Plotting of the TBP curve with fractional distillation data with consideration of the dynamic errors of the temperature measurement system

A comparison of automatic instruments for oil-product fractional composition determination

“…Minidistillation analyzers use fast detectors, which allows one not to distort the true distillation picture, and that is basically important for developing methods of minidistillation on the basis of mathematical simulation methods [5][6][7].…”

“…Then the temperature determined at the end of boiling in accordance with GOST 2177-99 may actually be higher than the temperature of evaporation for the last drop of liquid. To determine the temperatures at the start and end of boiling by means of a model for gradual distillation [5], an expression is used ν = aτ k /(1 + aτ k ), where ν is the volume fraction of the distillate of the product, and τ is the dimensionless temperature as determined from τ = (T m -T sb )/(T eb -T m ); T sb and T eb are the temperatures of the oil product at the start and end of boiling in the liquid phase, as measured by the minidistillation analyzer (for τ → 0, T → T sb ; for for τ → ∞, T → T eb ); a and k are the parameters of the gradual distillation.…”