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GB/T 7702.20-2025: Test method for granular activated carbon from coal - Part 20: Determination of pore volume and specific surface area
Status: Valid GB/T 7702.20: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 7702.20-2025 | English | 359 |
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Test method for granular activated carbon from coal - Part 20: Determination of pore volume and specific surface area
| Valid |
GB/T 7702.20-2025
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| GB/T 7702.20-2008 | English | 259 |
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Test method for granular activated carbon from coal -- Determination of pore volume and specific surface area
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GB/T 7702.20-2008
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| GB/T 7702.20-1997 | English | 199 |
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Standard test method for granular activated carbon from coal--Determination of pore volume
| Obsolete |
GB/T 7702.20-1997
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Standard similar to GB/T 7702.20-2025 GB/T 7702.18 GB/T 7702.19 GB/T 7702.15 Basic data | Standard ID | GB/T 7702.20-2025 (GB/T7702.20-2025) | | Description (Translated English) | Test method for granular activated carbon from coal - Part 20: Determination of pore volume and specific surface area | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D24 | | Classification of International Standard | 75.160.10 | | Word Count Estimation | 18,122 | | Date of Issue | 2025-08-01 | | Date of Implementation | 2025-11-01 | | Older Standard (superseded by this standard) | GB/T 7702.20-2008 | | Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China | GB/T 7702.20-2025: Test method for granular activated carbon from coal - Part 20: Determination of pore volume and specific surface area
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT7702.20-2025
ICS 75.160.10
CCSD24
National Standard of the People's Republic of China
Replaces GB/T 7702.20-2008
Test methods for coal-based granular activated carbon
Part 20.Determination of pore volume and specific surface area
Released on August 1, 2025
Implementation on November 1, 2025
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
Introduction V
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Measurement Principle 3
5 Reagents and Materials 3
6 Instruments and Equipment 4
7 Sample preparation and degassing 5
8 Measurement Step 5
9 Result Processing 6
10 Measurement result precision 8
11 Quality Control 8
12 Test Report 8
Appendix A (Informative) Calculation of Micropore, Mesopore and Macropore Volumes 9
Preface
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.
This document is part 20 of GB/T 7702 Test methods for granular activated carbon from coal. GB/T 7702 has published the following parts.
--- Part 1.Determination of moisture;
--- Part 2.Determination of particle size;
--- Part 3.Determination of strength;
--- Part 4.Determination of packing density;
--- Part 5.Determination of water capacity;
--- Part 6.Determination of methylene blue adsorption value;
--- Part 7.Determination of iodine adsorption value;
--- Part 8.Determination of phenol adsorption value;
--- Part 9.Determination of fire point;
--- Part 10.Determination of the protection time of benzene vapor and ethyl chloride vapor;
--- Part 13.Determination of carbon tetrachloride adsorption rate;
--- Part 14.Determination of sulfur content;
--- Part 15.Determination of ash content;
--- Part 16.Determination of pH value;
--- Part 17.Determination of floating rate;
--- Part 18.Determination of caramel decolorization rate;
--- Part 19.Determination of carbon tetrachloride desorption rate;
--- Part 20.Determination of pore volume and specific surface area.
This document replaces GB/T 7702.20-2008 "Test method for granular activated carbon from coal - Determination of pore volume and specific surface area" and
Compared with GB/T 7702.20-2008, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) Some terms and definitions have been changed (see Chapter 3, Chapter 3 of the.2008 edition);
b) The true density of the sample tested by the original solvent oil method has been deleted, and the true density of the sample tested by the gas expansion method has been added (see 8.1 of the.2008 edition);
c) Added the requirements for sample degassing (see 7.2);
d) Added specific surface area data processing requirements (see 9.2.3);
e) Added quality control (see Chapter 11).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Coal Industry Association.
This document is under the jurisdiction of the National Coal Standardization Technical Committee (SAC/TC42).
This document was drafted by. Shanxi Xinhua Chemical Defense Equipment Research Institute Co., Ltd., China Ordnance Industry Standardization Institute, Coal Science and Technology
RESEARCH INSTITUTE LIMITED.
The main drafters of this document are. Guo Jingjing, Zhou Xiaodong, Wei Weihua, Ding Hua, Wu Linlin, Song Xiufeng, Wang Na, Wen Weili, Niu Ruihong, Wang Hui,
Hu Lan, Wen Yuhui, Guo Junjun, Hu Yuliang, Liang Yaling, Song Zhenchao, Xu Ling, Huang Jimin, Xing Haoyang, Ji Xinpeng, Li Xianfu, Yang Jing, and Tian Xin.
The previous versions of this document and the documents it replaces are as follows.
--- First issued as GB/T 7702.20-1987 in 1987, first revised in.1997;
---In the second revision in.2008, GB/T 7702.21-1997 "Test method for coal-based granular activated carbon - Determination of specific surface area" was incorporated.
The contents of GB/T 7702.21-1997 (the previous versions of GB/T 7702.21-1987)
---This is the third revision.
introduction
GB/T 7702.7 mainly involves the determination of iodine adsorption value of coal-based granular activated carbon. GB/T 7702.7 aims to improve the accuracy of analysis.
