Catalytic composite membrane and preparation method thereof

CN120243123APending Publication Date: 2025-07-04NANJING TECH UNIV +1
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Patent Information

Application Number
CN202510359505.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-25
Publication Date
2025-07-04

AI Technical Summary

Technical Problem

The existing catalytic composite membranes have immature catalyst immobilization technology, limited mass transfer mechanism of the separation layer and poor synergy of the functional layer, resulting in the catalyst being easily shedded, the mass transfer efficiency is low, and the separation effect is not ideal.

Method used

The multifunctional layered heterogeneous composite structure is adopted, the support layer is polyacrylonitrile (PAN), the separation layer is a matrix of LDH-Co-MOF two-dimensional composite material and sodium alginate (SA) and the catalytic layer is 2,4-disulfonate benzaldehyde crosslinked polyvinyl alcohol (PVA). The catalyst is fixed through the aldol condensation reaction to construct a graded mass transfer channel and porous structure.

Benefits of technology

A catalytic composite membrane with high catalytic activity, good separation performance and good catalytic stability is achieved, which improves the conversion rate of the esterification reaction, significantly improves the mass transfer efficiency and catalytic efficiency, and realizes the efficient coupling between catalysis and separation.

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Abstract

The invention relates to a catalytic composite membrane and a preparation method thereof, and belongs to the technical field of chemical catalytic separation. Aiming at the problems of strong catalyst corrosivity and by-product water inhibition reaction balance in the traditional esterification process and the problems of easy catalyst falling, low mass transfer efficiency, poor functional layer synergism and the like of the existing catalytic composite membrane, the invention provides the following innovation scheme: the composite membrane adopts a three-layer heterostructure (1) polyacrylonitrile (PAN) ultrafiltration membrane as a mechanical support layer; (2) introducing a sodium alginate (SA) matrix into the layered double hydroxide (LDH)-Co-MOF two-dimensional composite material to prepare a composite separation layer, constructing a graded mass transfer channel, and realizing high-selectivity water permeation; and (3) preparing a 2, 4-sodium disulfonate benzaldehyde-PVA porous catalyst layer, and covalently anchoring a sulfonic acid-based catalyst by using aldol condensation reaction to expose high-density active sites. The method has the advantages that the aldol condensation C-C bond fixing technology enables the catalyst to be long-acting and stable; the porous structure of the catalyst layer greatly increases catalytic active sites, so that the catalytic reaction and separation mass transfer are synergistically enhanced; according to the invention, integration of catalysis and separation is realized, esterification reaction and separation processes are effectively coupled, damage of moisture in a catalyst layer to a separation layer is reduced, and meanwhile, the conversion rate of acetic acid is remarkably improved. The method realizes efficient coupling of catalysis and separation, has the characteristics of high conversion rate, long-period stability and environmental protection, and is suitable for the fields of ester synthesis and chemical separation.
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Citation Information

Patent Citations

  • Polyvinyl alcohol catalytic composite membrane and preparation method thereof

    CN109092086A

  • Sulfonated polyvinyl alcohol catalytic composite film and preparation method thereof

    CN110354698A

Cited By

  • PVA catalytic composite membrane with asymmetric structure and preparation method thereof

    CN122499650A