System and method for recovering mixed phenol in phenol residual oil

Abstract

The invention relates to a system and a method for recovering mixed phenol in phenol residual oil, the system comprises a raw material feeding unit, a gas heating totally-closed anaerobic cracking reaction unit, a mixed phenol recovery unit and a cooling water supply unit, the raw material feeding unit stores and conveys raw materials to the gas heating totally-closed anaerobic cracking reaction unit; mixed phenol gas produced by the gas heating totally-closed anaerobic cracking reaction unit is introduced into the mixed phenol recovery unit, and the cooling water supply unit provides condensed circulating water for the mixed phenol recovery unit. According to the invention, the phenol residue oil can be treated, phenolic substances in the phenol residue are recovered while environmental protection is met, the recovered mixed phenol is fed into the raw material tank for refining the crude phenol, and then subsequent processing is carried out along with the crude phenol raw material, so that the product recovery rates of phenol, o-cresol, m-cresol, p-cresol and xylenol are increased, the yield of corresponding products is increased, and the production cost is reduced. And certain economic benefits are increased for enterprises, and both environmental protection and economy are achieved.

Description

technical field [0001] The invention relates to the technical field of coking, in particular to a system and method for recovering mixed phenols in phenol residue oil. Background technique [0002] In the coking industry, the recovery of phenol is mainly to use 10% to 12% sodium hydroxide, the distilled fraction of washing tar and the residual ammonia water refined by gas to extract oil, and react with phenolic substances to obtain neutral phenoxide, which is distilled The neutral oil and water are blown off to obtain the net phenate, which is then decomposed and refined with carbon dioxide and sulfuric acid to obtain the intermediate product crude phenol. There are two methods of refining crude phenol, continuous distillation and batch distillation, and finally obtain phenol, o-cresol, m-p-cresol, and xylenol products. No matter which distillation method is used, a part of phenol residue will be produced while obtaining the product. [0003] Phenolic residues contain pheno...

AI Technical Summary

Problems solved by technology

At the present stage, most of the crude phenol refining production plants adopt the plan of removing coal blending. This treatment plan can not meet the requirements of environmental protection, and wastes phenols such as cresol and xylenol in the phenol residue. In view of the current unreasonable phenol slag treatment scheme, there is an urgent need for an environmentally friendly and feasible treatment method

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