Abstract
A problem of mass transfer with an instantaneous irreversible reaction was solved by introducing a concept of negative concentration and sometransformation variables to change the problem of a moving boundary to that of a nonlinear differential equation and using the finite difference method.
The solution thus obtained is in good agreement with that of Sherwood and Pigford in an initial period. In the latter half period, however, the moving velocity of the reaction plane is accelerated and the results deviate from those of Sherwood and Pig ford. The reactant in liquid is exhausted within a finite time.
The movement of the reaction plane is verified from experiments.
