Method for separating phenol compound in phenol-containing wastewater

Abstract

The invention discloses a method for separating a phenol compound in phenol-containing wastewater. The method sequentially comprises the following steps: (1) wastewater pretreatment; (2) extraction: mixing a compound extraction agent containing butyl butyrate and citronellol in a volume ratio of (9-10) to 1 with phenol-containing wastewater treated in the step (1) in a volume ratio of 1 to (1-4), stirring at 10-50 DEG C for 1-2 hours, and standing for 1-2 hours, so as to obtain an extraction phase and an extraction raffinate phase; (3) separation: separating a lower extraction raffinate layer and an upper extraction layer from a solution obtained after standing in the step (2); (4) recycling of an extraction agent: carrying out reduced pressure distillation on the extraction phase in the step (3), so as to obtain a dephenolization extraction agent and a coarse powder product, wherein the dephenolization extraction agent is used for circularly extracting high-concentration phenol-containing wastewater; and (5) final treatment. By virtue of the method, the phenol compound with a purity of 99% can be prepared; and furthermore, the extraction agent is environment-friendly, the residual volume of the extraction agent in water is extremely low, and the standardized discharge and recycling of wastewater are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of water treatment, relates to a method for treating phenol-containing wastewater, and specifically discloses a method for separating phenolic compounds in the phenol-containing wastewater. Background technique [0002] Phenol and its derivatives are the most common water pollutants in industrial processes. Phenols are difficult to degrade and are toxic. Wastewater containing only a small amount of phenol will cause irreversible harm to humans, aquatic organisms and crops if it is discharged arbitrarily without treatment. Phenol can cause damage to human nerves, liver, and kidneys. Fish living in water bodies containing 0.1-0.2 mg / L of phenol will have a phenolic smell. Higher concentrations will cause a large number of fish to die. Wastewater (phenol content 50-100mg / L) irrigates farmland, which will cause crops to decrease or even die. Phenolic compounds are widely used in the chemical industry and are im...

AI Technical Summary

Problems solved by technology

[0007] In view of the shortcomings of the above-mentioned high-concentration volatile phenol-containing wastewater extraction technology, in order to effectively solve the problem of using extraction agents to extract and dephenolize phenol-containing wastewater in the prior art, the reagents may be inefficient and toxic or easily cause secondary pollution, and the energy consumption of solvent recovery High, large loss, high operating costs and other problems, the present invention provides an efficient and economical method for extracting phenol-containing wastewater, which improves the removal efficiency of volatile phenols, reduces the loss of solvents, and makes the dephenolization wastewater reach The primary emission standard stipulated by the city