GB/T 2092-2024 PDF English
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Sebacic acid for industrial use
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GB/T 2092-2024: Sebacic acid for industrial use---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/GBT2092-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.080.40
CCS G 17
Replacing GB/T 2092-1992
Sebacic Acid for Industrial Use
Issued on. JULY 24, 2024
Implemented on. FEBRUARY 1, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 5
4 Technical Requirements... 5
5 Test Methods... 5
6 Inspection Rules... 10
7 Marking, Packaging, Transportation and Storage... 10
Appendix A (informative) Typical Chromatogram of Sebacic Acid Content
Determination and Retention Times of Various Components... 12
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives
for Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This document serves as a replacement for GB/T 2092-1992 Sebacic Acid for Industrial Use.
In comparison with GB/T 2092-1992, apart from structural adjustments and editorial
modifications, the main technical changes are as follows.
a) The technical requirements are modified. Superior products, first-class products and
qualified products are modified into the refined type and ordinary type. “Sebacic acid
content” is modified into “total acid (calculated as sebacic acid)”, the requirements
for sebacic acid are added, and the melting point range is modified (see Table 1; 3.2
of Version 1992);
b) The determination method for sebacic acid is added (see 5.4);
c) The sample weight for ash content determination is modified (see 5.5; 4.2 of Version
1992);
d) The determination method for moisture content is modified (see 5.6; 4.3 of Version
1992);
e) The determination method for melting point is modified (see 5.8; 4.5 of Version 1992).
Please be noted that certain content of this document may involve patents. The institution
issuing this document does not undertake the responsibility of identifying these patents.
This document was proposed by China Petroleum and Chemical Industry Federation.
This document shall be under the jurisdiction of National Technical Committee 63 on
Chemistry of Standardization Administration of China (SAC/TC 63).
The drafting organizations of this document. Hengshui Jinghua Chemical Industry Co., Ltd.;
Wilmar Polymer Materials (Lianyungang) Co., Ltd.; Shanxi Zhengang Biotechnology Co., Ltd.;
SINOPEC Beijing Research Institute of Chemical Industry; Jiangsu Zhongzheng Biochemical
Co., Ltd.; Suqian Unitechem Group Co., Ltd.
The main drafters of this document. Wang Haixia, Liu Lingjuan, Liang Rongyin, Luo Sha, Hu
Guangxing, Yu Qian, Zhang Xin, Zhu Yongning, Zhao Minghui, Su Yongsheng, Lin Junyi,
Zhang Rui.
This document was first issued in 1980 and first revised in 1992.This is the second revision.
Sebacic Acid for Industrial Use
1 Scope
This document specifies the technical requirements, test methods, inspection rules and marking,
packaging, transportation and storage of sebacic acid for industrial use.
This document applies to sebacic acid for industrial use, which is produced through hydrolysis
and splitting decomposition of castor oil.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 601 Chemical Reagent - Preparations of Standard Volumetric Solutions
GB/T 603 Chemical Reagent - Preparations of Reagent Solutions for Use in Test Methods
GB/T 617 Chemical Reagent - General Method for the Determination of Melting Range
GB/T 3143 Color Determination Method of Liquid Chemicals (Hazen unit - platinum - cobalt
scale)
GB/T 6283-2008 Chemical Products - Determination of Water - Karl Fischer Method (general
method)
GB/T 6284 Chemical Products for Industrial Use - General Method for Determination of Water
Content - The Loss of Mass on Drying Method
3 Terms and Definitions
This document does not have terms or definitions that need to be defined.
4 Technical Requirements
The technical requirements for sebacic acid for industrial use shall comply with the provisions
of Table 1.
5 Test Methods
5.1 General Provisions
The reagents and water used in this document, unless otherwise specified, refer to analytically
pure reagents and Grade-3 water that complies with the provisions of GB/T 6682.
5.2 Appearance Determination
Take an appropriate amount of sample and visually observe under natural light or fluorescent
light.
5.3 Determination of Total Acid (calculated as sebacic acid)
5.3.1 Method Summary
Use neutral ethanol solution to dissolve the sample, use sodium hydroxide standard titration
solution to directly titrate it, and use phenolphthalein as the indicator.
5.3.2 Reagents and solutions
5.3.3 Instruments and equipment
5.3.3.1 50 mL alkali burette.
