| In the process of separation of boron isotopes of chemical exchange distillation,the adverse reaction is inevitable during BF3-anisole complex pyrolysis. As the deputyreaction product continuous accumulating as an impurity in the system, anisole puritywill continue to decrease and eventually lead to separation efficiency reduce.Therefore, controlling and reducing side reactions and the continuous removal of sideproducts from the system are very important. However, the method of reducing sidereactions and the study on impurity accumulation of anisole recycling areinsufficiency. A new method of reducing the side reaction was proposed in this paperand the impurity accumulation of anisole after recycling was studied.1) Through the study of cracking degree and by-products content at differenttemperatures, optimal cracking temperature was gotten. Subsequent studies on theby-product accumulation as the anisole recycling process were conducted at thesame temperature. The optimal condition of cracking was gotten aftercomprehensive comparison.2) The methods of nitrogen pyrolysis and vacuum pyrolysis was studied which canpromote the pyrolysis effect by taking out the product BF3and then make acomparison with the normal pyrolysis in pyrolysis degree and content. Thismethod can reduce the amount of by-products3) The pyrolysis condensation section is divided into100?and20?intemperature gradient pyrolysis method. By making a comparison of this methodwith the common step pyrolysis in pyrolysis degree and by-product accumulation,this method can increase the cracking degree from60%to100%, anisole contentfrom98.7208to99.4594.4) The relationship between the separation factor and reaction equilibrium constantswas analyzed in this paper and other suitable material as a complexing agent wasfound out. New complexing agent-2-fluoroanisole was selected out: theseparation factor is1.0598higher than1.0389of anisole and the tolerance ofpyrolysis temperature is better than that of anisole. |
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