Process for producing industrial fluorene by coal tar wash oil

Abstract

The invention relates to a process for producing industrial fluorene by coal tar wash oil, which produces the industrial fluorene by taking heavy washing oil obtained by removing naphthalene, methylnaphthalene, dimethylnaphthalene, acenaphthene, and the like from coal tar washing oil as raw materials, and is characterized in that the heaving washing oil is taken as raw materials, and a continuousrectification method is adopted to extract fluorene fraction which is used for producing the qualified industrial fluorene and fluorene rich residual oil through processes of solvent crystallization or cooling crystallization, solvent reclamation, recrystallization and squeezing separation (or processes of washing, crystallization and solvent reclamation); and the residual oil is returned to the raw materials of the continuous rectification process. The process is suitable for a large-scale coal tar washing oil processing device, has high automation level of the continuous rectification process, and realizes the extraction of the fluorene fraction through once rectification of the heavy washing oil. The process has the advantages of simple operation, easy control and regulation, stable acquired fraction quality, low power consumption, high production efficiency and the like; and the fluorene rich residual oil is returned to the raw materials of the continuous rectification, so the yield of an industrial fluorene product can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of coal tar processing, in particular to a process for producing industrial fluorene from coal tar washing oil. Background technique [0002] The typical process for the production of industrial fluorene from the existing coal tar washing oil is shown in the attached figure 1 Shown: The heavy wash oil after removing components such as naphthalene, methylnaphthalene, dimethylnaphthalene, and acenaphthene from coal tar wash oil is used as raw material, heated in batch distillation kettle 101, and the gas phase enters batch distillation tower 102, and the tower The top oil gas enters the reflux tank 104 after being condensed by the condenser 103, and part of the distillate flows from the reflux tank to the top of the distillation tower 102 for reflux, and the rest enters the separation tank 105, and the residual oil at the bottom of the still is sent out. The initial fraction entering the separation tank 105 is sent out...

AI Technical Summary

Problems solved by technology

Generally, the batch distillation process has the disadvantages of small production scale, difficult operation, low automation level, and high power consumption.

The separation efficiency of the recrystallization method with xylene as a solvent is low. The qualified industrial fluorene crystals obtained in the above process only account for a small part of the fluorene fractions from the distillation still. Most of the fluorene remains in the residual oil and cannot be extracted. Industrial The yield of fluorene products is low, the residual oil contains high fluorene, and the economic benefit is poor

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