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

Abstract

The invention discloses a standard colorimetric method for carbonyl compound content in industrial methanol, and belongs to the field of industrial methanol. The method comprises the following steps:preparing a series of standard solutions with different carbonyl compound contents, reacting the standard solutions with 2, 4dinitrophenylhydrazine and potassium hydroxide in sequence under certain conditions, and observing to find that the color is gradually changed from faint yellow to dark red brown along with the gradual increase of the carbonyl compound contents; preparing a standard colorimetric card according to the color of the standard solution, the volume part mass number of the carbonyl compound content, the methanol grade and other information; after the sample is completely reacted under the same condition, comparing the sample with a standard colorimetric card, finding out the closest color, and directly reading out information such as the content of the carbonyl compound andthe grade of a methanol sample. Quantitative calculation of the content of the carbonyl compound can be achieved. The determination method has the characteristics of intuition, rapidness, simplicity,convenience, low requirements on detection equipment, instruments, places and the like.

Description

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

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.

Images