Control of the rectification column to ensure the required quality of the top product

Abstract

Based on the solution of the mathematical description of the static mode operation in the distillation column, the concentration and temperature profiles along the height of the column were obtained, and the positions of the control plates were determined by calculating their gradients. The sequence of solving the material balance equations is determined under the assumption of the ideal mixing of the liquid on the control plate in the dynamic mode by the method of piecewise linear approximation. A reflux consuming control scheme has been developed according to the condition of minimum deviation time on the control plate of the current concentration value (xt) at each time interval t from its set value. This in turn makes it possible to anticipate changes in the concentration in the distillation for the time of a transport disturbance in the interval “control plate-top of the column” to provide the required quality of the top product.