GB/T 30921.3-2016 English PDF

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GB/T 30921.3-2016: Test method of purified terephthalic acid (PTA) for industrial use -- Part 3: Determination of water content
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 30921.3-2016	119	Add to Cart	3 days	Test method of purified terephthalic acid (PTA) for industrial use -- Part 3: Determination of water content	Valid

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Basic data

Standard ID: GB/T 30921.3-2016 (GB/T30921.3-2016)
Description (Translated English): Test method of purified terephthalic acid (PTA) for industrial use -- Part 3: Determination of water content
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G16
Classification of International Standard: 71.080.40
Word Count Estimation: 6,621
Date of Issue: 2016-06-14
Date of Implementation: 2017-01-01
Quoted Standard: GB/T 3723; GB/T 6283; GB/T 6679; GB/T 6682; GB/T 8170
Regulation (derived from): National Standard Announcement No. 8 of 2016
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the Karl Fischer volumetric method and the thermogravimetric method for the determination of water content in industrial fine terephthalic acid (PTA). The standard Karl Fischer volumetric method is applicable to the determination of water content in industrial PTA of not less than 0.010% (mass fraction); the thermal weight loss method is suitable for industrial PTA content of not less than 0.050% (mass fraction) of water.

GB/T 30921.3-2016: Test method of purified terephthalic acid (PTA) for industrial use -- Part 3: Determination of water content

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Test method of purified terephthalic acid (PTA) for industrial use.Part 3. Determination of water content ICS 71.080.40 G16 National Standards of People's Republic of China Test method for industrial terephthalic acid (PTA) Part 3. determination of water content Testmethodofpurifiedterephthalicacid (PTA) forindustrialuse- Part 3. Determination ofwatercontent 2016-06-14 release 2017-01-01 Implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released

Foreword

GB/T 30921 "Industrial terephthalic acid (PTA) test method" is divided into the following parts. - Part 1. Determination of p-carboxybenzaldehyde (4-CBA) and p-methylbenzoic acid (p-TOL) - Part 2. Determination of metal content; - Part 3. Determination of water content; - Part 4. Determination of titanium content - Diantipyrylmethane spectrophotometric method; - Part 5. Determination of acid value; - Part 6. Determination of particle size distribution; - Part 7. Determination of b * values - Chromatic aberration method. This part is Part 3 of GB/T 30921. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part is proposed by China Petroleum & Chemical Corporation. This section is under the jurisdiction of the National Chemical Standardization Technical Committee (SAC/TC63). This part of the drafting unit. Sinopec Yangzi Petrochemical Co., Ltd. This part of the main drafters. Song Kui, Ding Daxi. Test method for industrial terephthalic acid (PTA) Part 3. determination of water content WARNING. This method is not intended to describe all safety issues related to its use. It is the user's responsibility to take appropriate safety and health Kang measures, and to ensure compliance with the relevant provisions of national laws and regulations.

1 Scope

This part of GB/T 30921 specifies the Karl Fischer volumetric method for the determination of water content in industrial terephthalic acid (PTA) and heat Weight loss method. This part of the Karl Fischer volumetric method for industrial PTA content of not less than 0.010% (mass fraction) of the determination of moisture; heat Weight loss method for industrial PTA content of not less than 0.050% (mass fraction) of the determination of moisture.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. General rules for sampling safety of industrial chemical products GB/T 3723 GB/T 6283 Determination of moisture content in chemical products Karl Fischer method (general method) General rules for sampling of solid chemical products GB/T GB/T 6682 Analytical laboratory water specifications and test methods Representation and Judgment of Numerical Correction Rule and Limit Value of GB/T 8170

3 Karl Fischer volumetric method

3.1 Method Summary The PTA sample was dissolved in pyridine, and the water present in the sample was mixed with a known titer of the Karl Fischer reagent (iodine, sulfur dioxide, pyridine Pyridine and methanol) to calculate the water content of the sample based on the consumed Karl Fischer reagent. The reaction is as follows. H2O I2 SO2 3C5H5N → 2C5H5N · HI C5H5N · SO3 C5H5N · SO3 CH3OH → C5H5N · HSO4CH3 3.2 Reagents and Materials 3.2.1 Unless otherwise specified, the reagents used are analytical pure, experimental water in line with GB/T 6682 in the three water requirements. 3.2.2 Karl Fischer Reagent. commercially available (containing pyridine), titer of 1mg/mL ~ 3mg/mL or 3mg/mL ~ 6mg/mL; GB/T 6283. 3.2.3 Pyridine. water content of less than 0.05% (mass fraction). If the water content is greater than 0.05%, add 500 points to 500 mL of pyridine Sub-screen about 50g, plug the stopper, placed overnight, learn the use of supernatant. Warning. Pyridine is toxic, has a strong irritant, can be inhaled, ingested, absorbed by the skin. Should be used in a fume hood and worn with a precaution Pyridine infiltrated gloves. ......

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