Tree-like nano-scale cylindrical-hole filter membrane for liquid-liquid separation

Abstract

The invention relates to a tree-like nano-scale cylindrical-hole filter membrane for liquid-liquid separation. A plurality of through holes which are uniformly distributed and are of tree-shape structures are formed in a layer of solid material; each through hole comprises one larger cylindrical trunk hole and four smaller cylindrical branch holes; the four branch holes are communicated, on the same cross section of the trunk hole of the four branch holes, with the trunk hole; physical adsorption properties of the surfaces of the trunk holes and the surfaces of the branch holes of the trunk holes are the same; all the branch holes are filter holes; lengths of the branch holes are determined according to strength requirements of the filter holes; the trunk holes are used for reducing flow resistance of the filter membrane; the physical adsorption among one kind of liquid in a to-be-separated liquid mixture and the surfaces of the trunk holes is weak; the physical adsorption among rest liquid and the surfaces of the trunk holes is strong; the radius of each branch hole is Rb,1=(0.1 to 0.2)Rcr; the Rcr is the radius of a critical cylindrical hole needed for enabling the liquid, whichhas the weak physical adsorption with the surfaces of the trunk holes, in the liquid mixture to become a continuous medium to flow, and the layer of solid material is the filter membrane.

Description

technical field [0001] The invention relates to the field of filter membranes, in particular to a tree-shaped nano-scale cylindrical pore filter membrane used for liquid-liquid separation. Background technique [0002] Membrane for filtration, referred to as filter membrane, has important applications in industry and daily life. It can be used to filter out solid particles and impurities, purify liquids, and also to filter out bacteria and macromolecules, or to realize the separation of two liquids. separate. In daily life, filter membranes can be used to purify drinking water and various beverages, and can also be used to filter out impurities and various ions in seawater to achieve seawater purification. The existing commonly used filtering methods and means are: [0003] 1. Activated carbon filtration [0004] Activated carbon is an industrial adsorbent with a wide range of uses. It uses charcoal, various fruit shells and high-quality coal as raw materials, and crushes...

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Problems solved by technology

[0023] The purpose of the present invention is to provide a tree-shaped nano-scale cylindrical pore filter membrane for liquid-liquid separation, which solves the problem that the prior art is limited to the separation of two specific liquids with relatively different physical properties and difficult to separate liquids with similar densities. The technical problem of two liquids that dissolve each other and have similar boiling points

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