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Test methods of purified terephthalic acid (PTA) for industrial use - Part 6: Determination of particle size distribution
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Test method of purified terephthalic acid (PTA) for industrial use -- Part 6: Determination of particle size distribution
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Basic data
| Standard ID | GB/T 30921.6-2025 (GB/T30921.6-2025) |
| Description (Translated English) | Test methods of purified terephthalic acid (PTA) for industrial use - Part 6: Determination of particle size distribution |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | G16 |
| Classification of International Standard | 71.080.40 |
| Word Count Estimation | 12,151 |
| Date of Issue | 2025-12-02 |
| Date of Implementation | 2026-07-01 |
| Older Standard (superseded by this standard) | GB/T 30921.6-2016 |
| Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China |
GB/T 30921.6-2025: Test methods of purified terephthalic acid (PTA) for industrial use - Part 6: Determination of particle size distribution
---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 71.080.40
CCSG16
National Standards of the People's Republic of China
Replaces GB/T 30921.6-2016
Test methods for industrial purified terephthalic acid (PTA)
Part 6.Determination of Particle Size Distribution
Published on 2025-12-02
Implemented on July 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
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 is Part 6 of GB/T 30921, "Test Methods for Purified Terephthalic Acid (PTA) for Industrial Use". GB/T 30921 has been issued.
The following parts were laid out.
---Part 1.Determination of p-carboxybenzaldehyde (4-CBA) and p-methylbenzoic acid (p-TOL) content;
---Part 2.Determination of Metal Content;
---Part 3.Determination of water content;
---Part 4.Determination of Titanium Content. Diantipyrin Methane Spectrophotometric Method;
---Part 5.Determination of Acid Value;
---Part 6.Determination of Particle Size Distribution;
---Part 7.Determination of b* value using a colorimeter.
This document replaces GB/T 30921.6-2016 "Test Methods for Industrial Purified Terephthalic Acid (PTA) - Part 6.Particle Size Distribution".
Compared with GB/T 30921.6-2016, the main technical changes in the "Determination" standard are as follows, except for structural adjustments and editorial modifications.
---The scope has been changed (see Chapter 1, Chapter 1 of the.2016 edition);
---The non-legal unit of measurement "mesh" for particle size and sieve aperture has been removed (see 3.2.1 and 3.3.2 in the.2016 edition);
---A dynamic image method has been added (see Chapter 7);
---Quality control has been added (see Chapter 8).
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Chemical Standardization (SAC/TC63).
This document was drafted by. China Petroleum & Chemical Corporation Yangzi Petrochemical Co., Ltd., China Petroleum & Chemical Research Institute Co., Ltd., and China Petroleum & Chemical Corporation.
Petrochemical Yizheng Chemical Fiber Co., Ltd., and Fuld (Shanghai) Instrument Equipment Co., Ltd.
The main drafters of this document are. Yang Shan, Lei Zhiwen, Shao Qiang, Wang Chuan, Li Chengwei, Ye Huili, Zhong Xuanmeng, Yu Hao, Song Kui, Wang Liting, and Gu Yufeng.
Li Dingsong and Yang Kan.
This document was first published in.2016, and this is its first revision.
Introduction
GB/T 30921 "Test Methods for Purified Terephthalic Acid (PTA) for Industrial Use" is equivalent to GB/T 32685 "Purified Terephthalic Acid (PTA) for Industrial Use".
The supporting methodology standard is proposed to consist of seven parts.
---Part 1.Determination of p-carboxybenzaldehyde (4-CBA) and p-methylbenzoic acid (p-TOL) content. Includes high performance liquid chromatography.
The method and high-performance capillary electrophoresis were used to describe the properties of p-carboxybenzaldehyde (4-CBA) in industrial purified terephthalic acid (PTA).
Test methods for determining the content of p-toluic acid (p-TOL).
---Part 2.Determination of Metal Content. This includes flame atomic absorption spectrophotometry, graphite furnace atomic absorption spectrophotometry, and electrochemical atomic absorption spectrophotometry.
Inductively coupled plasma atomic emission spectrometry (ICP-AES). The purpose is to describe the experimental method for determining the metal content of industrial purified terephthalic acid (PTA).
method.
---Part 3.Determination of Water Content. This includes Karl Fischer volumetric method and thermogravimetric method. The aim is to describe the water content of industrially purified terephthalic acid.
Test method for determining the water content of formic acid (PTA).
---Part 4.Determination of Titanium Content using Diantipyrrolidone Spectrophotometric Method. The purpose is to describe the process of determining the content of purified terephthalic acid for industrial use.
Test method for determining titanium content (PTA).
---Part 5.Determination of Acid Value. This includes indicator methods and potentiometric titration. The purpose is to describe the acid value of industrially purified terephthalic acid.
Test methods for determining the value.
---Part 6.Determination of Particle Size Distribution. This includes air jet sieving, laser diffraction, and dynamic imaging methods. The aim is to describe...
Test method for determining the particle size distribution of industrial purified terephthalic acid (PTA).
---Part 7.Determination of b* value using a colorimeter. The purpose is to describe the test method for determining the b* value of industrial purified terephthalic acid (PTA).
Verification method.
Test methods for industrial purified terephthalic acid (PTA)
Part 6.Determination of Particle Size Distribution
Warning. This document is not intended to address all safety concerns related to its use. Users are responsible for taking appropriate safety and health precautions.
Measures shall be taken to ensure compliance with the relevant national laws and regulations.
1 Scope
This document describes the air jet sieving method, laser diffraction method, and dynamic graph method for determining the particle size distribution of industrial purified terephthalic acid (PTA).
Image method.
The scope of this document is as follows.
---Air jet sieving is suitable for determining the particle size distribution of PTA samples ranging from 10 μm to 4000 μm;
---Laser diffraction is suitable for determining the particle size distribution of PTA samples ranging from 1 μm to.2000 μm;
---The dynamic image method is suitable for the determination of PTA samples with a particle size distribution range of 0.8μm to 5000μm.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 3723 General Safety Rules for Sampling of Industrial Chemical Products
GB/T 6679 General Rules for Sampling of Solid Chemical Products
GB/T 6682 Specifications and test methods for water used in analytical laboratories
GB/T 8170 Rules for rounding off numerical values and the representation and determination of limiting values
GB/T 19077 Particle size analysis by laser diffraction
GB/T 21649.2 Particle size analysis—Image analysis method—Part 2.Dynamic image analysis method
3 Terms and Definitions
This document does not contain any terms or definitions that need to be defined.
4 samples
Samples shall be taken in accordance with the technical requirements specified in GB/T 3723 and GB/T 6679.
5.Air jet sieving method
5.1 Method Summary
A set of specialized sieves was used to sieve the samples one by one on an air jet sieve (1% carbon black was added to eliminate the generated static electricity), and then the measurements were performed.
...
