High pressure-driven batch distillation optimal control for methyl acetate-methanol separation

The pressure-swing distillation process with high-pressurized batch columns (HHP), with and or without a recycling stream, for separating methyl acetate-methanol is studied from the aspect of optimal control. The results show that even though not heat integrated, the process using HHP benefits in productivity. Based on the maximum recovery, the dynamic controllability without any kind of heat integration is researched. The proposed process, however, has the economic potential of both capital and energy by internal heat integration, ie. connecting the reboiler of the lower high-pressurized column to the condenser of the higher high-pressurized column. In the future, even more azeotropes, both minimum and/or maximum boilers, should be investigated in order to establish a “heuristic guidance” for HHP design and industrial usage.