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Method for testing pore diameter distribution of ultra-filtration membrane

A technology of ultrafiltration membrane and pore size, which is applied in the fields of semi-permeable membrane separation, chemical instruments and methods, suspension and porous material analysis, etc. It can solve the problems that ultrafiltration membrane pore size analyzers are rare, etc., and achieve simple operation and improved The degree of automation and the effect of improving stability

Active Publication Date: 2015-03-04
GAOQ FUNCTIONAL MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are not many ultrafiltration membrane pore size analyzers related to the market, and it is even blank in China.

Method used

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  • Method for testing pore diameter distribution of ultra-filtration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0036] 1. Mix isobutanol and deionized water in equal volumes. After standing and stratifying, the upper oil phase is used as the immersion liquid, and the water phase is used as the replacement liquid. The interfacial tension between the immersion liquid and the replacement liquid is 1.7mN / m at 20°C.

[0037] 2. Put the membrane into the module (7), seal it and fix it, open the test software, set the maximum pressure to 150kPa, the maximum flow rate to 3ml / min and the flow increase rate of the constant flow pump to 0.01ml / min, click to start the test.

[0038] 3. The software automatically opens the solenoid valve (12), and makes the constant flow pump (6) enter the liquid at a relatively large flow rate, and the replacement liquid gradually fills the stainless steel pipeline, the membrane module (7) and the cavity of the pressure transmitter, and its system When the replacement fluid reaches the vertical pipeline, the pressure sensor 2 (10) will sense a certain pressure due t...

Embodiment example 2

[0046] 1. Mix equal volumes of n-pentanol and deionized water, and after standing for stratification, the upper oil phase is used as the immersion liquid, and the water phase is used as the replacement liquid. The interfacial tension between the immersion liquid and the replacement liquid is 4.8mN / m at 20°C.

[0047] 2. Except that the maximum pressure is set to 400kPa and the maximum flow rate is 4ml / min, the rest of the operation steps are the same as the implementation case 1. Finally, the maximum pore size of the ultrafiltration membrane was calculated to be 163.6nm, and the average pore size was 77nm.

Embodiment example 3

[0049] 1. Mix water, methanol, and isobutanol at a volume ratio of 25:7:15. After standing for stratification, the upper oil phase is used as the immersion liquid, and the water phase is used as the replacement liquid. The interfacial tension between the immersion liquid and the replacement liquid at 20°C is 0.35mN / m.

[0050] 2. Except that the maximum pressure is set to 300kPa and the maximum flow rate is 3ml / min, the rest of the operation steps are the same as the implementation case 1. Finally, the maximum pore size of the ultrafiltration membrane is calculated to be 32nm, and the average pore size is 11.8nm.

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Abstract

The invention relates to a method for testing the pore diameter distribution of an ultra-filtration membrane and relates to a full-automatic ultra-filtration membrane pore diameter analyzer. The full-automatic ultra-filtration membrane pore diameter analyzer comprises a high-precision constant-flow pump, a pressure transmitter, a solenoid valve, a relay, a data acquisition module, a computer, a membrane test assembly and a pipeline, wherein the signal output end of the computer is connected with the signal input end of the constant-flow pump and is used for controlling liquid charging flow of the constant-flow pump by virtue of software; the pressure transmitter is arranged between the constant-flow pump and the test assembly; the signal end of the pressure transmitter is connected with the data acquisition module and is used for collecting pressure of a system in real time; the input end of the relay is connected with the computer to control the solenoid valve, thereby achieving the purpose of blocking the system pipeline. The full-automatic ultra-filtration membrane pore diameter analyzer is capable of automatically exhausting and measuring the system, collecting a balance pressure value and penetrating fluid flow of the system in real time and analyzing the property of the membrane material by virtue of a pressure-flow curve.

Description

technical field [0001] The invention relates to a fully automatic ultrafiltration membrane pore size analyzer and a testing method thereof, which are used for testing the pore size distribution of porous ultrafiltration membranes. Background technique [0002] The rapid development of porous membrane separation technology, especially the wide application of ultrafiltration membrane technology in industrialization, the rapid development of nanofiltration membrane technology, and the dominance of organic membrane materials in the current market, have a great impact on analytical instruments that can measure smaller membrane pore sizes at low pressure. Raise higher market expectations. [0003] The liquid-liquid discharge method is based on the capillary tension of the liquid in the capillary channel, and measures the flow-pressure relationship when the replacement fluid penetrates the membrane material filled with the infiltrating fluid in the channel, and the relationship bet...

Claims

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Application Information

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IPC IPC(8): B01D65/10G01N15/08
Inventor 俞健杨佳辉黄彦刘强魏浩谌洪图张桃飞蔡毅巩栋栋
Owner GAOQ FUNCTIONAL MATERIALS
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