Study On Simulation Of Batch Heterogeneous Azeotropes Distillation

In this paper the current status of phenol production and its use in industry, as well as all kinds of process methods for producing industrial phenol was discussed. The effects on the reactions of different solvents in one process were studied in the toluene-benzoic acid method for producing phenol, based on the result of the former experiment. At the same time, the principle for using benzoic acid produce phenol was discussed.The heavy components waste was studied which was produced by the reaction of the toluene-benzoic acid method for producing phenol,through high vacuum and decompression distillation, and recycled adequately, with highly added value industry products such as benzoic acid, benzyl benzoate and 9-fluorenone etc.In toluene-benzoic acid method for producing phenol process, the main impurity in phenol is water. The refine process of phenol was completed by heterogeneous azeotropic distillation. In this article, toluene is used as entrainer, and phenol, toluene, water system were used as a sample to study a simulation of heterogeneous azeotropic distillation.The azeotropic distillation and the separation technology of batch distillation were summaried. Using a rigorous thermodynamics simulation, an equipoise degree batch distillation model was set up which can be used in both azeotropic distillation and general distillation. This model uses synchro emendation method and abandons the flabby arithmetic which was used in general batch distillation model. This method improves the applicability and accuracy of the model. This structure of this model is mainly based on differential equation, easy to modify with its advantage of readability.The batch distillation was a kind of constant volume holdup model, and can get a constant mole holdup model after predigested. Additionally, according to the reflux condition, this model can be used in both homogeneous and heterogeneous operations.A rigorous initial value was needed in a batch distillation model. In this article, a total reflux model was set up which based on component material balance and total material balance. Simple Arithmetic and high convergence speed were the two advantages of this model. The concept of Minimum entrainer quantity was created using this model for batch azeotropic distillation. When the quantity of entrainer was excessive, the theoretical plates were the least in batch azeotropic distillation, and the minimum entrainer quantity was decreasing with the increasing of theoretical plates. The appropriate arithmetic can be selected in different systems to do its simulative operation through fixing the initial value of batch distillation and using Matlab software to create a dynamic batch distillation model. This article uses phenol, toluene and water system as a sample to simulate. Consequently, the experiment result matched pretty well with that of simulative operation result.