Study On Complexation Reaction Of BF₃·Anisole

The conversion rate of anisole and the stability of complexation reaction of BF3·anisole play a key role in steady and effective operation of the whole boron isotope separation system.A mathematical model for recombiner was established to simulate the reactive process,then the simulative results were compared with the experimental results,and influencing factors that affect reactive process was also studied.A cold-flow model experiment was carried out in a glass tower with inner diameter of 50 mm,packed height of 1m,and an external jacket.?3×3 Dixon rings were used as packings,and N2 and aqueous ethylene glycol solution（10% and 20% in volume）were applied to test the overall heat transfer coefficient.The effects of gas flow rate,liquid flow rate and liquid viscosity on the heat transfer coefficient were analyzed.The correlation between modified Nusselt number and fluid Reynolds number and Prandtl number,was regressed by MATLAB programming,that isN_u=0.01695 Re_L^1.1172Re_G^-0.3358Pr_L^0.7187One dimensional mathematical model was established.The overall heat transfer coefficient was calculated by the fitted correlation.The reaction was simulated by using MATLAB programming to study the effects of anisole flow rate and its inlet temperature,coolant flow rate and its temperature on the reaction temperature and conversion.The simulated results showed: with anisole flowing down,the reaction temperature increases rapidly,then decreases slowly,and finally approaches the temperature of coolant;conversion rate of anisole increases rapidly,the increment speed decreases,finally approaches the limit value under the temperature of coolant;the maximum temperature increases with flow rate and inlet temperature of anisole and the temperature of coolant,but decreases with flow rate of coolant;the maximum conversion rate of anisole is only affected by temperature of coolant.Experiments were carried out to investigate the influence of anisole flow rate and the temperature of coolant on reaction temperature distribution in the designed reactor.The results showed that the coherence between experiment data and simulated result trend,therefore,this model can provide some directions for the control of the recombiner.