Standard Test Method for Determination of 4-Carboxybenzaldehyde and p-Toluic Acid in Purified Terephthalic Acid by Capillary Electrophoresis with Reverse Voltage Mode

Importancia y uso:

5.1 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 is also imparting coloration to the polymer due to thermal instability.

5.2 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 where these products are produced or used.

5.3 This test method is intended as an alternative to the HPLC method for the determination of 4-CBA and p-TOL in PTA. The major benefits of CE are speed, simplicity, reduced reagent consumption, and operating costs.

Subcomité:

D16.02

Referida por:

D7976-14R20, D8062-23

Volúmen:

06.04

Número ICS:

71.080.40 (Organic acids)

Palabras clave:

capillary electrophoresis; purified terephthalic acid; 4-carboxybenzaldehyde; p-toluic acid; reverse voltage;