Novel liquid-liquid separating filter membrane comprising tree-shaped nanoscale cylindrical holes with branch hole number of 6

Abstract

The invention relates to a novel liquid-liquid separating filter membrane comprising tree-shaped nanoscale cylindrical holes with the branch hole number of 6. A plurality of uniformly distributed tree-shaped cylindrical through holes are formed in a layer of solid material; each tree-shaped through hole comprises a relatively big main hole and 6 relatively small branch holes; the 6 branch holes are parallel to the main hole and are completely communicated with the main hole; the surface material of the main hole is the same as those of the branch holes thereof; the branch holes are filter holes, and the length of the branch holes is determined according to a requirement on the strength of the filter holes; the main holes are used for reducing the flow resistance of the filter membrane; physical adsorption between one type of liquid in a liquid mixture to be separated and the surfaces of the main holes is weak, and the physical adsorption between remaining liquid and the surfaces of themain holes is strong; the radius Rb, 1 of each branch hole is equal to (0.1-0.2)*Rcr, and Rcr is the critical cylindrical hole radius required when the liquid, the physical adsorption between which and the surfaces of the main holes is weak, in the liquid mixture forms a continuous medium flow; 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 nano-scale cylindrical pore filter membrane with six 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...

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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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