Abstract
Methanol and acetonitrile form a minimum azeotrope at 336.74 K, which contains methanol 76.89 mas%. The simulation and the experiment to separate the mixture by batch extractive distillation using aniline as entrainer is performed. Based on the experimental and simulative VLE data, aniline is chosen to be the suitable solvent. The sensitivity analysis about the number of stages, the refl ux ratio, the solvent feed stage and the solvent fl ow rate is conducted to obtain the optimal parameters and confi guration of the extractive distillation column with minimal energy requirements. The most appropriate confi guration is 30 theoretical stages. The optimal entrainer feeding stage is 8 with a solvent fl ow rate of 20kg/h and the refl ux ratio of 2.0, respectively. The simulation results show the effect of the main variables on the extractive distillation process. The experiment is carried out to corroborate the feasibility of the separation of methanol-acetonitrile by batch extractive distillation.
Highlights
Batch distillation (BD) has always been an important part of seasonal, uncertain or low capacity and high-purity chemicals’ production
Basic steps of the batch extractive distillation (BED) A complete BED process consists of the following basic steps17: 1. Operation under the total reflux without solvent feeding
It is observed in the figure that the solvent is an effective agent and methanol with a high purity can be obtained in the top of distillation column
Summary
Batch distillation (BD) has always been an important part of seasonal, uncertain or low capacity and high-purity chemicals’ production. It is a process of key importance in the pharmaceutical and several other industries and in the regeneration of waste solvent mixtures. The separation is done by introducing a selectively acting third component, the extractive distillation solvent namely the solvent, with the result that the relative volatility of the mixture to be separated is increased and azeotropes, if present, are overcome[4,5,6,7,8]. The simulation for the separation of methanol- acetonitrile azeotropic mixture is carried out to select the suitable solvent and obtain the optimal parameters for batch extractive distillation. The results are compared with that procured via experiments
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