Liquid chromatograph for determining diesel hydrocarbon composition and FAME (fatty acid methyl ester) content as well as determination method and application of liquid chromatograph

Abstract

The invention relates to a liquid chromatograph for determining diesel hydrocarbon composition and FAME (fatty acid methyl ester) content as well as a determination method and an application of the liquid chromatograph and belongs to the field of diesel analysis and detection. The liquid chromatograph comprises a sample injection pump, a sample injector, a six-way valve, a first liquid chromatographic column, a second liquid chromatographic column and a refractive index detector, wherein the sample injection pump is connected with the sample injector, and the liquid chromatograph has a first state for liquid feeding and a second state for detection by rotating the six-way valve. The liquid chromatograph is simple in structure and higher in automation degree and can determine hydrocarbon composition and the FAME content of diesel fuel containing biodiesel and diesel simultaneously. The determination method comprises steps as follows: the liquid chromatograph is used for separating and detecting a to-be-determined sample, and an external standard method is adopted for quantification. The method is simple and rapid and good in condition controllability, is used for determining dieselfuel containing or not containing biodiesel and petroleum fractions with the distillation range at the temperature of 150-400 DEG C and is high in accuracy of detection results.

Description

technical field [0001] The invention relates to the field of analysis and detection of diesel oil, and in particular to a liquid chromatograph for determining the hydrocarbon composition of diesel oil and the content of fatty acid methyl ester, its determination method and application. Background technique [0002] The content of polycyclic aromatic hydrocarbons in diesel oil is one of the control indicators stipulated in diesel oil standards, and its content needs to be accurately determined. However, the addition of biodiesel (fatty acid methyl ester) has brought great challenges to the current determination standards of polycyclic aromatic hydrocarbons. [0003] At present, there are three methods for determining the content of polycyclic aromatic hydrocarbons in diesel oil. One method is SH / T 0806-2008 "Determination of Aromatic Hydrocarbon Content in Middle Distillates by Differential Refractive Detector High Performance Liquid Chromatography". However, this method is n...

AI Technical Summary

Problems solved by technology

However, this method has many disadvantages: 1. This method requires manual pre-separation of diesel oil, and the solid-phase extraction column used in the pre-separation is a disposable consumable, resulting in high cost of single analysis; 2. The pre-separation operation steps are cumbersome and require Volatile and toxic organic solvents are harmful to operators and the environment. Moreover, for special samples, the initial separation is not easy to meet the method requirements; 3. For diesel fuel containing biodiesel, it is necessary to add a series of The operation steps make the whole method more cumbersome and time-consuming, and also increase the error of the method

Images