GB/T 3145-2023 English PDF

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GB/T 3145-2023: Determination of benzene crystallizing point
Status: Valid

GB/T 3145: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 3145-2023	189	Add to Cart	3 days	Determination of benzene crystallizing point	Valid
GB/T 3145-1982	199	Add to Cart	2 days	Benzene. Determination of crystallizing point	Obsolete

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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Older Standard (superseded by this standard): GB/T 3145-1982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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