ASTM D7884 - 13

    Standard Test Method for Determination of 4-Carboxybenzaldehyde and p-Toluic Acid in Purified Terephthalic Acid by Reverse Phase High Performance Liquid Chromatography

    Active Standard ASTM D7884 | Developed by Subcommittee: D16.02

    Book of Standards Volume: 06.04


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    Significance and Use

    4.1 The presence of 4-CBA and p-TOL in PTA used for the production of polyester is undesirable because they can slow down 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.

    1. Scope

    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 from 2 to 500 mg/kg and for p-TOL from 10 to 500 mg/kg, respectively.

    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 and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D1193 Specification for Reagent Water

    D4790 Terminology of Aromatic Hydrocarbons and Related Chemicals

    D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

    E682 Practice for Liquid Chromatography Terms and Relationships

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

    ISO Document

    ENISO8213 Chemical products for industrial use--Sampling techniques--Solid chemical products in the form of particles varying from powders to coarse lumps

    Other Document

    OSHARegulations,29CF paragraphs 1910.1000 and 1910.1200


    ICS Code

    ICS Number Code 71.080.40 (Organic acids)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/D7884

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