Measuring method for furfuraldehyde content of mixed solvent

A technology of mixed solvent and determination method, applied in the field of determination of furfural content in mixed solvent, can solve problems such as affecting the quality of mixed solvent, affecting use, etc., and achieves the effects of small error, reduced measurement error, and fast and accurate measurement

Inactive Publication Date: 2014-04-16
TIANJIN ZHAOXIN ELECTRIC MATERIAL SCI & TECH
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Problems solved by technology

If the determination method is inappropriate, it will seriously affect the quality of the mixed solvent, and even affect its use.

Method used

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  • Measuring method for furfuraldehyde content of mixed solvent
  • Measuring method for furfuraldehyde content of mixed solvent
  • Measuring method for furfuraldehyde content of mixed solvent

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Embodiment Construction

[0026] The technical scheme of the present invention is: a method for determining the content of furfural in a mixed solvent, using the hydrochloric acid hydroxylamine oximation method to react furfural with hydroxylamine hydrochloride ethanol solution, wherein bromophenol blue is used as an indicator, and under the best conditions , the solution after the reaction is dropped into the sodium hydroxide standard solution, and the color of the solution is compared with the standard color (the color of the original hydroxylamine hydrochloride ethanol solution). When the color of the two solutions is the same, it can be calculated by the volume of the sodium hydroxide standard solution The percentage by weight of furfural is suitable for mixed solvents in which other components except furfural do not react with hydroxylamine hydrochloride in the mixed solvent. The chemical reaction formula is:

[0027]

[0028] 1. instrument

[0029] General laboratory equipment and instrum...

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Abstract

The invention provides a measuring method for the furfuraldehyde content of a mixed solvent. The method comprises the following steps: (1) weighing 1-2 grams of furfuraldehyde sample according to a mass decrement method; (2) putting the weighed furfuraldehyde sample into an iodine flask in which 30 mL of oxammonium hydrochloride alcohol solution is added; screwing the cork and shaking up; placing for 15 minutes (holding temperature of 20-25 DEG C) for sufficient reaction; (3) titrating sodium hydroxide standard solution of 0.25 mol / L with a blue line leather head burette to a standard color (the color of the original oxammonium hydrochloride alcohol solution); (4) refilling a drop of an indicator when the sodium hydroxide standard solution approaches to the titration end point in order to observe the titration end point conveniently; (5) calculating weight percentage composition of the furfuraldehyde W (%). The measuring method has the benefits as follows: the bromophenol blue indicator is selected; through observation of the colors of the solution, volume of the sodium hydroxide standard solution which is needed to drop in is calculated; the furfuraldehyde content of the mixed solvent can be obtained simply and conveniently by utilizing calculation formulas; error is relatively small.

Description

[0001] technical field [0002] The invention belongs to the technical field of solvent analysis, in particular to a method for determining furfural content in a mixed solvent. Background technique [0003] In the prior art, before using the mixed solvent, it is necessary to measure the furfural content in the mixed solvent. If the determination method is not appropriate, it will seriously affect the quality of the mixed solvent, and even affect its use. Contents of the invention [0004] The purpose of the present invention is to provide a kind of assay method of furfural content in mixed solvent, and this method can be simple, fast and accurate, is applicable to the mixed solvent that except furfural, other components do not react with hydroxylamine hydrochloride in mixed solvent. [0005] The technical scheme of the present invention is: a kind of assay method of furfural content in the mixed solvent, adopt hydrochloric acid hydrochloride oximation method, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
Inventor 庞恩勇丁毅李振庆王润生
Owner TIANJIN ZHAOXIN ELECTRIC MATERIAL SCI & TECH
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