Numerical Simulation of Mixing in Complex Reaction System via Computational Fluid Dynamics
Journal Title: Science Paper Online - Year 2006, Vol 1, Issue 1
Abstract
Mixing is one of the most commonly used and most important unit operations in chemical industry. The mixing process is one of the most important factors which will have a deep impact on the yield, selectivity of the fast reaction system, especially when there are competing reactions existed or mixing is the restriction process during the operation. The diazo coupling between 1-naphthol and diazotized sulfanilic acid at room temperature and pH 10 was used to study the influence of mixing on the product distribution of fast, competitive-consecutive reactions. With the CFD software CFX5.6, numerical simulation of a whole semi-batch operation process in a stirred tank reactor was conducted. The relationship between yield and time was simulatied and it was found that, it is especially effective to enhance the overall yield by intensifying the mixing during the earlier period. Various operation parameters such as stirring speed, addition position, and blade position were analyzed to establish their relationship with the yield of the reaction system. It was found that, for the reaction system we worked on, the impact of the stirring speed and blade position is not as obvious as that of the addition position. The latter one is the key parameter which will affect the mixing process and consequently impact the selectivity and yield of the process.
Authors and Affiliations
Hao Xu , Yundong Wang
Keywords
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