Novel separation film and preparation method thereof

Abstract

The invention discloses a preparation method of a novel separation film, comprising the following steps of: respectively heating a starch cellulose film with water content of 5-30% and a protein film with water content of 5-30% to 100-150 DEG C and carrying out an expansion process to form a microporous hydrophilic film with micropores and a microporous hydrophobic film with the micropores, respectively. The microporous hydrophilic film and the microporous hydrophobic film are compounded to prepare a hydrophilic-hydrophobic, hydrophilic-hydrophobic-hydrophilic, hydrophobic-hydrophilic-hydrophobic composite film or the microporous hydrophilic film and the microporous hydrophobic film and a screen are compounded into an enhancing type separation film. The preparation method of the novel separation film has the advantages of favourable separation performance, low price, simple film-preparing process and low preparation cost.

Description

Technical field: [0001] The invention relates to a separation membrane which can be used in low-pressure membrane separation and membrane distillation processes and a manufacturing method thereof. Background technique: [0002] Membrane separation technology is widely used in food, chemical, pharmaceutical and other fields because of its high efficiency, energy saving and environmental protection. However, the existing membrane materials for membrane separation must not only ensure that they have good separation performance, but also ensure that the membrane can be used repeatedly for a long time, and that the membrane can withstand the pressure of the feed liquid and the repeated washing of the membrane, which greatly limits the choice of membrane materials. . Although there are only dozens of membrane-making processes after decades of development, there are only a dozen of them that can be maturely applied, which also greatly limits the development and application of memb...

AI Technical Summary

Problems solved by technology

However, the existing membrane materials for membrane separation must not only ensure that they have good separation performance, but also ensure that the membrane can be used repeatedly for a long time, and that the membrane can withstand the pressure of the feed liquid and the repeated washing of the membrane, which greatly limits the choice of membrane materials.

Although there are only dozens of membrane-making processes after decades of development, there are only a dozen of them that can be maturely applied, which also greatly limits the development and application of membrane technology.

The current membrane technology places great emphasis on the long-term use of the membrane. Concentration polarization and membrane fouling will inevitably occur when the membrane is used for a long time. If there is membrane fouling, membrane cleaning must be carried out, which also increases the complexity of the membrane process and its equipment.

The above reasons lead to high prices of membranes and membrane equipment, and high operating costs of membrane processes

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