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GB/T 6287-2021: Determination of static adsorbed water for molecular sieve
Status: Valid GB/T 6287: Evolution and historical versions
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| GB/T 6287-2021 | English | 199 |
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Determination of static adsorbed water for molecular sieve
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GB/T 6287-2021
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| GB/T 6287-1986 | English | 199 |
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Determination of static adsorbed water for molecular sieve
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GB/T 6287-1986
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PDF similar to GB/T 6287-2021
Basic data | Standard ID | GB/T 6287-2021 (GB/T6287-2021) | | Description (Translated English) | Determination of static adsorbed water for molecular sieve | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G85 | | Word Count Estimation | 10,131 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 6287-2021: Determination of static adsorbed water for molecular sieve---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of static adsorbed water for molecular sieve
ICS 71.100.99
CCSG85
National Standards of People's Republic of China
Replace GB/T 6287-1986
Molecular sieve static water adsorption determination method
Released on 2021-08-20
2022-03-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
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 of Standardization Documents"
Drafting.
This document replaces GB/T 6287-1986 "Molecular Sieve Static Water Adsorption Determination Method", compared with GB/T 6287-1986, except for the structure
In addition to adjustments and editorial changes, the main technical changes are as follows.
a) The requirements for reagents or materials and samples for the saturated sodium chloride solution method have been added (see 4.2 and 4.4);
b) The equipment requirements and test procedures of the saturated sodium chloride solution method are refined (see 4.3 and 4.5, Chapter 2 and
Chapter 3);
c) Modified the precision requirements of the saturated sodium chloride solution method (see 4.7, 4.2 of the 1986 edition);
d) The test method of vacuum adsorption method has been added (see Chapter 5);
e) The requirements for test reports have been added (see Chapter 6).
Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents.
This document was proposed by the China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of the National Standardization Technical Committee for Fertilizers and Soil Conditioners (SAC/TC105).
Drafting organizations of this document. Shanghai Research Institute of Chemical Industry Co., Ltd., Shanghai Lvqiang New Material Co., Ltd., Huzhou Qiangqiang Molecular Sieve Technology Co., Ltd.
company.
The main drafters of this document. Wang Pengfei, Zhu Lin, Zhang Jia, Zhu Yi, Zhou Yongxian, He Qiuping, Wu Junsheng, Wu Yiwei.
The previous releases of this document and the documents it replaced are as follows.
---First published as GB/T 6287-1986 in 1986;
---This is the first revision.
Molecular sieve static water adsorption determination method
Warning---The personnel using this document should have practical experience in formal laboratory work. This document does not indicate all possible safety issues
question. The user is responsible for taking appropriate safety and health measures and ensuring compliance with the conditions stipulated by relevant national laws and regulations.
1 Scope
This document describes the saturated sodium chloride solution method and the vacuum adsorption method for molecular sieve static water adsorption determination.
This document is applicable to the determination of static water adsorption of various granular and powdered molecular sieves.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations
Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
This document.
GB/T 6678 General Rules for Sampling of Chemical Products
GB/T 6682 Analytical laboratory water specifications and test methods
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Staticwateradsorptioncapacity
After a certain amount of molecular sieve reaches equilibrium in a closed container with a certain concentration of water after a long period of full contact, the unit mass
The mass of water absorbed by the molecular sieve.
4 Saturated sodium chloride solution method
4.1 Principle
The saturated vapor pressure of saturated sodium chloride solution is stable under certain temperature conditions.
In a closed container, after adsorbing for a long enough time under certain temperature conditions, weigh the increase in the mass of the sample, and calculate the static water absorption
Attached amount.
4.2 Reagents or materials
Unless otherwise stated, only use analytical reagents.
Saturated sodium chloride solution. Dissolve analytically pure sodium chloride in water until it is saturated. The solution should contain obvious undissolved sodium chloride crystals. Place
The water used should conform to the third grade water specified in GB/T 6682.
4.3 Equipment
4.3.1 Blast drying oven. the working room is not less than 350mm×450mm×450mm, and the temperature difference is not more than ±1℃.
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