Method for Determination of Ethanol Content in Methanol

Abstract

The invention provides a determination method of an alcohol content in methanol. The determination method comprises the steps of determining peak area of a standard sample by a gas chromatographic method, drawing a standard curve, determining peak area of a sample to be determined under the same condition as determination of the standard sample, and obtaining an alcohol mass fraction in methanol in the standard curve according to the obtained peak area of the sample to be determined. According to the method, the sample is separated by an Rtx-WAX-Max capillary column, so that methanol is separated from alcohol, and alcohol replaces isopropanol as an internal standard substance, so that the toxicity of a reagent is reduced. The method solves the problem that the existing national standard is only applicable to macroanalysis, and the trace alcohol content in methanol cannot be determined accurately since a byproduct isopropanol in methanol is superposed with an internal standard substance in the standard. The method has the advantages that the method achieves thorough separation, can accurately determine the trace alcohol content in methanol, is convenient and quick to operate and wide in application scope, and facilitates analyzer health, environmental protection and the like.

Description

technical field [0001] The invention relates to a measuring method, in particular to a measuring method for ethanol content in methanol, and belongs to the technical field of analysis and testing. Background technique [0002] Ethanol is a by-product of the methanol production process. Although the content of ethanol in methanol is small, it is a harmful component. High ethanol content in methanol will affect the quality of methanol. Therefore, ethanol content measurement data is an important indicator of methanol product production. However, in the prior art, because the national standard for the determination of ethanol content in methanol uses packed columns for separation, this method can only be used for constant analysis, and the trace amount of ethanol in methanol cannot be accurately measured. At the same time, methanol contains a certain amount of by-product isopropyl Alcohol, using isopropanol as the internal standard in the standard, and isopropanol is a slightly...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of complex analytical methods and inaccurate quantitative methods in the prior art, the present invention provides a method for measuring ethanol content in methanol

Images