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Standard Test Method for Determination of 4-Carboxybenzaldehyde and p-Toluic Acid in Purified Terephthalic Acid by Capillary Electrophoresis with Reverse Voltage Mode (Includes all amendments and changes 2/24/2021).Translate name
STANDARD published on 1.10.2020
Designation standards: ASTM D7881-20e1
Publication date standards: 1.10.2020
The number of pages: 8
Approximate weight : 24 g (0.05 lbs)
Country: American technical standard
Category: Technical standards ASTM
capillary electrophoresis, purified terephthalic acid, 4-carboxybenzaldehyde, p-toluic acid, reverse voltage,, ICS Number Code 71.080.40 (Organic acids)
|Significance and Use
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 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.
1.1?This test method1.2?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 .
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.
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.
|2. Referenced Documents
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