In the process of fluorene extraction and purification, industrial fluorene is generally obtained by separating the tar washing fraction or anthracene oil fraction of coal tar by batch distillation, and then refining industrial fluorene by crystallization. Obtain fine fluorene with higher purity. Due to the increasing demand for fine fluorene in the market and the increasingly strict quality requirements, the crystallization process for the preparation of fine fluorene has attracted the attention of researchers at home and abroad.
