METHOD OF DETERMINING WEIGHT PORTION OF WATER IN CRUDE OIL AND RESIDUAL DISTILLATION PRODUCTS BY MEASURING DIELECTRIC PERMITTIVITY AT DIFFERENT FREQUENCIES Russian patent published in 2002 - IPC

FIELD: analytical methods in oil industry. SUBSTANCE: invention relates to analytical technology of rapid determination of water and oils (mixtures of oils) and residual distillation products and can be used in different areas for analysis of a large number of combustive-lubricating materials and a series of heavy organics. In particular, at temperature from 0 to 100 C and higher, from difference of dielectric permittivities measured at frequencies 1 kHz and 1 MHz, one finds, for a given oil, value of dielectric permittivity corresponding to anhydrous oil at 20 C and calculates weight portion of water from the following formula: , where Δε_e = ε_t-ε₂₀°_C-m₁•(20-t) is increase in dielectric permittivity at low frequency and temperature t^°C caused level of water in oil; concentration coefficient at temperature t k_ε,t = k_ε,20+m₂•(20-t), where k_ε,20 is concentration coefficient at 20 C; ε_t,ε₂₀°_C are dielectric permittivities at low frequency for test oil at t^°C and for anhydrous oil at 20 C; and m₁,m₂ denote temperature coefficients. EFFECT: enabled rapid determination of water in oil during oil production, transportation, storage, and processing without performing chemical analyses. 2 ex