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GB/T 2092-2024: Sebacic acid for industrial use Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 2092: Historical versions
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/GBT2092-2024GB 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 ContentsForeword... 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... 12ForewordThis 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 Use1 ScopeThis 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 ReferencesThe 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 Method3 Terms and DefinitionsThis document does not have terms or definitions that need to be defined.4 Technical RequirementsThe technical requirements for sebacic acid for industrial use shall comply with the provisions of Table 1.5 Test Methods5.1 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 Rules6.1 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 Storage7.1 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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