Process for preparing silicon separating films with specialized selectivity to natural products

Abstract

Disclosed is a preparation method of silicon separation membrane, having specific selectivity to natural products, which belongs to a membrane preparation technique. The method comprises: dissolving a template agent into an alcohol solution to produce template agent solution, then, adding functional monomers into said produced solution, adding in stabilizer, condensing and refluxing to remove the solvent and produce a silane precursor, dissolving tetraethoxysilane into the alcohol solution, adding in the silane precursor followed by condensing and refluxing to prepare a sol, next, aging at room temperature and dipping treated Al2O3 plate into the sol, finally, sintering in a muffle, eluting the template agent and drying to produce silicon separation membrane. The present invention is characterized in simple preparation, the produced separation membrane realizing selectively separation of a certain substance in molecular scale, water-phase molecule recognition, particularly fit for natural products separation and extensive general uses.

Description

Technical field [0001] The invention relates to a method for preparing a siliceous separation membrane with specific selectivity for natural products. It belongs to the preparation technology of separation membrane. Background technique [0002] Membrane separation technology is one of the unit operations with the most development potential in the 21st century and has broad application prospects. Membrane separation technology has many advantages, such as no phase change in the separation process, low energy consumption; large separation coefficient, continuous operation, high efficiency, no secondary pollution; low operating temperature, suitable for heat-sensitive substances (juices, enzymes, medicines) Separation, purification and enrichment; simple equipment, easy to operate, etc., but there are still many problems in practical applications, such as serious membrane pollution and degradation; most organic membrane materials, especially hydrophil...

AI Technical Summary

Problems solved by technology

Membrane separation technology has many advantages, such as no phase change in the separation process, low energy consumption; large separation coefficient, continuous operation, high efficiency, and no secondary pollution; low operating temperature, suitable for heat-sensitive substances (juice, enzymes, medicines) separation, purification and enrichment; the device is simple, easy to operate, etc., but there are still many problems in practical applications, such as serious membrane fouling and degradation; most organic membrane materials, especially hydrophilic materials, have poor thermal stability, Low mechanical strength, poor resistance to chemicals, etc.; at present, the selectivity of membrane technology separation is achieved by molecular weight cut-off, but natural products, drugs or some chemical products have relatively close molecular weights, and it is difficult to use existing membrane technology to accurately Separation, so improving the selectivity of the membrane and making the membrane separation achieve accurate separation is one of the difficult problems faced by the current membrane technology.

Molecular imprinting is a technology developed in the past 20 years to prepare highly selective adsorption materials. It imitates the principle of keys and locks in the biological world. It can selectively separate the components to be separated from the molecular level. However, the molecular imprinting technology used Most of the functional monomers and cross-linking agents are organic compounds, and the molecular imprinting and molecular recognition processes cannot be realized in polar solvents, while many natural products, drugs or some chemical products are water-soluble substances, which exist in the application. with difficulty