is especially suitable for hollow fiber TFC with larger specific surface area. In terms of membranes, the higher permeation flux is also a unique advantage of TFC membranes compared to other types of membranes. However, TFC membranes also have their inherent problems. For example, the polyami...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D69/08B01D69/02B01D67/00B01D71/56
CPCB01D69/125B01D69/08B01D69/02B01D67/0079B01D71/56
Inventor 王艳刘书铜
Owner HUAZHONG UNIV OF SCI & TECH