Quantitative evaluation method of aperture of porous membrane

A quantitative evaluation and porous membrane technology, which is applied in the field of quantitative evaluation of porous membrane pore size, can solve the problems of conventional molecular weight cut-off method, such as cumbersome operation and consumption of reagents, and achieve good application value, less reagent consumption and less operation steps.

Pending Publication Date: 2020-12-08
江苏省科建成套设备有限公司
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  • Application Information

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Problems solved by technology

[0004] The invention provides a quantitative evaluation method for the pore size of a porous membrane, which can quickly, easily and economically quantify th

Method used

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  • Quantitative evaluation method of aperture of porous membrane
  • Quantitative evaluation method of aperture of porous membrane
  • Quantitative evaluation method of aperture of porous membrane

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Embodiment 1

[0030] like figure 2 As shown, a quantitative evaluation device for the pore size of a porous membrane includes a membrane tank, a feed liquid tank 9, a permeate tank 2, a first gear pump 10, a second gear pump 3, a first pressure gauge 8, and a second pressure gauge 5 , the first conductivity meter, the second conductivity meter, the first temperature control system 11, the second temperature control system 4 and the electronic balance 1, the membrane pool is divided into the feed liquid side 7 and the permeation side 6 by the membrane material, and the feed liquid side 7. The first gear pump 10 and the feed liquid tank 9 form a feed liquid circulation loop. The permeate side 6 forms a permeate circulation loop through the second gear pump 3 and the permeate tank 2. In the feed liquid tank 9 and the permeate tank 2, respectively, Set the first conductivity meter and the second conductivity meter, the first pressure gauge 8 and the first flow meter are placed on the pipeline ...

Embodiment 2

[0037] Choose the 2 micron CA water-washed cellulose acetate membrane as the base membrane, filter the multi-walled carbon nanotube dispersion liquid modified by dopamine on its surface, and filter 1, 3, 4, 5 ml respectively (marked as CNT-1, CNT-2, CNT-3, CNT-4), after standing and drying, the molecular weight cut-off method was used to measure the molecular weight cut-off as 57000, 25000, 20000 and 10000 Da respectively. In the same way, the ratio (Js / C feed,s ),As shown in table 2. Take the operating pressure as the abscissa, and J s / C feed,s Values ​​are plotted on the ordinate (such as Figure 4 shown), the convective permeability coefficients of different ultrafiltration membranes can be obtained by using the least square method, and PC-1, PC-2, PC-3, and PC-4 correspond to 5.413LMH / bar, 4.20LMH / bar, and 3.83LMH respectively / bar and 3.67LMH / bar. Linear fitting of the molecular weight cut off and the convective diffusion coefficient, it can be found that the two ar...

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Abstract

The invention discloses a quantitative evaluation method for the aperture of a porous membrane. The method comprises the following steps: firstly, measuring convective permeability coefficients of membrane materials with different molecular weight cutoff and a membrane material to be measured, then establishing a linear relationship between a molecular weight cutoff Mw and a convective permeability coefficient Ld of the membrane material, finally substituting the convective permeability coefficient of the membrane material to be measured into a relational expression between the Mw and the Ld,and further obtaining the convective diffusion coefficient Mw of the membrane. The method can greatly reduce the use amount of a test reagent, shorten the test time and reduce the test flow, does notneed an expensive evaluation device, and has good application values in quantitative evaluation of the aperture of porous membranes such as ultrafiltration membranes and ultrafiltration forward osmosis membranes.

Description

technical field [0001] The invention belongs to the technical field of membrane parameter evaluation, and in particular relates to a quantitative evaluation method for the aperture of a porous membrane. Background technique [0002] Accurate determination of the pore size of porous membranes has important guiding significance for the regulation and application of porous membrane structures. At present, the commonly used method for evaluating the pore size of porous membranes is the molecular weight cut-off method (MWCO). This method calculates the pore size of the porous membrane by measuring the rejection rate of the porous membrane to a series of substances with different molecular weights. In order to obtain the rejection rate data, the MWCO method must determine the standard working curve of the standard substance in advance; in addition, when the membrane pores are unknown, the membrane pore size must be estimated. Therefore, the operation steps of MWCO method are cum...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0826G01N15/088G01N2015/086
Inventor 陈佑勇马准高学理
Owner 江苏省科建成套设备有限公司
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