(422f) Process Intensification Using Annular Centrifugal Extractor for Highly Exothermic Multi-Phase Di-Nitration Reaction
In the present work the ACE is being utilized as a reactor and an inline separator in a single device. Reaction is performed for different mol ratio (1:1 - 1:3.5 Reactant to nitric acid), phase ratio (10:90 - 90:10 nitric acid to reactant), rotation speeds and throughput (2 - 20 ml/min). The result obtained were compared with the reaction in tubular flow reactor as well as conventional batch reactor. Economic and safety implications were discussed for the scale up of the selected exothermic di-nitration reaction.
Initially, Hydrodynamics parameters (pressure drop, residence time distribution, heat transfer coefficient and mass transfer coefficient) of the ACE was determined for the different throughput and phase ratio by using model fluid Water and Ethylene dichloride (EDC). EDC is also used as solvent in the reaction. Extraction efficiency was measured for range of parameters selected above. Reaction was performed for the optimized parameter with high extraction efficiency at given throughput.
Due to high shear generated in the mixing zone and very good separation efficiency of ACE it can act as a very good reactor and separator. For the case of two-phase reactions where efficient mixing is required at particularly high throughput ACE can serve the purpose better. Highly exothermic multiphase di-nitration reaction chosen here require very good mixing to achieve good yields. The high separation efficiency of ACE can be utilized for the separation of two phases after reaction which can eliminate the use of different separator.
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