Novel tree-type nano-scale cylindrical pore filter membrane with 7 branch holes for liquid-liquid separation

Abstract

The invention relates to a novel tree-type nano-scale cylindrical pore filter membrane with 7 branch holes for liquid-liquid separation. A plurality of uniformly distributed tree-like cylindrical through holes are fabricated in a layer of solid material; each of the through holes comprises a larger main hole and seven smaller branch holes; the seven branch holes are parallel to the main hole thereof and completely communicate with the main hole; the surface material of the main hole is the same as that of the branch holes thereof; each branch hole is a filter hole; the length of each branch hole is determined according to strength requirements of each filter hole; the main hole is used to reduce the flow resistance of the filter membrane; the physical adsorption between a liquid in a liquid mixture to be separated and the surface of the main hole is weak, and the physical adsorption between the remaining liquid and the surface of the main hole is strong; the radius of each branch holeis: Rb,1=(0.1-0.2)Rcr, and Rcr is the critical cylindrical hole radius required to turn the liquid in the liquid mixture which is weakly physically adsorbed with the surface of the main hole into a continuous medium 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 novel tree-shaped nanoscale cylindrical pore filter membrane with 7 branch holes 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 ma...

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Problems solved by technology

Disadvantages: Activated carbon has large pores, it is difficult to achieve fine filtration, and it cannot filter out micron and nanoscale substances, and is often used for coarse filtration

[0009] Disadvantages of microporous membrane filtration: Compared with nanoporous membranes, the diameter of the filtration holes on microporous membranes is still too large. Although it can meet many fine filtration requirements in daily industry and life, it cannot be used to filter extremely small substances. Such as blood purification, virus separation in protein, ion filtration in liquid, super purification of water, etc.

[0012] Similar to microporous membrane filtration, the disadvantage of filter bag filtration is that the diameter of the filter holes on the filter bag is still too large. Although it can meet many fine filtration requirements in daily industry and life, it cannot be used to filter extremely small substances such as blood. Purification, virus separation in protein, ion filtration in liquid, super purification of water, etc.

The commonly used liquid-liquid separation methods described above are limited to two specific liquids with large differences in physical properties, such as large differences in density and mutual insolubility, or large differences in boiling points, or large differences in solubility of solutes in two solvents

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