Method of quickly measuring content of terephthalic acid

A technique for rapid determination of terephthalic acid, applied in the field of chemical analysis, to achieve the effect of shortening the analysis time, simple, fast and accurate operation, and expanding the test range

Inactive Publication Date: 2018-06-29
常州市五洲化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is also no method for measuring terephthalic acid content with a wide range

Method used

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  • Method of quickly measuring content of terephthalic acid
  • Method of quickly measuring content of terephthalic acid
  • Method of quickly measuring content of terephthalic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Test the analytically pure AR of Guohua Reagent respectively with the method for measuring the acid value of purified terephthalic acid in the petrochemical industry standard "SH / T 1612.2-1995" and the method of the present invention's "Rapid Determination of Terephthalic Acid Content". A sample of phthalic acid.

[0022] The specific steps for the determination of the acid value of industrial purified terephthalic acid in the petrochemical industry standard "SH / T 1612.2-1995" are as follows:

[0023] Weigh about 1.0g of the sample to be tested (accurate to 0.0001g) into a 250mL Erlenmeyer flask. Add 20 mL of pyridine to the Erlenmeyer flask, stir until the PTA is basically dissolved, then add 20 mL of boiled and cooled distilled water, and continue stirring until the sample is completely dissolved. Add 0.1 mL of phenolphthalein indicator solution. Titrate with sodium hydroxide standard titration solution until it turns pink, and record the volume of standard titratio...

Embodiment 2

[0045] Use the method of "Rapid Determination of Terephthalic Acid Content" to determine the content of terephthalic acid in the terephthalic acid waste residue provided by Wujiang Aifeihua Textile Trading Co., Ltd. This sample is a tide product. The specific steps are as follows:

[0046] A. Accurately weigh about 2.0g of sample, accurate to 0.0001g, put it in a 250mL conical flask, add 1 drop of Span 80 (about 0.045g), add 20mL of water, shake well, sonicate until uniform, add 3 drops Phenolphthalein indicator solution, titrated with sodium hydroxide standard solution until the solution turns pink and keeps 30s without fading, which is the end point. The calculation method is the same as the calculation formula of the quick method in Example 1.

[0047] B. Accurately weigh about 3.0g of sample, accurate to 0.0001g, put it in a 250mL conical flask, add 2 drops of AEO-9 (about 0.09g), add 20mL of water, shake well, sonicate until uniform, add 3 drops Phenolphthalein indicator...

Embodiment 3

[0051]Use the method of "Quick Determination of Terephthalic Acid Content" to determine the content of terephthalic acid in the terephthalic acid waste residue provided by Yixing China Resources Materials Co., Ltd. This sample is a tide product. The specific steps are as follows:

[0052] D. Accurately weigh about 4.0g sample, accurate to 0.0001g, put it in a 250mL Erlenmeyer flask, add 1 drop of Tween 80 and 1 drop of Span 80, add 40mL of water, shake well, sonicate until uniform, add 3 Drop phenolphthalein indicator solution, titrate with sodium hydroxide standard solution until the solution turns pink, and keep it for 30s without fading, which is the end point. The calculation method is the same as the calculation formula of the fast method in Example 1.

[0053] E. Accurately weigh about 3.0g sample, accurate to 0.0001g, put it in a 250mL Erlenmeyer flask, add 1 drop of AEO-9 and 1 drop of OP-10, add 30mL of water, shake well, sonicate until uniform, add 3 Drop phenolphth...

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Abstract

The invention provides a method of quickly measuring content of terephthalic acid, which includes steps of: weighing a certain amount of a to-be-tested sample and placing the sample in a 250 mL conical flask, adding a certain amount of a nonionic surfactant and a proper amount of water, shaking the conical flask, performing ultrasonic treatment to uniformity, adding a phenolphthalein indicator solution, and performing titration with a NaOH standard solution until the solution has a pink color, wherein when the color of the solution is stable for 30 s, the system reaches titration terminal. Themethod is low in cost, has simple and quick operation, is accurate, is toxic-free and harmless when compared with conventional methods, and is enlarged in measurement range.

Description

technical field [0001] The invention relates to the field of chemical analysis, in particular to a method for rapidly determining the content of terephthalic acid. Background technique [0002] PTA is the English abbreviation of purified terephthalic acid. It is a white powder crystal at room temperature. It is non-toxic and flammable. If it is mixed with air, it will burn within a certain limit when exposed to fire. [0003] PTA is the lower-end product of petroleum. Petroleum produces naphtha through a certain process, and then extracts mixed xylene from naphtha, and then extracts p-xylene. PTA uses p-xylene as raw material, acetic acid as solvent, and is oxidized by air under the action of a catalyst to generate crude terephthalic acid. Then, the crude terephthalic acid is hydrogenated and refined to remove impurities, and then crystallized, separated, and dried to obtain a refined terephthalic acid product, that is, a finished PTA product. In addition, there are many d...

Claims

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Application Information

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IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 蒋丽张海燕张莉娜
Owner 常州市五洲化工有限公司
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