5.3.4 Analytical steps
Weigh-take 1.5 g of sample (accurate to 0.0001 g) and place it in a 250 mL conical flask. Add
50 mL of neutral ethanol solution. After the specimen is completely dissolved, add 2 drops of
phenolphthalein indicator solution and use sodium hydroxide standard solution to titrate it, until
it turns slightly red. If it does not fade for 30 s, the end point is reached.
5.3.5 Result calculation
The mass fraction of total acid (calculated as sebacic acid) is calculated in accordance with
Formula (1).
5.3.6 Allowable difference
The absolute difference between the results of two parallel determinations is not greater than
0.2%. The arithmetic mean of the results of the two parallel determinations is taken as the
determination result. The calculation result is expressed to one decimal place.
5.4 Determination of Sebacic Acid
5.4.1 Method summary
Adopt gas chromatography. Sebacic acid and methanol undergo esterification reaction under
the action of concentrated sulfuric acid to generate fatty acid methyl esters, which are extracted
with n-hexane and, under selected working conditions, are vaporized and passed through a
capillary chromatographic column to separate the components. Use a hydrogen flame ionization
detector to detect the components and quantify them by the area normalization method.
5.4.2 Reagents and materials
5.4.2.1 Anhydrous methanol.
5.4.3 Instruments and equipment
5.4.3.1 Constant temperature water bath.
5.4.3.2 Gas chromatograph. equipped with hydrogen flame ionization detector (FID) and
injection splitter device. The sensitivity and stability of the whole instrument shall comply with
the relevant provisions of GB/T 9722.The linear range of the instrument shall satisfy the
requirements of quantitative analysis.
5.4.3.4 Micro-injector. 2 L.
5.4.4 Chromatographic columns and chromatographic operating conditions
The recommended chromatographic columns and chromatographic operating conditions are
shown in Table 2, and the typical chromatogram and retention times of the various components
are shown in Appendix A.
5.4.6 Result calculation
The mass fraction of sebacic acid is calculated in accordance with Formula (2).
5.5 Determination of Ash Content
In accordance with the provisions of GB/T 7531, carry out the determination. The sample
weight of ordinary samples is 15 g ~ 20 g, the sample weight of refined samples is 30 g ~ 50 g,
and the ignition temperature is 750 C.
5.6 Determination of Moisture Content
5.6.1 Loss of mass on drying method (arbitration method)
In accordance with the provisions of GB/T 6284, carry out the determination, and the sample
weight is about 5 g.
5.7 Determination of Alkali Solubility
In accordance with the provisions of GB/T 3143, carry out the determination. Weigh-take 3 g
of specimen (accurate to 0.1 g), place it in a 50 mL colorimetric tube, add 100 g/L potassium
hydroxide solution to the scale and shake it well.
5.8 Determination of Melting Point Range
In accordance with the provisions of GB/T 617, carry out the determination.
6 Inspection Rules
6.1 The items specified in Chapter 4 are all type inspection items, among which, all items except
the mass fraction of sebacic acid are exit-factory inspection items. Under normal circumstances,
type inspection shall be carried out at least once a year.
6.2 Batches shall be made in accordance with production shifts or dates. Each production shift
or every 24 hours shall constitute one batch.
6.3 Sampling shall be carried out in accordance with the provisions of GB/T 6678 and GB/T
6679.The sampling volume shall not be less than 500 g. Use a clean and dry sampler to take
samples from the top, middle and bottom of the packaging bag.
6.4 The inspection results shall be determined in accordance with the rounded value comparison
method specified in GB/T 8170.
7 Marking, Packaging, Transportation and Storage
7.1 Marking
7.1.1 The packaging bags of sebacic acid for industrial use shall have clear, obvious and firm
markings, which shall at least include the following contents.
7.1.2 Each batch of sebacic acid for industrial use shipped out of the factory shall be
accompanied by a quality certificate, which shall at least include the following contents.
7.2 Packaging
Sebacic acid for industrial use shall be packaged in polyethylene bags, plastic woven bags or
woven bags lined with plastic bags, with a net weight of 25 kg, 500 kg or 1,000 kg per bag, or
in packaging agreed upon by the supply-side and demand-side and in compliance with safety
regulations.
7.4 Storage
Sebacic acid for industrial use shall be stored in a cool and ventilated warehouse, and shall be
protected from fire and moisture.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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