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GB/T 3145-2023: Determination of benzene crystallizing point
Status: Valid GB/T 3145: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 3145-2023 | English | 189 |
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Determination of benzene crystallizing point
| Valid |
GB/T 3145-2023
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| GB/T 3145-1982 | English | 199 |
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Benzene. Determination of crystallizing point
| Obsolete |
GB/T 3145-1982
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PDF similar to GB/T 3145-2023
Basic data | Standard ID | GB/T 3145-2023 (GB/T3145-2023) | | Description (Translated English) | Determination of benzene crystallizing point | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G16 | | Classification of International Standard | 71.080.15 | | Word Count Estimation | 9,985 | | Date of Issue | 2023-11-27 | | Date of Implementation | 2024-03-01 | | Older Standard (superseded by this standard) | GB/T 3145-1982 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 3145-2023: Determination of benzene crystallizing point---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.
ICS 71:080:15
CCSG16
National Standards of People's Republic of China
Replace GB/T 3145-1982
Benzene crystallization point determination method
Published on 2023-11-27
2024-03-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration Committee
Foreword
This document complies with the provisions of GB/T 1:1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents"
Drafting:
This document replaces GB/T 3145-1982 "Method for determination of crystallization point of benzene": Compared with GB/T 3145-1982, except for structural adjustment and editing
In addition to sexual changes, the main technical changes are as follows:
a) The description and requirements for test tubes in the instrument have been changed (see 5:1, 5:2, 2:1, 2:2 of the 1982 edition);
b) Added requirements for test tube plugs (see 5:3);
c) Added refrigeration equipment as an option for cold baths (see 5:4);
d) Changed the requirements for thermometers in temperature measuring devices (see 5:6:1, 2:3 of the 1982 edition);
e) Added temperature measurement device options (see 5:6:2);
f) Added stirring device options (see 5:7);
g) Added "Reagents and Materials" (see Chapter 6);
h) Increased “hazards” (see Chapter 7);
i) Added requirements for placing thermal insulation materials inside the air casing (see 9:2);
j) Changed the sampling volume in the test procedure (see 10:1, 4:1 of the 1982 edition);
k) The criterion for identifying the crystallization point of water-containing samples in the test procedure has been changed (see 10:4, 4:3 of the 1982 edition);
l) Delete the requirement for calibration of the temperature of the exposed part of the mercury column of the thermometer (see 4:4 of the 1982 edition);
m) Added “Quality Control” (see Chapter 12);
n) Added content on the precision of benzene crystallization point when using a temperature sensor (see 13:3):
Please note that some content in this document may still involve patents: The publisher of this document assumes no responsibility for identifying patents:
This document is proposed and coordinated by the National Petroleum Products and Lubricants Standardization Technical Committee (SAC/TC280):
This document was drafted by: Jinling Branch of China Petroleum & Chemical Corporation:
The main drafters of this document: Zhou Guoxiao, Li Zhixing, Jiang Cailin, and Chen Huawei:
This document was first published in 1982 and this is the first revision:
Benzene crystallization point determination method
Warning---Personnel using this document must have practical experience in regular laboratory work: The use of this document may involve certain hazardous
materials, equipment and operations, this document does not identify all possible safety issues: Users are responsible for taking appropriate safety, health, and environmental
measures and ensure compliance with the conditions stipulated in relevant national laws and regulations:
1 Scope
This document describes a test method for the determination of the crystallization point of benzene:
This document is applicable to the determination of the crystallization point of benzene:
2 Normative reference documents
The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, the dated quotations
For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to
this document:
GB/T 514-2005 Technical specifications for liquid-in-glass thermometers for petroleum product testing
GB/T 4756 Manual sampling method for petroleum liquids
GB/T 6682-2008 Specifications and test methods for water used in analytical laboratories
GB/T 8170 Numerical rounding rules and expression and determination of limit values
3 Terms and definitions
The following terms and definitions apply to this document:
3:1
The highest temperature reached after initial crystallization of benzene in a liquid benzene sample when cooled under specified conditions:
Note: The unit is expressed in degrees Celsius (℃):
4 Summary of methods
When cooling under specified conditions, when the liquid phase benzene sample is cooled to a certain temperature and the solid phase appears, the temperature rises again, and the maximum temperature reached is
The degree is the crystallization point of benzene:
5 instruments
5:1 Air jacketed test tube
5:1:1 Inner tube: test tube, 125mm long, 15mm outer diameter:
5:1:2 Air casing: test tube, 150mm long, 25mm outer diameter:
5:2 Thick-walled test tubes
Glass test tube, 150mm long, 18mm outer diameter, 14mm inner diameter: Only used when measuring with a temperature sensor:
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