METHOD FOR DETERMINATION OF DIETHYLENE GLYCOL CONCENTRATION IN FIELD DIETHYLENE GLYCOL SOLUTIONS Russian patent published in 2014 - IPC G01N21/3577 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to research of composition and properties of multicomponent hydrocarbon systems in process of oil and gas condensate deposits, and namely to photometric methods for determination of diethylene glycol concentration in saturated (upon moisture absorption from gas) diethylene glycol (sDEG) and recovered diethylene glycol (rDEG). DEG concentration in field diethylene glycol solutions is measured by IR-spectrometric method that includes determination of their optical density and determination of DEG content against pre-plotted calibration dependence of optical density on DEG concentration in the solvent such as diethylene glycol of SOP brand (99.9%), which is also used as a blank sample during calibration and measurements. At that, before measurement of optical density of calibration solvents and the tested sample, preliminary scanning of their spectra is done and wave length corresponding to the maximum signal in the measured spectrum is fixed, while measurement of optical density for the blank, calibration and tested samples are made at wave lengths corresponding to the maximum value of the signal for each sample.

EFFECT: invention allows fast determination of DEG content with high accuracy and without sample treatment.

2 dwg, 1 tbl