GB/T 42269-2022Determination of the pore size of membranes - Gas permeation method (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part

1.Structure and Drafting Rules for Standardization Documents" drafting. Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed and managed by the National Standardization Technical Committee of Separation Membrane (SAC/TC382). This document was drafted by: Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Tianbang Membrane Technology National Engineering Research Center Co., Ltd., Shandong Zhaojin Motian Co., Ltd., Hohai University, Sanda Membrane Technology (Xiamen) Co., Ltd., Best Instrument Technology (Beijing) Co., Ltd., Foshan Shunde District Quality and Technical Supervision Standards and Coding Institute, Guangzhou Advanced Technology Research Institute, Tianjin Motianmo Technology Co., Ltd., Zhejiang Tailin Life Science Co., Ltd., Beijing Origin Water Separation Membrane Technology Co., Ltd., Hubei Jufu Membrane Technology Co., Ltd., Anhui Zhongke Xinyang Membrane Technology Co., Ltd., CNOOC Energy Conservation and Environmental Protection Service Co., Ltd., Xi'an Eagle Aviation Technology Co., Ltd., Suzhou Fumiao Membrane Technology Co., Ltd. Co., Ltd., Chongqing Osisis Environmental Protection Technology Co., Ltd., Sinochem (Ningbo) Runwo Membrane Technology Co., Ltd., Wanhua Chemical Group Co., Ltd. Division, Zhejiang Jinmembrane Environmental Technology Co., Ltd., Gongqi (Zhengzhou) Environmental Technology Co., Ltd., Shenzhen National Research Institute of High Performance Medical Devices Co., Ltd. Company, Hangzhou Kebaite Filter Equipment Co., Ltd., Zhejiang Dongou Filter Manufacturing Co., Ltd., Zhejiang Jingyuan Membrane Technology Co., Ltd., Zhejiang Jianghuiyong New Material Co., Ltd., Hunan Aowei Technology Co., Ltd., Jiangsu Nuolai Smart Water Equipment Co., Ltd., Tianjin Motianmo Engineering Co., Ltd. Cheng Technology Co., Ltd., Chongqing Moore Water Treatment Equipment Co., Ltd. The main drafters of this document. Wang Lina, Cao Yiming, Xu Youyou, Wang Xinyan, Gong Haichen, Qiu Zhuguo, Liu Jianfeng, Wang Fang, Chen Shunquan, Lu Xiaolong, Zou Kailun, Pei Zhiqiang, Wu Fugen, Wang Xiaolin, Liu Minghui, Xue Jin, Cai Ting, Ye Yang, Cao Chun, Wei Hanhui, Xu Yinong, Wang Tao, Zheng Hairong, Zhu Yang, Chen Benhua, Shen Xufeng, Cao Yi, Hu Qunhui, Yu Shuili, Wang Hanyi, Ma Bing, Jie Xingming, Gao Xu, Zhang Hongbin, Chen Jie, Xi Xuejie, Ma Lanyun. Separation Membrane Pore Size Test Method Gas Permeation Method

1 Scope

China's national method for determining the average pore size of separation membranes by gas permeation. The pore size is the property that defines what a membrane does - what it retains and what it passes - and measuring it is less direct than it sounds, because a membrane does not have a pore size but a distribution, and the pores are neither cylindrical nor straight. The gas permeation method infers the size from flow: gas is passed through the dry membrane at a series of pressures, and the relationship between flow and pressure distinguishes viscous flow through larger pores from Knudsen diffusion through smaller ones, from which a mean size follows. Its advantage over the bubble point and the liquid displacement methods is that it is non-destructive and needs no wetting liquid, so the membrane can be used afterwards - which matters when the sample is a module rather than a coupon.

This document describes a method for determining the average pore size of separation membranes using the gas permeation method. This document is applicable to the test of the average pore diameter of flat membranes and hollow fiber membranes with a pore diameter of 0.01 µm to 0.2 µm in a dry state. The separation membrane of the formula can be implemented with reference. This document is applicable to the test gas that is nitrogen, and other non-condensable gases, such as He, H2, O2, Ar, etc., can refer to this document for implementation.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 2918-2018 Standard environment for conditioning and testing of plastic specimens

GB/T 8979-2008 Pure Nitrogen, High Purity Nitrogen and Ultra Pure Nitrogen

GB/T 20103-2006 Membrane Separation Technical Terminology

3 Terms and Definitions

The following terms and definitions defined in GB/T 20103-2006 apply to this document.

3.1 flat membrane flatmembrane The appearance is a flat or paper-like film. NOTE. Flat sheet membranes usually have a support layer (e.g., non-woven fabric) for the preparation of plate-and-frame, pleated, and spiral-wound membrane elements. [Source: GB/T 20103-2006, 2.1.27]

3.2 Hollow fiber membrane holowfibermembrane The appearance is a fibrous, hollow, self-supporting membrane.

Note. For reverse osmosis membranes, the cortex is on the outer surface; for ultrafiltration and microfiltration membranes, the cortex is on the inner surface, outer surface, or inner and outer surfaces. [Source: GB/T 20103-2006, 2.1.28]

3.3 Aperture porediameter Nominal membrane pore diameter. [Source: GB/T 20103-2006, 2.1.31]

3.4 Average pore size meanporesize The average pore size of the membrane surface. [Source: GB/T 20103-2006,5.1.6]