Double-faced separating membrane

Abstract

The invention discloses a double-faced separating membrane. The double-faced separating membrane comprises a carrier layer (3) and control layers (1) respectively located at the two sides of the carrier layer (3), wherein the average pore size of membrane pores in the control layers is less than that of membrane pores in the carrier layer. The double-faced separating membrane has the advantages that on the one hand, matters passing through the double-faced separating membrane can be subjected to double-filtration, even though the pore diameters of individual membrane pores of the control layer at one side are relatively large to cause the entraining of impurities, the impurities can be filtered out by the membrane pores of the control layer at the other side, so that the separation accuracy and the distribution uniformity are improved, the double-faced separating membrane can cope with more matters, and the separation selectivity is relatively high; and on the other one hand, as the average pore size of the membrane pores of the control layers arranged at the two sides of the carrier layer is less than that of the membrane pores of the carrier layer, the separation operation carried out at the two sides can be respectively realized, the matters entering the double-faced separating membrane from any one side can pass through the carrier layer and do not block the carrier layer, so that the bidirectional filtration of the double-faced separating membrane is completed, and the application range of the double-faced separating membrane is enlarged.

Description

technical field [0001] The invention relates to the field of membrane separation, in particular to a double-sided separation membrane. Background technique [0002] In recent decades, the development of membrane separation technology has been extremely rapid, and the field of application of separation membranes has also continued to expand. It has been used in many fields such as food fermentation, medicine, bioengineering, petrochemical, aerospace, environmental protection engineering, etc. An emerging and efficient technology for separating, concentrating, purifying and purifying gases and liquids. Compared with traditional separation technology, membrane separation technology has the advantages of no phase change, energy saving and high efficiency, simple operation and no pollution to the processed materials, so it has attracted the attention of related industries. [0003] With the further application of membrane separation technology, problems that need to be studied a...

AI Technical Summary

Problems solved by technology

If the filtration operation is performed in the opposite direction, some larger particulate matter that can pass through the membrane pores of the carrier layer will not pass through the membrane pores of the control layer, but will be blocked in the membrane pores of the carrier layer, resulting in failure of the separation operation

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