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ASTM Standards help determine impurities in PTA.

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December 11, 2013 - Purified terephthalic acid, commonly known as PTA, is a major raw material for polymer and plastic manufacture used in making polyester fiber, resin, and film. Four new ASTM International standards will be used to determine the presence of the impurities 4-Caraboxybenzaldehyde and p-Toluic Acid in PTA. These newly approved standards will be used to set specifications and as internal quality control tools for both users and manufacturers.

ASTM Aromatic Hydrocarbons Committee Develops Standards for Determining Presence of Impurities in Purified Terephthalic Acid


ASTM International
100 Barr Harbor Dr., Box C700
West Conshohocken, PA, 19428-2959
USA



Press release date: December 2, 2013

W. CONSHOHOCKEN, Pa., —Purified terephthalic acid, commonly known as PTA, is a major raw material for polymer and plastic manufacture used in making polyester fiber, resin and film. Four new ASTM International standards will be used to determine the presence of the impurities 4-Caraboxybenzaldehyde and p-Toluic Acid in PTA. The four new standards were developed by Subcommittee D16.02 on Oxygenated Aromatics, part of ASTM International Committee D16 on Aromatic Hydrocarbons and Related Chemicals.

The four newly approved standards are:

ASTM D7881, Test Method for Determination of 4-Caraboxybenzaldehyde and p-Toluic Acid in
Purified Terephthalic Acid by High Performance Capillary Electrophoresis with Reverse Voltage Mode;

ASTM D7882, Test Method for Determination of 4-Caraboxybenzaldehyde and p-Toluic Acid in
Purified Terephthalic Acid by High Performance Capillary Electrophoresis with Normal Voltage Mode;

ASTM D7883, Test Method for Determination of 4-Caraboxybenzaldehyde and p-Toluic Acid in Purified Terephthalic Acid by Weak Anion Exchange High Performance Liquid Chromatography; and

ASTM D7884, Test Method for Determination of 4-Caraboxybenzaldehyde and p-Toluic Acid in Purified Terephthalic Acid by Reverse Phase High Performance Liquid Chromatography.

“The presence of 4-CBA and p-TOL in PTA is undesirable because they can slow down the polymerization process,” says Yuhong Zhang, technical specialist, China Petrochemical Corp., and chairman of D16.02. “Also, 4-CBA imparts coloration to the polymer due to thermal instability. However, there have been no international standards for PTA until now.”

Zhang notes that determination and quantification of 4-CBA and p-TOL in PTA is often required by manufacturers. These newly approved standards will be used to set specifications and as internal quality control tools for both users and manufacturers. In addition, laboratories and regulatory bodies such as customs agencies might use the standards for PTA trading and quality supervision and inspection.

“The four new PTA test methods will be used by PTA producers worldwide for quality control and inspection,” says Zhang. “The global adoption of the standards will facilitate world trade and diminish technical barriers for PTA products.”

To purchase ASTM standards, visit www.astm.org and search by the standard designation, or contact ASTM Customer Relations (phone: 877-909-ASTM; sales@astm.org). ASTM International welcomes participation in the development of its standards. For more information on becoming an ASTM member, visit www.astm.org/JOIN.

ASTM International is one of the largest international standards development and delivery systems in the world. ASTM International meets the World Trade Organization (WTO) principles for the development of international standards: coherence, consensus, development dimension, effectiveness, impartiality, openness, relevance and transparency. ASTM standards are accepted and used in research and development, product testing, quality systems and commercial transactions.

For more news in this sector, visit www.astm.org/sn-chemicals or follow us on Twitter @ASTMChemicals.

ASTM Committee D16 Next Meeting: Jan. 29-30, 2014, January Committee Week, Houston, Texas
Technical Contact: Yuhong Zhang, China Petrochemical Corp., Shanghai, China, Phone: 86-21-6846-2281; Zhang-yh10@163.com
ASTM Staff Contact: Kristy Straiton, Phone: 610-832-9640; kstraiton@astm.org  
ASTM PR Contact: Barbara Schindler, Phone: 610-832-9603; bschindl@astm.org
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