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Detection method of phenol or aniline compound coupling value

An aniline compound and detection method technology, which is applied in the direction of chemical analysis by titration method, can solve the problems of large error in detection method and difficult operation, and achieves the effects of small detection error, simple operation and few raw materials.

Inactive Publication Date: 2018-06-29
DONGYING ANNUOQI TEXTILE MATERIALS +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is that the existing detection method of coupling value of phenolic or aniline compounds has defects such as large error and difficult operation, thereby providing a detection method of coupling value of phenolic or aniline compounds

Method used

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  • Detection method of phenol or aniline compound coupling value

Examples

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preparation example Construction

[0045] Preparation of p-nitroaniline diazonium salt solution:

[0046] Weigh 50g of p-nitroaniline into a 250mL brown volumetric flask, add 50mL of distilled water and 12mL of concentrated hydrochloric acid, cool to below 0°C, and add a theoretically calculated amount of 0.5mol / L sodium nitrite standard solution (about 25mL) at one time.

[0047] Keep it below 5°C, use starch potassium iodide test paper to detect the end point is slightly blue, otherwise, continue to add sodium nitrite dropwise until the starch potassium iodide test paper is slightly blue and keep for three minutes without fading, then add water to dilute to the scale and shake well before placing Store in a cold bath of water.

[0048] Preparation of sodium nitrite standard solution:

[0049] Weigh 36g sodium nitrite, 0.5g NaOH and 1g anhydrous Na 2 CO 3 Dissolve in water and dilute to 1000mL.

[0050] Preparation of 2,4-diaminotoluene aqueous solution:

[0051] Weigh 12.2g of 2.4-diaminotoluene and diss...

Embodiment 1

[0056] In this embodiment, the sample to be tested is the esterification solution of yellow palm (the acetic acid solution of N-cyanoethyl-N-acetoxyethylaniline).

[0057]Weigh 0.4639g sample, add 20mL glacial acetic acid, 50mL sodium acetate, 50mL distilled water and cool to below 5°C, add 50mL p-nitroaniline diazonium salt, stir at 0-5°C for 30 minutes, then add 0.1mol / L 2 , Titrate the aqueous solution of 4-diaminotoluene, and do the wet ring test, until the H-acid is colorless, and the p-nitroaniline diazonium salt is yellow.

Embodiment 2-4

[0059] The samples used in Examples 2-4 were 0.4392g, 0.4407g, and 0.4640g respectively, and the rest of the operations and conditions were the same as in Example 1.

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Abstract

The invention discloses a detection method of a phenol or aniline compound coupling value. The detection method comprises the following steps of (1) adding a paranitroaniline diazonium salt aqueous solution into a mixture A to form a mixture B, wherein the mixture A is a phenol or aniline compound sample, acetic acid, sodium acetate and water; (2) adding a 2, 4-diaminotoluene water solution into the mixture B. The detection method provided by the invention has the advantages of simple operation, less detection error, less used raw materials, and application to detection of factory production.

Description

technical field [0001] The invention relates to a method for detecting the coupling value of phenolic or aniline compounds. Background technique [0002] At present, the detection method for the coupling value of phenolic or aniline compounds is to use a jacketed burette and directly titrate the coupling components with a diazonium salt standard sample. Because the diazonium salt is unstable and easy to decompose, the detection error of this detection method is large, and it is difficult to operate when a burette is used with a jacket. Contents of the invention [0003] The technical problem to be solved by the present invention is that existing detection methods for coupling values ​​of phenolic or aniline compounds have defects such as large error and difficult operation, thereby providing a detection method for coupling values ​​of phenolic or aniline compounds. The detection method of the invention has the advantages of simple operation, small detection error and few ...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 龙群芝马莲
Owner DONGYING ANNUOQI TEXTILE MATERIALS
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