This test method covers the determination of the 4-carboxybenzaldehyde (4-CBA) and p-Toluic acid (p-TOL) in purified terephthalic acid (PTA) by high performance capillary electrophoresis with reverse voltage mode
The presence of 4-CBA and p-TOL in PTA product needs to be well controlled since the two impurities may affect the polycondensation of terephthalic acid and ethylene glycol. The HPCE method with Reverse Voltage mode will be adopted by PTA producers and customers for quality control and PTA trade.
Keywords4-carboxybenzaldehyde (4-CBA);p-Toluic acid (p-TOL);purified terephthalic acid (PTA);high performance capillary electrophoresis(HPCE)reverse voltage mode
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Ballot Item Approved as D7881-2013 and Pending Publication