The quality of the main fluorene cut is a direct factor that affects the quality and yield of industrial fluorene. The main fraction of fluorene mainly contains dibenzofuran, fluorene, 1-methyloxyfluorene and 2-methyloxyfluorene. Except for fluorene, the content of other substances is the main factor affecting the quality of fluorene. Dibenzofuran is not easy to be washed away during the washing and crystallization process, so it should be removed by distillation. Practice has proved that the content of dibenzofuran in the initial stage of fluorene cutting is controlled below 5%, which can ensure that the content of dibenzofuran in the finished fluorene is less than 1%; 1-methyloxyfluorene and 2-methyloxyfluorene are mainly removed by washing.
