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GB/T 2539-2023 English PDF

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GB/T 2539-2023: Determination of melting point of petroleum wax - Cooling curve method
Status: Valid

GB/T 2539: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 2539-2023English189 Add to Cart 3 days [Need to translate] Determination of melting point of petroleum wax - Cooling curve method Valid GB/T 2539-2023
GB/T 2539-2008English279 Add to Cart 3 days [Need to translate] Petroleum waxes -- Determination of melting point-cooling curve method Obsolete GB/T 2539-2008
GB/T 2539-1981English199 Add to Cart 2 days [Need to translate] Paraffins--Determination of melting point (cooling curve) Obsolete GB/T 2539-1981

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Basic data

Standard ID GB/T 2539-2023 (GB/T2539-2023)
Description (Translated English) Determination of melting point of petroleum wax - Cooling curve method
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard E42
Classification of International Standard 75.140
Word Count Estimation 10,131
Date of Issue 2023-09-07
Date of Implementation 2024-04-01
Older Standard (superseded by this standard) GB/T 2539-2008
Issuing agency(ies) State Administration for Market Regulation, National Standardization Administration

Similar standards

GB/T 4985   GB 1886.215   GB/T 11079   GB/T 8026   

GB/T 2539-2023: Determination of melting point of petroleum wax - Cooling curve method

---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 75.140 CCSE42 National Standards of People's Republic of China Replace GB/T 2539-2008 Determination of melting point of petroleum wax by cooling curve method Published on 2023-09-07 2024-04-01 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 2539-2008 "Cooling Curve Method for Determination of Melting Point of Petroleum Waxes". Compared with GB/T 2539-2008, except In addition to structural adjustments and editorial changes, the main technical changes are as follows. a) The scope of application of petroleum wax has been changed (see Chapter 1, 1.1 and 1.2 of the.2008 edition); b) The content of result calculation has been added to "Principles" (see Chapter 4); c) The table of technical parameters of melting point thermometers has been deleted (see Table 1 of the.2008 edition); d) Increased the tolerance of some values (see 5.1.2, 5.1.3 and 5.3.1); e) Added water bath thermometer range requirements (see 5.1.4); f) Added test tube plug and timer requirements to “Instrumentation and Equipment” (see 5.1.5 and 5.1.6); g) Added relevant content on automatic instruments (see 5.2, 7.2, 8.2 and 11.2); h) Added “sampling” and “quality control” requirements (see Chapter 6 and Chapter 10); i) Changed the content of the "Result Report" and added the requirements for arbitration testing in case of disputes (see Chapter 9, Chapter 8 of the.2008 edition). Please note that some content in this document may be subject to 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. China Petrochemical Corporation Dalian Petrochemical Research Institute, China National Petroleum Corporation Petrochemical Research Institute, PetroChina Dalian Petrochemical Branch, Sinopec Nanyang Energy and Chemical Co., Ltd., Dalian Far East Xing Instrument Co., Ltd., Changsha Fushunde Instrument Equipment Co., Ltd., Dalian Beigang Petroleum Instrument Co., Ltd. The main drafters of this document. Zhao Bin, Geng Chenchen, Li Shujie, Guo Shigang, Wang Gang, Guo Yuqian, Peng Na, Yan Pingxing, Wu Na, Jiang Lie, Wu Rongrong, Xu Zhiyang, Liu Tao, Guo Jintao, Liu Yanfeng, Wu Xianjun. This document was first published in 1981, revised for the first time in.2008, and this is the second revision. Determination of melting point of petroleum wax by cooling curve method Warning---Personnel using this document should 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 and health measures implementation, and ensure compliance with the conditions stipulated in relevant national laws and regulations.

1 Scope

This document describes the cooling curve method for determining the melting point of petroleum waxes. This document is applicable to the determination of the melting point of solid petroleum wax at room temperature. It is not applicable to petroleum grease, microcrystalline wax, petroleum grease, microcrystalline wax and paraffin wax. or the determination of the melting point of a mixture of crude paraffins.

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 27867 Automatic sampling method for petroleum liquid pipelines SH/T 0229 Sampling method for solid and semi-solid petroleum products

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 When cooling molten petroleum wax under specified conditions, the temperature at which the stagnation period first appears on the cooling curve.

4 Principles

Place the test tube containing the melted petroleum wax sample and the melting point thermometer in an air bath, and the air bath is placed in a water bath within a certain temperature range. During the cooling process of the specimen, record the readings of the melting point thermometer periodically. When the sample solidifies, the heat of fusion is released, and its temperature change rate decreases. Small, forming a stagnation period on the cooling curve. Calculate the average of 5 consecutive readings where the total difference does not exceed 0.10℃ for the first time as the sample. melting point.

5 Instruments and Equipment

5.1 Manual instruments 5.1.1 Melting point thermometer. rod type, local immersion, range is 38℃~82℃, minimum graduation is 0.1℃, and should comply with GB/T 514-2005 Technical requirements for No. GB -34 thermometer.
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