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ASTM D7884-24

Current Revision

Standard Test Method for Determination of 4-Carboxybenzaldehyde and <emph type="bdit" >p</emph>-Toluic Acid in Purified Terephthalic Acid by Reverse Phase High Performance Liquid Chromatography

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1.1 This test method covers the determination of the 4-Carboxybenzaldehyde (4-CBA) and p-Toluic acid (p-TOL) in purified terephthalic acid (PTA) by reverse phase high performance liquid chromatography (HPLC). This method is applicable for 4-CBA and p- TOL with an upper limit of 500 mg/kg, respectively, but may be applicable to a wider range.

1.2 In determining the conformance of the test results using this method to applicable specification, results shall be rounded off in accordance with the rounding-off method of Practice E29.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.For specific hazard statements, see Section 7.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


4.1 The presence of 4-CBA and p-TOL in PTA used for the production of polyester is undesirable because they can affect the PET quality (such as contribute to fiber breaks), the polymerization process, and 4-CBA imparts coloration to the polymer due to thermal instability.

4.2 Determining the amount of 4-CBA and p-TOL remaining from the manufacture of PTA is often required. This test method is suitable for setting specifications and for use as an internal quality control tool where these products are produced or are used.

SDO ASTM: ASTM International
Document Number D7884
Publication Date March 1, 2024
Language en - English
Page Count 7
Revision Level 24
Supercedes
Committee D16.02
Publish Date Document Id Type View
March 1, 2024 D7884-24 Revision
Nov. 1, 2023 D7884-23 Revision
Oct. 1, 2020 D7884-20 Revision
Nov. 1, 2019 D7884-19 Revision
Aug. 1, 2013 D7884-13 Revision