To improve the accuracy and shorten the analysis cycle, GB/T 7702 is planned to consist of 20 parts.
--- Part 1.Determination of moisture. The purpose is to evaluate the moisture content of activated carbon and provide a basis for subsequent customer use.
--- Part 2.Determination of particle size. The purpose is to evaluate the particle size distribution of activated carbon.
--- Part 3.Determination of strength. The purpose is to evaluate the wear resistance of activated carbon under certain conditions.
--- Part 4.Determination of packing density. The purpose is to evaluate the bulk weight of activated carbon and provide users with the unit volume of activated carbon.
The quality of the product can provide users with a filling volume based on the design during use.
--- Part 5.Determination of water capacity. The purpose is to evaluate the total pore volume of activated carbon and is a rapid test method during the production of activated carbon.
A practical approach.
--- Part 6.Determination of methylene blue adsorption value. The purpose is to evaluate the adsorption capacity of activated carbon submicropores, which is the decolorization of activated carbon liquid phase.
It is a major characterization method of adsorption capacity and is often used to evaluate activated carbon when used for liquid phase adsorption.
--- Part 7.Determination of iodine adsorption value. The purpose is to evaluate the microporous adsorption capacity of activated carbon, which is an indicator of the gas phase adsorption capacity of activated carbon.
A primary characterization method commonly used to evaluate activated carbon for gas phase adsorption.
--- Part 8.Determination of phenol adsorption value. The purpose is to evaluate the adsorption capacity of activated carbon for alkanes.
--- Part 9.Determination of fire point. The purpose is to evaluate the fire point of activated carbon and provide a design basis for users.
--- Part 10.Determination of the protection time of benzene vapor and ethyl chloride vapor. The purpose is to evaluate the protection performance of activated carbon.
--- Part 13.Determination of carbon tetrachloride adsorption rate. The purpose is to evaluate the saturated adsorption capacity of activated carbon for volatile organic compounds, mainly
It is used for activated carbon gas phase adsorption, and is generally used more for VOC adsorption.
--- Part 14.Determination of sulfur capacity. The purpose is to evaluate the static sulfur adsorption capacity of activated carbon, mainly used for raw gas desulfurization
Representation of ability.
--- Part 15.Determination of ash content. The purpose is to evaluate the oxidation degree of oxides of elements other than carbon in activated carbon.
--- Part 16.Determination of pH. The purpose is to evaluate the acidity or alkalinity of the solution after activated carbon is immersed in water.
--- Part 17.Determination of floating rate. The purpose is to evaluate the floating rate of activated carbon, which is the floating dust and bubbles on the surface of activated carbon in water.
The total content of the material.
--- Part 18.Determination of caramel decolorization rate. The purpose is to evaluate the decolorization ability of macropores in activated carbon, mainly used for liquid organic
Characterization of the ability of macromolecules to adsorb.
--- Part 19.Determination of carbon tetrachloride desorption rate. The purpose is to evaluate the ability of activated carbon to remove organic matter.
--- Part 20.Determination of pore volume and specific surface area. The purpose is to evaluate the pore distribution and adsorption capacity of activated carbon.
--- Part 21.Determination of liquid phase dynamic adsorption capacity. The purpose is to evaluate the dynamic removal of soluble pollutants from water by activated carbon.
ability.
--- Part 22.Determination of static adsorption capacity of liquid phase. The purpose is to evaluate the adsorption capacity of activated carbon for static removal of soluble pollutants in water.
ability.
Test methods for coal-based granular activated carbon
Part 20.Determination of pore volume and specific surface area
1 Scope
This document specifies the terms and definitions, determination principles, reagents and materials, instruments and equipment for the pore volume and specific surface area of coal-based granular activated carbon.
preparation, sample preparation and degassing, measurement steps, result processing, measurement result precision, quality control, test report, etc.
This document is applicable to the determination of pore volume and specific surface area of coal-based granular activated carbon, as well as the determination of pore volume and specific surface area of activated carbon prepared from other raw materials.
The determination of reference is used.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 6682 Specifications and test methods for water used in analytical laboratories
GB/T 19587-2017 Determination of specific surface area of solid substances by gas adsorption BET method
HG/T 3471 Chemical Reagent Mercury
3 Terms and Definitions
The terms and definitions defined in GB/T 19587-2017 and the following apply to this document.
3.1
adsorption
The accumulation of adsorbed gas on the external and accessible internal surfaces of solid materials.
[Source. GB/T 19587-2017, 3.1]
3.2
adsorbent
Solid material on which adsorption occurs.
[Source. GB/T 19587-2017, 3.5]
3.3
adsorbate
Adsorbed gas.
[Source. GB/T 19587-2017, 3.3]
3.4
The number of adsorbate molecules leaving the adsorbent surface per unit time is equal to the number of adsorbate molecules adsorbed, and the total number of adsorbed molecules is always
Remains unchanged.
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