This standard specifies the method for testing the maximum pore size of hollow fiber microporous membranes using the bubble point pressure method and the water flux test method. This standard is applicable to the test of the maximum pore size of hollow fiber microporous membranes made of different materials. HY/T 051-1999 Hollow fiber microporous membrane test method HY/T051-1999 standard download decompression password: www.bzxz.net
This standard specifies the method for testing the maximum pore size of hollow fiber microporous membranes using the bubble point pressure method and the water flux test method. This standard is applicable to the test of the maximum pore size of hollow fiber microporous membranes made of different materials.

ICS 07.060
Marine Industry Standard of the People's Republic of China
HY/T0511999
20021619
Test methods for hollow fiber microporous membrane
membranes1999-04-26 Issued
State Oceanic Administration Issued
1999-07-01 Implementation
HY/T051-1999
This standard refers to the American Society for Testing and Materials ASTMF316:1986 "Method for Determining the Pore Size Characteristics of Filter Membranes by Bubble Point Pressure Method and Average Flow Rate Method", ASTME128:1989 "Test Method for Maximum Aperture and Permeability of Rigid Porous Filter Membranes for Laboratory Use" and Japanese Industrial Standard JISK3832:1990 "Bubble Point Pressure Test Method for Membrane Filtration" JISK3831:1990 "Test Method for Initial Velocity of Membrane Filtration" and other relevant standards. Appendix A and Appendix B of this standard are standard appendices, and Appendix C is a suggested appendix. This standard was proposed by Tianjin Textile Engineering College. This standard is under the jurisdiction of the National Marine Standard and Metrology Center. This standard was drafted by Tianjin Textile Engineering College. The main drafters of this standard are Wei Jianmin, Dai Haiping, Zhang Huixin and Zhao Changsheng. Tianjin Textile Institute of Technology is entrusted with the interpretation of this standard. 1 Scope
Marine Industry Standard of the People's Republic of China
Test methods for hollow fiber microporous membranes
Test methods for hollow fiber microporous membranesHY/T 051--1999
This standard specifies the method for testing the maximum pore size of hollow fiber microporous membranes using the bubble point pressure method and the water flux test method. This standard is applicable to the test of the maximum pore size of hollow fiber microporous membranes of different materials. 2 Terms
This standard adopts the following definitions.
2.1 Pure water permeability purewaterflux
The amount of pure water permeating through a microporous membrane per unit time and per unit membrane area at a certain flow rate, temperature and pressure. 2.2 Initial bubble-point pressure For a membrane that has been pre-wetted with a suitable liquid, increase the gas pressure upstream of the membrane at a certain pressure increase rate, observe the bubbles in the liquid downstream of the membrane, and when the first dynamic continuous bubble is generated, the gas pressure applied is the initial bubble-point pressure. 2.3 Maximum pore diameter maximumporediameter The diameter of a circular capillary equivalent to the maximum pore of the membrane. 3 Test method
3.1 Test of pure water permeability
At an operating pressure of 0.1MPa and room temperature, test the amount of pure water permeability per unit time and unit membrane area. See Figure A1 in Appendix A (Standard Appendix) for the flow chart of pure water permeability test. 3.2 Principle of measuring the maximum pore diameter of microporous membrane by bubble point pressure method The test of maximum pore diameter is to apply H. Bechhold's bubble point pressure method. The principle is that for gas to pass through a capillary filled with liquid, it must have a certain pressure to overcome the surface tension between the liquid in the capillary and the interface. If the liquid used is completely infiltrated with the membrane, assuming that the membrane pore shape is cylindrical, the pore radius is calculated according to formula (1): 20
Wherein: r-pore radius, um;
-surface tension of the liquid, N/m;
-operating pressure, Pa.
4Test reagents
Mainly distilled water or water of equal purity;
Absolute ethanol: analytical grade;
High-purity high-pressure nitrogen or air.
