As a basic chemical raw material, acetic acid has always faced technical challenges in the treatment of wastewater generated during its production and use. In response to the problem of equipment for treating acetic acid wastewater with different concentrations, the multi-stage countercurrent extraction process of the CWL-M centrifugal extractor developed and produced by Zhengzhou Tiei Extraction Technology Co., Ltd. has achieved efficient recovery of acetic acid and standard treatment of wastewater.

In terms of separation technology, although the traditional distillation method is theoretically feasible, it has the problem of high energy consumption for dilute acetic acid solution (<5%). Experimental data show that when treating 2.5% acetic acid wastewater, the energy consumption of the distillation method is 3.2 times that of the extraction method. In contrast, the tributyl phosphate (TBP) extraction system used has significant advantages: under optimized conditions (pH=3.5-4.0, temperature 25-30℃), the single-stage extraction efficiency can reach more than 85%.

The technological breakthroughs of Tiei Extraction CWL-M centrifugal extraction system are mainly reflected in three aspects: 1. Through multi-stage countercurrent design, the total extraction rate is improved to meet customer requirements; 2. The innovative centrifugal mass transfer structure reduces the ratio (O/A) to the standard and reduces the solvent consumption compared with traditional mixer settler; 3. The modular design realizes the flexible adjustment of processing capacity.
An application case of a chemical enterprise shows that when treating 2.5% acetic acid wastewater, the acetic acid concentration in the raffinate phase drops to 0.07%, and the acetic acid recovery rate reaches 97.5%, saving RMB 1.8 million in annual treatment costs.

The environmental benefits of this system are also significant: the fully enclosed design reduces VOCs emissions; the automated control system (PLC+SCADA) enables unattended operation; and the loss rate of the extractant is reduced. These innovations make this technology particularly suitable for the treatment of acetic acid wastewater in the pharmaceutical and pesticide industries, providing a new technical paradigm for the resource utilization of chemical wastewater. Future research will focus on the development of new extractants to further enhance the system's adaptability to wastewater with complex components.

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