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GB/T 7717.15: Historical versions
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Acrylonitrile for industrial use -- Part 15: Determination of content of p-hydroxyanisole
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| GB/T 7717.15-1994 | English | 159 |
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Acrylonitrile for industrial use. Determination of content of p-hydroxylanisole. Spectrophotometric method
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Basic data
| Standard ID | GB/T 7717.15-2018 (GB/T7717.15-2018) |
| Description (Translated English) | Acrylonitrile for industrial use -- Part 15: Determination of content of p-hydroxyanisole |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | G17 |
| Classification of International Standard | 71.080.30 |
| Word Count Estimation | 10,124 |
| Date of Issue | 2018-03-15 |
| Date of Implementation | 2018-10-01 |
| Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration |
GB/T 7717.15-2018: Acrylonitrile for industrial use -- Part 15: Determination of content of p-hydroxyanisole
---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.
Acrylonitrile for industrial use--Part 15. Determination of concent of p-hydroxylanisole
ICS 71.080.30
G17
National Standards of People's Republic of China
Replacing GB/T 7717.15-1994
Acrylonitrile for industrial use
Part 15. Determination of p-hydroxyanisole content
Part 15. Determinationofconcentofp-hydroxylanisole
Published by.2018-03-15
2018-10-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration released
Foreword
GB/T 7717 "Acrylonitrile for Industry" has or plans to issue the following parts.
--- Part 1. Specifications;
--- Part 5. Determination of acidity, pH, and titration values;
--- Part 8. Determination of total aldehyde content by spectrophotometric method;
--- Part 9. Determination of total cyanide content by titration;
--- Part 10 . Determination of peroxide content ; Spectrophotometric method ;
--- Part 11. Determination of iron, copper content spectrophotometric method;
--- Part 12 . Determination of purity and impurity content by gas chromatography ;
--- Part 15. Determination of p-hydroxyanisole content;
Part 16 . Determination of iron content by graphite furnace atomic absorption spectrometry ;
-- Part 17 . Determination of copper content by graphite furnace atomic absorption spectrometry
This section is part 15 of GB/T 7717.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces GB/T 7717.15-1994 "Determination of p-hydroxyanisole content in acrylonitrile for industrial use spectrophotometric method", this Part
The main technical changes compared with GB/T 7717.15-1994 are as follows.
---Modified the standard name;
--- Modify the scope (see Chapter 1, Chapter 1 of the.1994 edition);
--- Increased gas chromatography (see Chapter 4, Chapter 5);
--- Increased quality assurance and control (see Chapter 6);
--- Modify the unit of measurement for p-hydroxyanisole content (mass fraction) from % to mg/kg.
This part was proposed by China Petroleum & Chemical Corporation.
This part is under the jurisdiction of the Petrochemical Subcommittee (SAC/TC63/SC4) of the National Chemical Standardization Technical Committee.
This section was drafted by. China Petroleum & Chemical Corporation Shanghai Petrochemical Research Institute, Shanghai Petrochemical Corporation,
Shanghai Secco Petrochemical Co., Ltd.
The main drafters of this section. Peng Zhenlei, Qian Senzhi, Liu Zhaoxia, Zhang Yuhong, Zhu Yuping, Fan Chenliang, and Ge Qinfen.
The previous editions of the standards replaced by this section are.
--- GB/T 7717.15-1994.
Acrylonitrile for industrial use
Part 15. Determination of p-hydroxyanisole content
Caution - This section is not intended to describe all safety issues related to its use. Users have the responsibility to take appropriate safety and
Health measures to ensure compliance with the provisions of the relevant national laws and regulations.
1 Scope
This part of GB/T 7717 specifies the spectrophotometric method and gas phase for the determination of p-hydroxyanisole (MEHQ) in acrylonitrile for industrial use.
Chromatography, repeatability, quality assurance and control, test reports.
This part of the spectrophotometric method is applicable to industries where the content of p-hydroxyanisole is not less than 5mg/kg and the color degree conforms to the requirements of GB/T 7717.1.
Determination of acrylonitrile; This part of gas chromatography is suitable for industrial use with p-hydroxy anisole content in the range of 1 mg/kg to 100 mg/kg.
Determination of acrylonitrile.
Note. When using spectrophotometric method, impurities absorbed at 295nm all interfere with the determination. Experience shows that it may produce in acrylonitrile that exceeds storage guarantee period.
Absorbed impurities are generated at this wavelength.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 3723 General rules for sampling safety of industrial chemical products
GB/T 6678 sampling rules for chemical products
GB/T 6680 sampling principle of liquid chemical products
GB/T 6682 Analysis Laboratory Water Specifications and Test Methods
GB/T 7717.1 Acrylonitrile for industrial use Part 1. Specifications
GB/T 8170 Representation and Determination of Numerical Rounding Rules and Limit Values
3 Spectrophotometry
3.1 Principle
The absorbance of p-hydroxyanisole in the sample was measured directly at 295 nm using an ultraviolet spectrophotometer, and the hydroxyl was determined on the basis of a standard curve.
The content of benzyl anisole.
3.2 Reagents and materials
Unless otherwise stated, the reagents used were all analytically pure and the water used complied with the tertiary water specification specified in GB/T 6682.
3.2.1 p-hydroxyanisole. purity not less than 99% (mass fraction).
3.2.2 Sodium hydroxide solution. 4% (mass fraction) of aqueous solution.
3.2.3 Acrylonitrile without p-hydroxyanisole. Into a 500-mL separatory funnel, inject 100 mL of acrylonitrile and.200 mL of sodium hydroxide solution.
The liquid (3.2.2) is shaken, the aqueous layer is removed, and the acrylonitrile layer is retained. Take another acrylonitrile, repeat the above extraction process, collect about 500mL of propylene
Nitrile. The treated acrylonitrile is then distilled to collect a middle distillate having a boiling point of 75.5°C to 79.5°C.
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