Preparation method for nanoscale dispersive high-performance organic/inorganic hybrid membrane

Abstract

The invention discloses a preparation method for a nanoscale dispersive high-performance organic / inorganic hybrid membrane and belongs to the technical field of membrane separation. The method comprises the steps that liquid-state low polymers are selected as membrane liquid A, and quantitative hydrophobic inorganic nano-particles are evenly dispersed in a curing agent solution to form suspension liquid B; a pretreated porous base membrane is fixed to a membrane carrying table and rotates at a constant speed; the membrane liquid A and the suspension liquid B are sprayed on the surface of the porous base membrane in an atomized mode; at a certain temperature, the liquid-state low polymers are subjected to a quick cross-linking reaction on the surface of the porous base membrane, and the nanoscale dispersive high-performance organic / inorganic hybrid membrane is obtained. Through the method, agglomeration of the inorganic nano-particles in the process that the low polymers react to form the membrane can be effectively avoided, the nano-particles are dispersed at the nanoscale in a separation layer, and the organic / inorganic hybrid membrane with high dispersity and high performance can be prepared within an extremely short period of time; moreover, in the whole membrane preparation process, the process is environmentally friendly, operation is simple, and large-scale preparation is easy.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a method for preparing a nanoscale dispersed high-performance organic / inorganic hybrid membrane. Background technique [0002] With the increasingly severe environmental pollution and the increasing scarcity of fossil energy, bioalcohol (bio-ethanol, bio-butanol), as a clean and renewable new energy source, has been highly valued by countries all over the world. However, due to product inhibition, the traditional fermentation process only obtains dilute ethanol and butanol solutions with extremely low concentrations, which requires further separation and concentration. Pervaporation-preferential alcohol-permeable membrane technology has the advantages of high efficiency, energy saving, environmental protection, etc., and has no toxic effect on microorganisms. Therefore, coupling it with the fermentation process can remove ethanol and butanol in the ferment...

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Problems solved by technology

However, the inventors have found that these inventive devices all use commonly used pressure barrels to circulate the feed liquid, and the pressure barrels can only be used for the delivery of very dilute solutions. In these published patents, the preparation of the separation membranes uses high viscosity or Solid polymers require a large amount of solvent to be dissolved, and the separation membrane can only be sprayed and atomized after forming a very dilute membrane liquid, and post-treatments such as solvent volatilization and cross-linking are required. Therefore, it takes a long time to form a separation membrane (several hours), the film-forming efficiency is low; subsequently, Zhang Guojun et al. (CN201310654128) disclosed a kind of preparation device and method of environment-friendly preferential alcohol-permeable composite film again, in this method, although using liquid oligomer film-forming can Reduce the environmental pollution of organic solvents, but this preparation device and method can only separate the film-forming process of the polymer from the post-crosslinking process, and the post-crosslinking time takes 6-20 hours to completely form the film. Therefore, the film-making efficiency is still a problem. Difficult problem; Zhang Guojun et al. (CN105169959A) disclosed a method for fast and environmentally friendly preparation of dense separation membranes, which can directly use liquid oligomers in the preparation of dense separation membranes in a short period of time, greatly shortening the film-forming process And reduce environmental pollution, but the main purpose of the disclosed film-forming method is only to improve the film-forming efficiency of the separation membrane and the environmental protection of the film-forming process, but the performance of the prepared separation membrane is poor, and the practical application of the membrane is greatly restricted

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