Method for producing inorganic film central layer

Abstract

The present invention discloses a method for preparing for inorganic membrane interface layer and belongs to the technical field of chemical engineering. The present invention is characterized by developing a heat coating method, carrying out two separated traditional processes of coating and drying instantly and synchronously and overcoming the disadvantages that the traditional coating method for manufacturing membrane is chapped easily, has disadvantage and has thick membrane layer; the present invention prepares the inorganic membrane interface layer that the aperture can be adjusted within the range between 50 and 2nm and mainly relates to the preparation of sol gel, a new method for coating the sol gel and the adjustment and control of the aperture of the interface layer. The method has very strong popularity and is used for preparing the adaptive interface layer which synthesizes chemical atmosphere such as alkalescence or acidity towards a separation layer by selecting suitable ceramic material, and the method can meet the requirement of the preparation of the separation layer by adjusting and controlling the aperture. The present invention can be used for preparing the interface layer of the materials such as disilicon trioxide, dizirconium trioxide, dititanium trioxide, the composite oxide thereof, and the like, by dense or porous ceramic, quartz, glass, silicon chipor metal material substrate.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering, relates to inorganic molecular sieve membrane and sol-gel technology, in particular to the preparation of inorganic membrane mesoporous intermediate layer and its application in preparing high-performance and high-quality inorganic membrane. technical background [0002] Due to its good chemical, thermal stability and mechanical strength, inorganic membranes are used in the harsh medium and high temperature catalytic reactions of petrochemical operations, the separation of biochemical products, the separation of organic chemical products, the finishing treatment of beverages and drinking water, the electronics industry, etc. There are potential applications. Generally, a layer of membrane with a pore size of 0.1-1 μm prepared on a coarse-porous ceramic support as the bottom layer is called a microfiltration membrane, and a layer of a membrane layer with a pore size of 2 nm to 100 nm ...

AI Technical Summary

Problems solved by technology

[0004] The widely used intermediate layer material is γ-Al 2 o 3 , γ-Al 2 o 3 Corrosion resistance to strong acids and alkalis is poor, and according to Sweden's "Key Engineering Materials" (Key Engineering Materials) 1991, volume 61-62, page 383, γ-Al 2 o 3 film above 850°C from γ-Al 2 o 3 to α-Al 2 o 3 phase change, the pore size of the intermediate layer increases abnormally, leading to the destruction of the performance of the separation membrane

With regard to the preparation method of the film, researchers such as A.J.Burggraaf in the Netherlands and C.J.Brinker in the United States all use the method of applying at normal temperature, such as the pulling method or the method of rotating the way. A separate process, drying is a slow process. In the later stage of drying, due to the existence of capillary cohesion, the film is easy to crack and has defects, and due to the slow drying speed, the prepared film is thick.