The extraction and refining process includes distillating washing oil or anthraceneoil to get fluorene distillate, then crystallizing the fluorene distillate to get fluorene using cooling or solvent.
In Estonia three types of shale tar have been used as alternatives to anthraceneoil or carbolineum.
在爱沙尼亚，已有三种页岩焦油用作蒽油或氯化蒽油的替换物。
3
The new process for refined anthracene and refined carbazole extracted from anthraceneoil is described, the problems to be cared in installation and production of equipment are analyzed.