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

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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

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
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Example Embodiment

[0043] Example 1

[0044] 1. Configuration of solvent and test solution

[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 of 36.5%), control the temperature of the water bath at 95℃, reflux for 4h, and then stand for 0.5h, then change the back distillation device As a distillation device, discard the first 3 mL distillate and the last remaining 5 mL yellow solution, and only collect the middle distillate. After receiving the front distillate, a new receiving bottle must be replaced to collect the middle distillate. During the distillation process, the temperature is maintained at 86°C so that the distillate can be distilled out at a uniform 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 analytica...

Example Embodiment

[0070] Example 2

[0071] 1. Configuration of solvent and test solution

[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 of 36.5%), control the temperature of the water bath at 95℃, reflux for 4h, and then stand for 0.5h, then change the back distillation device As a distillation device, discard the first 15mL distillate and the last remaining about 5mL yellow solution, and only collect the middle distillate. After receiving the front distillate, a new receiving bottle must be replaced to collect the middle distillate. During the distillation process, the temperature is maintained at 86°C so that the distillate can be distilled out at a uniform 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 o...

Example Embodiment

[0097] Example 3

[0098] 1. Configuration of solvent and test solution

[0099] 1.1 Preparation of carbonyl-free methanol solution

[0100] Measure 1000mL methanol, add 5g 2,4-dinitrophenylhydrazine and 10 drops of hydrochloric acid (mass fraction of 36.5%), control the temperature of the water bath at 95℃, reflux for 4h, and then stand for 0.5h, then change the back distillation device to Distillation device, discard the initially distilled 30mL distillate and the last remaining 50mL yellow solution, and only collect the middle distillate. After receiving the front distillate, a new receiving bottle must be replaced to collect the middle distillate. During the distillation process, the temperature is maintained at 86°C so that the distillate can be distilled out at a uniform 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 o...

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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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