Study on Distillation Segmentation Containing Fluorene of Washing Oil to Produce 9-fluorenone Using Reaction-separation Method
In order to improve the utilization of fluorene in washing oil,a new reaction-separation method was used to directly prepare 9-fluorenone using model and real distillation segmentation containing fluorene as raw materials respectively.The results showed that,under the optimal conditions(raw material to solvent mass ratio of 1∶7,gas rate of 250 mL/min,catalyst dosage of 5％,reaction temperature of 40 ℃),for model materials,the fluorene could be completely converted to 9-fluorenone within 15 mir..However,for real materials,the reaction rate decreased significantly under the same conditions.The reaction time could be shortened by increasing catalyst dosage.The crude product of 9-fluorenone with a purity greater than 95％could be obtained from the mixture after reaction by distillation method.Combined with recrystallization process,the 9-fluorenone product with a purity greater than 99％could be obtained.Compared with the traditional separation-reaction method,the total yield of 9-fluorenone using this method can increase by nearly 6％.
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维普
