Abstract
From the viewpoint of film theory, mass transfer in liquid-phase molecular distillation is considered. The fol lowing results were obtained. 1) Evaporation rate (N) is given as shown in the following equation.
N=1/(1+ψγβB/D) C0ψγβ
where B is thickness of stagnant surface film; C is concentration of liquid; D is diffusion coefficient;β is maximum evaporation rate;γ is conversion factor;φ is evaporation coefficient. 2) 1/(1+φγβB/D) is defined as film coefficient of evaporation rate (E). E is increased as the liquid surface temperature is lowered. 3) Film coefficient of mass transfer is proportional to E0.45.
