Design And Control Of Process For N-butyl Acetate

As an important chemical raw material, n-butyl acetate is widely used in industrial production. Its price is high and the market demand is very large, the traditional batch production cannot meet the growing demand for the chemical industry. Therefore, the development of new energy-saving design of a continuous production process has very important significance.This paper mainly design and research the process of n-butyl acetate systematically. Instead of the traditional concentrated sulfuric acid, a new exchange resin amberlyst-15 as a catalyst. C hoosing the appropriate kinetic equation, using NRTL-HOC thermodynamic model which is appropriate for strong non- ideal system simulate the whole process of n-butyl acetate by RadFrac module of Aspen Plus software. Then, inferred capital consumption and production costs associated with the change of plate numbers by rigorous calculation and the relational economic accounting basis. Regarding the total annual cost as the objective function, it has a economic optimization for the steady-state simulation, the purity of n-butyl acetate is 99.8 %.Though the sensitivity criterion analysis, the third tray is the sensitive plate for the first column C1, the twenty fourth tray is the sensitive plate for the second column C2, and then use the Aspen Dynamics for dynamic simulation of n-butyl acetate. In order to examine its performance, we can observe the changes of the purity and the temperature of the sensitive tray, when setting different control structure and introduce interference of feed flow and feed component. Four different dynamic control structures(CS1-CS4) are established for this process. The anti-jamming capability of CS1 component control structure is week and has poor dynamic response. With the temperature controller replace the component controller, the effect is very obvious after changing CS1. The last three temperature control structures control temperature of the sensitive trays steady, the purity of the product is unlikely fluctuations. The control structure of CS4 is a progressive step improvement of the temperature controller, which is proposed using a plurality of multiplier cascade, the control performance has improved significantly, and quickly returned to the stable values with small fluctuations, so that the purity of n-butyl acetate is higher. It is controlled well within a certain error range.