关键词: 反应精馏隔壁塔, 酯交换反应, TAC, 优化, 动态仿真, 控制

Abstract:

This paper focuses on the simulation, optimization and control of the reactive dividing wall column for the production of n-butyl acetate through ester exchange reaction. The optimal operating conditions are obtained with the minimum total annual cost(TAC) as the target function. Different matching relationships between manipulate variables and control variables are determined through the sensitive analysis of steady state relative gain and the Relative Gain Array(RGA) criterion, and then three control structures are built in Aspen Dynamics. It shows that the use of the reactant feed ratio to control the stage temperature is effective to handle the feed disturbances, which presents superior ability in maintaining stability of this system. At last, an improved control structure(CS3) is proposed, which deletes the ratio of reboiler duty and mixture feed rate and shows a great advantage in reducing overshoot of product purities. The specific control structure of CS3 is as follows: the reboiler load of reactive distillation column controls the temperature of the 16th plate of the reactive distillation column directly; ratio of feed rate for n-butanol and methyl acetate/methanol mixture controls the temperature of 28th plate of the reactive distillation column; and the reboiler load of stripping column controls that of the 3rd plate of stripping column directly.

Key words: reactive dividing wall column, transesterification, TAC, optimization, dynamic simulation, control