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A method for measuring the pore size of a separation membrane

A measurement method and separation membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of membrane filament real pore size performance error, long production cycle, complex production, etc., and achieve high testing efficiency, The effect of short sample preparation cycle and convenient operation

Active Publication Date: 2018-08-07
SUZHOU NIUMAG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The obtained test results are the pore diameters displayed by the combined action of the inner surface layer, outer layer and support layer of the membrane filament, and the actual situation of the inner surface pore diameter and the outer layer pore diameter of the membrane filament cannot be obtained. Therefore, there is a large error with the actual pore diameter performance of the membrane filament
Moreover, since the sample needs to be poured and molded, the sample production is complicated and the production cycle is long, and the test results of the hollow fiber aperture cannot be obtained in time and quickly in industrial production

Method used

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  • A method for measuring the pore size of a separation membrane
  • A method for measuring the pore size of a separation membrane
  • A method for measuring the pore size of a separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Test the pore size parameters of hollow fiber membranes made of polyvinylidene fluoride (PVDF)

[0046] (1) Cut the separation membrane to be tested into small fragments of 5 mm long and put it into a container filled with alcohol, and place the container in a vacuum device to evacuate and saturate it for 4 hours until the membrane pores are filled with alcohol solution;

[0047] (2) Take out the separation membrane segment full of alcohol in the membrane hole from the alcohol solution, put it into a density meter equipped with alcohol solution and weigh its volume V;

[0048] (3) Take out the separation membrane segment after weighing the volume, wipe off the residual alcohol solution on the surface of the separation membrane and put it into a glass sample bottle;

[0049] (4) Put the glass sample bottle into the glass test tube, put the glass test tube into the low-field nuclear magnetic resonance instrument, the magnet strength is 0.52T, the center frequency of the a...

Embodiment 2

[0072] Test the pore size parameters of hollow fiber membranes made of polyethersulfone (PES)

[0073] (1) Cut the separation membrane to be tested into small fragments of 5 mm long and put it into a container filled with isopropanol, and place the container in a vacuum device to evacuate and saturate for 4 hours until the membrane pores are filled with isopropanol;

[0074] (2) Take out the separation membrane segment filled with isopropanol from the water in the membrane hole, put it into a density meter equipped with water and weigh its volume V;

[0075] (3) Take out the separation membrane segment after weighing the volume, wipe off the residual water on the surface of the separation membrane and put it into a glass sample bottle;

[0076] (4) Put the glass sample bottle into the glass test tube, put the glass test tube into the low-field nuclear magnetic resonance instrument, the magnet strength is 0.52T, the center frequency of the adjustment nuclear magnetic resonance ...

Embodiment 3

[0079] Test the pore size parameters of polyvinyl chloride (PVC) hollow fiber membranes

[0080] (1) Cut the separation membrane to be tested into small pieces of 5 mm long and put it into a container filled with distilled water, place the container in a vacuum device to evacuate and saturate it for 4 hours, until the membrane pores are filled with distilled water;

[0081] (2) Take out the separation membrane segment full of distilled water in the membrane hole from the distilled aqueous solution, put it into a density meter equipped with distilled water and weigh its volume V;

[0082] (3) The separation membrane segment after weighing the volume is taken out, and the residual distilled water solution on the surface of the separation membrane is dried and put into a glass sample bottle;

[0083] (4) Put the glass sample bottle into the glass test tube, put the glass test tube into the low-field nuclear magnetic resonance instrument, the magnet strength is 0.52T, the center f...

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Abstract

The invention discloses a method for measuring the pore size of a separation membrane, which comprises the following steps: (1) cutting the separation membrane to be tested into small pieces and putting them into a container containing an infiltration liquid, placing the container in a vacuum device to evacuate, until the membrane pores of the separation membrane are filled with immersion fluid; (2) the separation membrane fragments filled with immersion fluid in the membrane pores are taken out from the immersion fluid, put into a density meter equipped with immersion fluid and weighed for its volume V; (3) Take out the separation membrane fragment after weighing the volume, dry the residual infiltration solution on the surface of the separation membrane and put it into a glass sample bottle; (4) put the glass sample bottle into a glass test tube, and put the glass test tube into a low-field nuclear magnetic resonance instrument Start the test, and obtain the porosity, pore size and pore size distribution of the measured separation membrane through inversion calculation. The method for measuring the pore size of the separation membrane provided by the invention has simple operation and high precision.

Description

technical field [0001] The invention relates to a method for measuring the aperture of a separation membrane. Background technique [0002] In recent years, membrane separation technology has been widely used in the fields of pharmaceutical industry, chemical industry, petroleum, water treatment, food industry, seawater desalination, etc. Various types of filtration membranes, including microfiltration, ultrafiltration, nanofiltration, etc. development of. With the expansion of the application field of membrane technology, the requirements for the variety and performance of the membrane are getting higher and higher. Among the various properties of the membrane, people are most concerned about the separation performance and flux of the membrane, and these two properties are related to Therefore, it is particularly important to accurately test the membrane pore size and its distribution. [0003] At present, the test standards for the pore size performance in the membrane f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/10G01N24/08
CPCY02A20/131
Inventor 杨培强杨亮张英力蔡清
Owner SUZHOU NIUMAG ELECTRONICS TECH
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