Searching And Scheduling Strategies For Operation Path Of Batch Separation System

Distillation is the most popular separation method used in the chemical process industries. It is accomplished mainly by taking advantage of the volatility difference between light and heavy key components. Azeotropes with a high degree of thermodynamic complexity which involves gas-liquid-liquid equilibrium and distillation boundary, it is clearly impossible to break down the azeotropes in a single ordinary distillation operation, and the process of distillation, points and mixed contains many work units, forming a large combinatorial optimization problem. Optimal Integration of Azeotropic Distillation System is a challenging problem which is urgent to solve. Recent years, as the development and application of fine chemicals, batch distillation suitable for small, diverse operating flexibility was also much accounted.In this paper, both synthesis and scheduling issues were studied. Based on the principle of triangle thermodynamics first phase diagram are classified, and then based on the unit operation of the relationship between the sequence define all feasible operation. Clearing block materials and feasible operations, based on rules that intuitive operation feasible path, Then the logical relationship reasoning to integer programming model to solve the optimal operation path. And its operation path in the triangle phase diagram of the expressions.A novel method for optimally integrating the flow sheet of an azeotropic distillation system is proposed based on the logical relationship of Petri Nets structure. Firstly, according to the concepts of Petri Nets the unit operation topology modules were established, i.e., distillation, decantation and mixing modules; Then, the superstructure of the azeotropic distillation system which embed all the feasible flow sheets was built up to generate Petri Nets correlation matrix, and thereby the corresponding state equation was constructed, and an objective function was set up with the consideration of minimizing the number of operation units. Then optimal feasible flow sheets of azeotrope separation were derived by resorting to solving0-1integer linear programming. In order to better guide industry, this paper also studies the material balance calculations were based on the systematic procedure boiling distillation method to verify the correctness of the logical solution. This article explains how to seek optimal scheduling of azeotropic distillation system based on mathematical programming then. Because of boiling distillation system to the path of the separation effect is not the only one, in addition, we noticed, continuous distillation flow chart can be converted into batch process work-state network diagram, therefore, According to optimal feasible flow sheets, a Mixed Integer Linear Programming Model (MILP) is constructed for generating the optimal schedule. Develop a set of integration process and scheduling of boiling distillation system of design procedure.Proposed method has fewer variables and constraints, it is easy to program and solving time is short. The implementation procedure is demonstrated with several case studies, with the case study, the correctness and effectiveness of the model and algorithm proposed are illustrated.