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Standard colorimetric method for measuring content of carbonyl compound in industrial methanol

A technology of carbonyl compounds and industrial methanol, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of limited breadth and flexibility, and achieve low requirements, The effect of simple test conditions

Inactive Publication Date: 2012-12-26
宋继增
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above two determination methods require professional instruments and equipment, and at the same time put forward higher requirements for the ability and level of inspectors
Moreover, it is necessary to provide a special inspection site, which greatly limits the breadth and flexibility of the application of these two methods.

Method used

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  • Standard colorimetric method for measuring content of carbonyl compound in industrial methanol
  • Standard colorimetric method for measuring content of carbonyl compound in industrial methanol
  • Standard colorimetric method for measuring content of carbonyl compound in industrial methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1. Solvent and test solution configuration

[0045] 1.1 Preparation of carbonyl-free methanol solution

[0046] Measure 100mL of methanol, add 0.5g of 2,4-dinitrophenylhydrazine and 1 drop of hydrochloric acid (mass fraction: 36.5%), control the temperature of the water bath at 95°C, reflux for 4h, and let stand for 0.5h, then change the back distillation device to As a distillation device, discard the first 3mL of distilled liquid and the last remaining 5mL of yellow solution, and only collect the middle distillate. After receiving the previous fraction, a new receiving bottle must be used to collect the middle fraction. During the distillation process, the temperature is controlled at 86°C so that the distillate can be distilled out at a constant speed. The distillate should be clear, transparent and colorless. Store the collected carbonyl-free methanol in a brown reagent bottle.

[0047] 1.2 Potassium hydroxide-methanol solution

[0048] Weigh 50g of analyticall...

Embodiment 2

[0071] 1. Solvent and test solution configuration

[0072] 1.1 Preparation of carbonyl-free methanol solution

[0073] Measure 500mL of methanol, add 2.5g of 2,4-dinitrophenylhydrazine and 5 drops of hydrochloric acid (mass fraction is 36.5%), control the temperature of the water bath at 95°C, reflux for 4h, and let stand for 0.5h, then change the back distillation device to For distillation equipment, discard the first 15mL of distilled liquid and the last remaining about 5mL of yellow solution, and only collect the middle distillate. After receiving the previous fraction, a new receiving bottle must be used to collect the middle fraction. During the distillation process, the temperature is controlled at 86°C so that the distillate can be distilled out at a constant speed. The distillate should be clear, transparent and colorless. Store the collected carbonyl-free methanol in a brown reagent bottle.

[0074] 1.2 Potassium hydroxide-methanol solution:

[0075] Weigh 100g ...

Embodiment 3

[0098] 1. Solvent and test solution configuration

[0099] 1.1 Preparation of carbonyl-free methanol solution

[0100] Measure 1000mL of methanol, add 5g of 2,4-dinitrophenylhydrazine and 10 drops of hydrochloric acid (mass fraction is 36.5%), control the temperature of the water bath at 95°C, reflux for 4h, and after standing still for 0.5h, change the back distillation device to Distillation device, discard the first 30mL of distilled liquid and the last remaining 50mL of yellow solution, and only collect the middle distillate. After receiving the previous fraction, a new receiving bottle must be used to collect the middle fraction. During the distillation process, the temperature is controlled at 86°C so that the distillate can be distilled out at a constant speed. The distillate should be clear, transparent and colorless. Store the collected carbonyl-free methanol in a brown reagent bottle.

[0101] 1.2 Potassium hydroxide-methanol solution

[0102] Weigh 500g of anal...

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Abstract

The invention discloses a standard colorimetric method for measuring the content of a carbonyl compound in industrial methanol, belonging to the field of industrial methanol. The standard colorimetric method comprises the following steps of: firstly, preparing a series of standard solutions with different contents of the carbonyl compound, reacting with 2,4-dinitrophenylhydrazine and potassium hydroxide under a certain condition, and observing that the color gradually changes from faint yellow to deep red brown with the gradual increase of the content of the carbonyl compound. According to information such as the colors of the standard solutions, volume part mass number of the content of the carbonyl compound, and methanol grade, a standard colorimetric card. A sample completely reacts under the same condition, compared with the standard colorimetric card, a closest color is found, and the information such as content of the carbonyl compound and the methanol sample grade is directly read. The quantitative calculation of the content of the carbonyl compound can be realized. The standard colorimetric method has the characteristics of intuition, rapidness, convenience, low requirements for detection devices, apparatuses and occasions, and the like.

Description

technical field [0001] The invention relates to a standard colorimetric method capable of accurately and quickly measuring the content of carbonyl compounds in industrial methanol, in particular to a fast, direct and simple method for measuring the content of carbonyl compounds in first-line industrial methanol. Background technique [0002] Industrial methanol is a very important basic chemical raw material with huge production and sales volume. Among them, the content of carbonyl compounds is an important basis for judging the quality and grade of industrial methanol. Therefore people have done a lot of research on the determination of the content of carbonyl compounds in industrial methanol, which are widely used: (1) Spectrophotometry: the carbonyl compounds in the sample are mixed with 2,4-dinitrobenzene under certain conditions successively Hydrazine and potassium hydroxide react, and then use a spectrophotometer to measure the absorbance, and finally convert the cont...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 宋继增张杰韩金秀刘鹏
Owner 宋继增
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