A method and application of measuring methanol relative correction factor in methoxymethanol without standard sample

A technology of methoxymethanol and correction factor, applied in the field of gas chromatography detection, can solve the problems of unstable methoxymethanol, difficulty in purchasing standard samples, inability to measure correction factor, etc., and achieve the effects of accurate results and simple operation.

Active Publication Date: 2021-08-17
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Description
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Problems solved by technology

This substance can go out peak on gas chromatography, and chromatogram sees attached figure 1 : The conventional quantitative method is to prepare a standard sample and determine its relative correction factor to accurately quantify (that is, the methanol in it can be accurately quantified), but methoxymethanol itself is unstable, and it is difficult to purchase a standard sample and cannot pass conventional method to determine its correction factor

Method used

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  • A method and application of measuring methanol relative correction factor in methoxymethanol without standard sample
  • A method and application of measuring methanol relative correction factor in methoxymethanol without standard sample
  • A method and application of measuring methanol relative correction factor in methoxymethanol without standard sample

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example 1

[0032] Take methanol-stabilized concentrated formaldehyde (containing water, methanol, and methoxymethanol), add isopropanol, mix well, and inject samples on a weakly polar chromatographic column HP-5 and an FID detector to determine methanol, isopropanol, and isopropanol. The area-normalized content of propanol and methoxymethanol; add sodium sulfite to the solution, mix well and inject the sample again, and record the area-normalized content of methanol, isopropanol and methoxymethanol; add sodium sulfite again, mix well Afterwards, the sample was injected again, and the area-normalized content of methanol, isopropanol and methoxymethanol was recorded. The experimental results and calculation results are shown in Table 1: because the solution contains traces of other impurities, the sum of the contents of the three is not 100%. The contents of the three were normalized; due to the difference in the response factors of methanol in methoxymethanol and free methanol, the normali...

example 2

[0037]Take methanol-stabilized concentrated formaldehyde (containing water, methanol, and methoxymethanol), add ethanol, mix well, inject samples on a highly polar chromatographic column INNOWAX, and FID detector, and record methanol, ethanol, and methoxyl The area-normalized content of methanol; add sodium sulfite to the solution, mix well and inject again, and record the area-normally content of methanol, ethanol, and methoxymethanol; add sodium sulfite again, mix well and inject again, record methanol, The area-normalized content of ethanol and methoxymethanol, the experimental results and calculation results are shown in Table 2: Since the solution contains a small amount of other impurities, the sum of the contents of the three is not 100%, and the contents of the three are normalized; Due to the difference in the response factors of methanol in methoxymethanol and free methanol, there is a difference in the normalized content of ethanol. After adding sodium sulfite, the c...

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Abstract

The invention discloses a method for measuring the relative correction factor of methanol in methoxymethanol without a standard sample. Methoxymethanol is a product of equimolar condensation of methanol and formaldehyde. The formaldehyde in methoxymethanol is used to react with the reagent to release methanol in methoxymethanol. The ratio of the reduction is the correction factor for methanol in methoxymethanol relative to free methanol. During the analysis process, adding a reference reagent is convenient for area normalization determination. After the response standard of the reference reagent is finally unified, the content of methanol and methoxymethanol after calibration under different reaction reagent additions is plotted, and linear fitting is performed. Then the relative correction factor for methanol in methoxymethanol was obtained. Using this method, the methanol content in methoxymethanol can be accurately determined without a standard sample. This method has the advantages of simple operation and accurate results.

Description

technical field [0001] The invention belongs to the field of gas chromatography detection, in particular to a method and application for measuring the relative correction factor of methanol in methoxymethanol without a standard sample. Background technique [0002] After concentration, formaldehyde is unstable and easy to polymerize. Methanol is usually added as a stabilizer. After adding methanol, methanol and formaldehyde tend to condense in equimolar form to form methoxymethanol and consume methanol. This substance can go out peak on gas chromatography, and chromatogram sees attached figure 1 : The conventional quantitative method is to prepare a standard sample and determine its relative correction factor to accurately quantify (that is, the methanol in it can be accurately quantified), but methoxymethanol itself is unstable, and it is difficult to purchase a standard sample and cannot pass conventional methods to determine its correction factor. Contents of the inven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/86
CPCG01N30/02G01N30/06G01N30/8631G01N30/8665G01N2030/067
Inventor 贾绘如王光永谌晓玲王莉陈晓华周拥华
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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