Wastewater containing phenol, as the main by-product in the production and use of phenol, is widely derived from pesticide, insecticide, dye, medicine and other industrial production fields. As an indispensable raw material for organic chemical synthesis in these industries, phenol's wide application has promoted the development of related industries, but it has also brought severe environmental challenges - the generation of a large amount of wastewater containing phenol. Effective treatment and recovery of phenol in these wastewater is of great significance for resource recycling and environmental protection.

In the process of treating wastewater containing phenol and recovering phenol, extraction technology has become the first choice due to its high efficiency and economy. According to the different extraction mechanisms, commonly used extractants can be divided into physical extractants and complex extractants, such as N-503, cyclohexane, methyl isobutyl ketone (MIBK), tri-butyl phosphate (TBP) and the rise of new HC extractants (such as HC-3 and HC-4) in recent years. These extractants can efficiently extract phenol from wastewater by physical dissolution or chemical reaction.

The combined extraction centrifugal extractor, as an advanced liquid-liquid extraction separation equipment, plays a key role in the process of phenol extraction from phenol containing wastewater. The equipment uses powerful centrifugal force field to accelerate the mass transfer process between extractant and wastewater and promote the efficient separation of phenol. The specific process flow is as follows:

Wastewater pretreatment: Firstly, wastewater containing phenol is pretreated to remove impurities such as suspended matter and large particulate matter in order to improve the subsequent extraction efficiency.

Extractant selection: According to the characteristics of wastewater and treatment requirements, select the appropriate extractant, such as N-503, MIBK or HC new extractant.

Combined extraction centrifugal extraction: the pretreatment wastewater and extractant are simultaneously or separately added to the combined extraction centrifugal extraction machine, and the rapid transfer of phenol from the wastewater to the extractant is realized by the effect of centrifugal force field. The extraction rate of phenol could be further improved by multistage countercurrent extraction.

Phase separation and collection: Under the action of centrifugal force, the extraction phase and the wastewater phase are naturally stratified and discharged from their respective outlets. The extraction phase is rich in phenol, which can be further treated and recovered. The phenol content in the wastewater phase was greatly reduced, which reached the discharge standard or could be recycled.

Extractant regeneration and recycling: For renewable extractants, they can be recycled by appropriate methods (such as distillation, reverse extraction, etc.) to achieve recycling and reduce production costs.

The combined extraction centrifugal extractor shows excellent performance and advantages in the process of phenol extraction from phenol containing wastewater, which not only improves the extraction efficiency of phenol, but also helps to realize the resource utilization of wastewater and environmental protection.