FIELD: hydrocarbons.
SUBSTANCE: methods for determining free water in liquid hydrocarbons. The method consists of placing a volume of free water into the cavity of a cylindrical volumetric resonator, exciting an electromagnetic oscillation of type H011, measuring the change in quality factor caused by the presence of free water, characterized in that a dielectric hydrophilic filter in the form of a disk with a base area S0 is placed in the cavity of the cylindrical volumetric resonator radius a so that its axis coincides with the axis of the cylindrical volumetric resonator and at the level h0 from the lower end wall, measure the loaded quality factor Q1, remove this filter from the cavity of the cylindrical volumetric resonator, pass through it the test sample of liquid hydrocarbon with separation on its surface of free water, then this dielectric hydrophilic filter with separated free water is placed in the cavity of a cylindrical volumetric resonator so that its axis coincides with the axis of the cylindrical volumetric resonator and at the level h0 from the lower end wall, the loaded quality factor Q2, the volume of free water is measured evaluated according to the following dependence:
where V6 is the volume of free water; ɛ” is the relative imaginary dielectric constant of water; 
is the filter radius in the form of a disk, J1(…) is the Bessel function of the first kind of the first order, αφ ≤ 1 is the coefficient associated with the properties of a dielectric hydrophilic filter for the spreading of drops of free water on its surface (water-wettable ability), while the degree of porosity of this filter is chosen such as to ensure the separation of free water from the test sample of liquid hydrocarbon, the disk of the dielectric hydrophilic filter is made with a radius b ≤ a.
EFFECT: expanding the range of parameters being determined without reducing the requirements for accuracy and reproducibility of the results obtained, as well as in simplifying the control technique.
1 cl, 6 dwg, 3 tbl
