A press filter membrane for separating furfural with high temperature resistance, preparation method and application thereof

Abstract

The invention belongs to the technical field of film separation, and specifically, relates to a high temperature-resisting filter pressing film for separating furfural, a preparation method thereof and application thereof in furfural separation. The high temperature-resisting filter pressing film for separating the furfural is prepared from the following raw materials: a film forming material, a solvent, a film forming additive, a dispersing agent, a plasticizing agent, a defoaming agent, a dehydrating agent, a high temperature-resisting protective agent, a compressive protective agent, accessories and the like. Primary experiment detection shows that the high temperature-resisting filter pressing film provided by the invention has better high temperature-resisting property and has good acid-base corrosion resistance at the same time; the high temperature-resisting filter pressing film has higher film flux, good machinability and good thermal stability, and has a very important application value in increasing the yield of the furfural and reducing film separation time; meanwhile, since the high temperature-resisting filter pressing film has the characteristics that film pollution is reduced and the service life is longer, a higher popularization and application value is obtained.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and specifically relates to a high-temperature-resistant filter press membrane for separating furfural, a preparation method of the filter press membrane and a patent application for its application in furfural separation. Background technique [0002] The preparation of furfural from biomass waste (corn cobs, corn stalks, etc.) by high temperature hydrolysis is the existing mainstream furfural preparation process. In the production process of this process, after the high-temperature hydrolysis reaction of the biomass waste, a furfural-containing hydrolysis stock solution is generated, which contains a relatively low concentration of furfural, acetyl, propionic acid and other main products, and then the furfural is separated by an appropriate separation process come out. [0003] When furfural is separated from the hydrolysis stock solution, rectification method or membrane separatio...

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Problems solved by technology

[0003] When furfural is separated from the hydrolysis stock solution, rectification method or membrane separation method is usually adopted. When rectification method is adopted, the main principle is to separate according to the different boiling points of the production products. However, due to the high water content in the hydrolysis stock solution, Therefore, it is necessary to consume a large amount of heat source to evaporate the water, and it also needs to consume a large amount of heat source to evaporate and separate the separated products. Due to the high energy consumption of this production method, the cost remains high; when the membrane separation method is used, the hydrolysis can be directly performed The original solution is separated, so it has the advantage of lower energy consumption, but because the hydrolysis original solution contains a certain concentration of acid, and the temperature of the hydrolysis original solution just out of the reaction device is relatively high (about 80 ° C), it is very important for the selection of the separation membrane. , and ordinary separation membranes cannot meet the high temperature separation requirements and cannot withstand higher pressures, resulting in longer separation time and lower separation efficiency, which makes the membrane separation method very limited in production applications.

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