The equation for the calculation of a mean size of liquid drops and a kind of a dimensional distribution function of the drops formed at a liquid dispersion in a regular-packed scrubber have been suggested in the present article. The proposed technique is based on the maximum entropy principle (MEP) with use of a dissipative approach. It was established that the distribution of drops according to their sizes in a regular-packed scrubber is described by the Rosin-Rambler equation. The influence of a turbulent gas flow’s energy on a liquid’s dispersion process is taken into consideration by application of the Kolmogorov-Obukhov law. The article contains the comparison of the calculation and experimental results. Despite the application of a number of simplifications at the modelling the experimental data have shown a satisfactory correspondence to the calculated results. The results obtained can be useful at engineering design of chemical apparatuses.