Approved by the State Oceanic Administration on April 26, 1999
Implementation on July 1, 1999
5 Testing instruments
HY/T 051--1999
Nitrogen (or air) cylinder with regulating valve and pressure gauge; Pressure gauge: range 0~0.40MPa, 0~1.00MPa, different accuracy can be selected according to needs; Trace gas regulating valve;
-Hollow fiber membrane filter connector, equipped according to the size and shape of the sample; Liquid tank or container: beaker or measuring cylinder.
Schematic diagram of the bubble pressure method operation process
The schematic diagram of the bubble pressure method operation process is shown in Figure A2 in Appendix A (Standard Appendix). 7 Test steps
7.1 The test method for pure water permeability is the same as 3.1. 7.2 Bubble point pressure test
7.2.1 Sample preparation
Cast the hollow fiber microporous filter membrane into a U-shaped membrane sample of $10mm×(150mm～200mm), or a membrane sample with one end sealed. 7.2.2 Before the test, soak the sample in the corresponding test liquid to make it fully wet. 7.2.3 Connect the open end of the wetted sample to the membrane filter connector, and immerse the fiber part completely in the liquid tank containing the test liquid. 7.2.4 Turn on the high-pressure gas source, and slowly increase the system pressure through the trace gas regulating valve, observe the fiber surface, and when the first continuous bubble is generated on the fiber surface, read the pressure gauge reading, which is the starting bubble point pressure. If the same filter membrane is used for repeated tests, the membrane must be fully wetted again. 8 Calculation
8.1 Pure water permeability:
Where: F——-pure water permeability, m2/(m2.h); Q
-pure water permeation, m3;
A——membrane area, m\;
-time used to collect pure water permeation, h. 8.2 Calculation of membrane area:
Where: A
membrane area, m;
n number of hollow fiber membranes;
D-diameter of hollow fiber membrane (inner diameter for internal pressure membrane, outer diameter for external pressure membrane), m; L-effective length of hollow fiber membrane, m.
8.3 The maximum micropore diameter is calculated using formula (1). 8.4 See Appendix B (Standard Appendix) for the surface tension of the test liquid. 9 Test results
Two samples of each sample are taken for parallel testing at the same time, and the arithmetic mean of their test values ​​is taken as the test result. 2
(2)
(3)
10 Test report
The test report should include the following contents:
HY/T051—1999
a) Type, specification, batch number and manufacturer name of the test membrane sample; b) Room temperature and liquid temperature during the test; c) Test results;
d) Observation of phenomena during the test;
e) Test date;
f) Tester.
HY/T051-1999
Appendix A
(Appendix of the standard)
Pure water permeability test flow chart and bubble pressure method operation flow chart A1 Pure water permeability test flow chart See Figure A1. Permeation
1-storage tank; 2-pump; 3-pressure gauge; 4-microfiltration membrane assembly; 5-valve Figure A1·Pure water permeability test flow chart
A2 Bubble pressure method operation flow chart See Figure A2. 1-nitrogen bottle; 2-nitrogen pressure gauge 3-trace gas regulating valve 4-pressure gauge; 5-membrane sample connector; 6-glass container; 7-test liquid; 8-hollow fiber filter Figure A2·Bubble pressure method operation flow chart
The surface tension of the test liquid is shown in Table B1.
Temperature t, ℃bZxz.net
Surface tension.
10°N/m
HY/T 051—1999
Appendix B
(Standard Appendix)
Test liquid surface tension
Test liquid surface tension
Appendix ℃
(Suggestive Appendix)
References
ASTMF316:1986Method for determining filter membrane pore size characteristics by bubble point pressure method and average flow rate method2ASTME128:1989
Test method for maximum pore size and permeability of rigid porous filter membrane for laboratory use3.JISK3832:1990
Bubble point pressure test method for membrane filtration
JISK3831:1990
Test method for initial velocity of membrane filtration
HY/T039-1995
Test method for pore performance of microporous membrane
HY/T051-1999
Marine
Industry standard of the People's Republic of China
Test method for hollow fiber microporous membrane
HY/T051—1999
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