Inner filter multi-layer hollow fiber membrane

Abstract

The invention belongs to the technical field of membrane separation, relates to a fiber membrane, and particularly relates to an internal-filtration multilayer hollow fiber membrane. The technical problems that designs in the prior art are low in reasonableness and the like are solved. The internal-filtration multilayer hollow fiber membrane comprises an inner tube. A filter layer is arranged around the inner tube. The inner tube is a flexible tube and is formed by weaving fiber materials. The filter layer is coated on the outer surface of the inner tube and the filter layer is in a multi-layer structure. The filter accuracy of the inner tube is lower than that of the filter layer; and the filter accuracy of each layer in the filter surface layer is sequentially increased from inside to outside. The internal-filtration multilayer hollow fiber membrane has the advantages that the flexibility of the fiber membrane can be enhanced with the arrangement of the flexible inner tube formed by weaving fiber materials so as to meet the requirements of various liquids on filtering and purification; the filter layer is in the multilayer structure, and accordingly filter micropores of a main filter layer are less prone to block and the service life of the filter membrane is prolonged.

Description

technical field [0001] The invention belongs to the technical field of membrane separation and relates to a fiber membrane, in particular to a multi-layer hollow fiber membrane for internal filtration. Background technique [0002] Membrane separation is a process in which the selective separation of membranes is used to achieve the separation, purification, and concentration of different components of the feed liquid. Membrane separation technology was produced in the early 20th century and developed rapidly after the 1960s. The membrane wall is densely covered with micropores, the stock solution passes through one side of the membrane under a certain pressure, the solvent and small molecular solutes pass through the membrane wall as the filtrate, and the larger molecular solutes are retained by the membrane, so as to achieve the purpose of material separation and concentration. The difference from traditional filtration is that membrane separation technology can separate i...

AI Technical Summary

Problems solved by technology

However, since this solution consists of a single-layer filter membrane, it is difficult to meet the requirements of different liquids for filtration accuracy. At the same time, during long-term use, the filter pores in the fiber membrane are easily blocked, which affects filtration separation, and cannot be used for long-term operation.

In addition, the hollow fiber membrane has poor flexibility and is difficult to apply to the filtration and purification of various liquids.

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