In the presence of acetic acid and polyethylene glycol, chromic anhydride and acenaphthene react under mild condition and acenaphthene can completely convert into acenaphthenone.

在酸、聚乙二醇存在下 ,铬酸酐和在温和条件下反应 ,可以完全转化为酮。

The improvement of the purity of fluorene is not dependent on the removal of acenaphthene and dibenzofuran, but dependent on the separation of other impurities.

纯度提高主要不是依赖、去除,而是其它杂质分离。