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ASTM D7976-14

(Specification)

Standard Specification for Purified Terephthalic Acid (PTA)

Standard Specification for Purified Terephthalic Acid (PTA)

ABSTRACT
This specification establishes requirements for purified terephthalic acid (PTA) used in the manufacturing of polymers, including the production of polyesters for fiber, filament, yarn, film, coating, bottle and resin applications. For purposes of determining conformance with this specification, an observed value or a calculated value shall be rounded off to the nearest unit in the last right-hand digit used in expressing the specification limit. This specification covers properties and sampling of the material.
SCOPE
1.1 This specification covers purified terephthalic acid (PTA) for use in the manufacturing of polymers. Some examples include the production of polyesters for fiber, filament, yarn, film, coating, bottle and resin applications.  
1.2 The following applies to all specified limits in this specification: for purposes of determining conformance with this specification, an observed value or a calculated value shall be rounded off to the nearest unit in the last right-hand digit used in expressing the specification limit, 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 Consult current OSHA regulations, supplier’s Safety Data Sheets, and local regulations for all materials used in this specification.  
1.5 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.

General Information

Status
Historical
Publication Date
30-Nov-2014
ICS
71.080.40 - Organic acids
Technical Committee
D16 - Aromatic, Industrial, Specialty and Related Chemicals
Drafting Committee
D16.02 - Oxygenated Aromatics
Current Stage
Ref Project

Relations

Replaced By
ASTM D7976-14(2020) - Standard Specification for Purified Terephthalic Acid (PTA)
Effective Date
01-Feb-2020

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ASTM D7976-14 - Standard Specification for Purified Terephthalic Acid (PTA)ASTM D7976-14 - Standard Specification for Purified Terephthalic Acid (PTA)
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ASTM D7976-14 - Standard Specification for Purified Terephthalic Acid (PTA)
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7976 −14
Standard Specification for
1
Purified Terephthalic Acid (PTA)
This standard is issued under the fixed designation D7976; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D7882 Test Method for Determination of
4-Carboxybenzaldehyde and p-Toluic Acid in Purified
1.1 This specification covers purified terephthalic acid
Terephthalic Acid by Capillary Electrophoresis with Nor-
(PTA) for use in the manufacturing of polymers. Some
mal Voltage Mode
examples include the production of polyesters for fiber,
D7883 Test Method for Determination of
filament, yarn, film, coating, bottle and resin applications.
4-Carboxybenzaldehyde and p-Toluic Acid in Purified
1.2 The following applies to all specified limits in this
TerephthalicAcid by WeakAnion Exchange High Perfor-
specification: for purposes of determining conformance with
mance Liquid Chromatography
this specification, an observed value or a calculated value shall
D7884 Test Method for Determination of
be rounded off to the nearest unit in the last right-hand digit
4-Carboxybenzaldehyde and p-Toluic Acid in Purified
used in expressing the specification limit, in accordance with
Terephthalic Acid by Reverse Phase High Performance
the rounding-off method of Practice E29.
Liquid Chromatography
1.3 The values stated in SI units are to be regarded as E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
standard. No other units of measurement are included in this
standard. E300 Practice for Sampling Industrial Chemicals
2.2 Other Documents:
1.4 Consult current OSHA regulations, supplier’s Safety
OSHA Regulations, CFR 29 paragraphs 1910.1000 and
Data Sheets, and local regulations for all materials used in this
3
1910.1200
specification.
1.5 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
3.1 Definitions:
responsibility of the user of this standard to establish appro-
3.1.1 purified terephthalic acid, n—(C H O ) molecular
8 6 4
priate safety and health practices and determine the applica-
weight, 166.13; white crystalline solid or powder; sublimes,
bility of regulatory limitations prior to use.
402 to 404°C; abbreviated as PTA (CAS #100-21-0).
2. Referenced Documents 3.1.2 4-carboxybenzaldehyde, n—(C H O ) molecular
8 6 3
weight, 150.13; white to yellow crystalline solid or powder;
2
2.1 ASTM Standards:
melting point, 247°C; abbreviated as 4-CBA(CAS #619-66-9).
D7881 Test Method for Determination of
3.1.3 p-toluic acid, n—(C H O ) molecular weight, 136.15;
4-Carboxybenzaldehyde and p-Toluic Acid in Purified
8 8 2
white crystalline solid or
...

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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.  
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SCOPE
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SCOPE
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SIGNIFICANCE AND USE
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ABSTRACT
This specification establishes requirements for purified terephthalic acid (PTA) used in the manufacturing of polymers, including the production of polyesters for fiber, filament, yarn, film, coating, bottle and resin applications. For purposes of determining conformance with this specification, an observed value or a calculated value shall be rounded off to the nearest unit in the last right-hand digit used in expressing the specification limit. This specification covers properties and sampling of the material.
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4.1 The presence of metals in PTA used for the production of polyester is undesirable because they may speed up or slow down the reaction and be impurities in the final product.  
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SCOPE
1.1 This test method covers the determination of metal elements in purified terephthalic acid (PTA) by inductively coupled plasma atomic emission spectrometry (ICP-AES).This method is applicable to PTA samples containing sodium, chromium, cobalt, aluminum, titanium, potassium, magnesium, manganese, iron, nickel, molybdenum and calcium over 0.055 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, 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.

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