METHOD OF DETERMINING DIETHYLENE GLYCOL MONOMETHYL ETHER IN DIESEL FUEL Russian patent published in 2020 - IPC G01N33/22 C07C43/13 

FIELD: monitoring and measuring equipment.

SUBSTANCE: present invention relates to a laboratory method for determining the quantitative content of detergent additive AC 900G (based on diethylene glycol monomethyl ether (MEDEG)) in diesel fuel by gas chromatography using a system of two columns and a blowdown system, including at first step introduction of a diesel fuel sample containing diethylene glycol monomethyl ether, using a carrier gas stream from the gas chromatograph injector with carrier gas initial pressure into first non-polar capillary column with stationary phase from polydimethylsiloxane to direct first effluent into second polar capillary column with fixed phase from polyethylene glycol modified with nitroterephthalic acid, at the second step, separating the flow leaving the first nonpolar capillary column into a heavy hydrocarbon fraction stream and a light hydrocarbon fraction stream containing diethylene glycol monomethyl ether, by means of the blowback system by an additional stream of carrier gas by increasing the pressure of the additional carrier gas stream supplied through the back blowdown system with simultaneous reduction of the initial pressure to the first column, and conducting a separated stream of light fraction through a second polar capillary column with a fixed phase from polyethylene glycol, modified with nitroterephthalic acid, with provision of return of flow of heavy fraction of hydrocarbons in reverse side through first non-polar capillary column with fixed phase from polydimethylsiloxane; at the third stage passing of the flow of light fraction of hydrocarbon containing monomethyl ether of diethylene glycol passing through the second polar capillary column through a detector and determination of amount of diethylene glycol monomethyl ether.

EFFECT: disclosed is a laboratory method for determining the quantitative content of detergent additive AC 900G in diesel fuel.

14 cl, 2 dwg, 4 tbl, 1 ex