Coal chemical industry is a vital part of the chemical industry, its production process such as coal gasification, coal coking and coal liquefaction, etc., produce a lot of wastewater, which contains a variety of toxic substances, high degradation difficulty, direct treatment is very difficult. Common treatment methods include chemical method, physicochemical method, biochemical method and solvent extraction method. Among them, solvent extraction has excellent performance in dephenolization, which can achieve more than 90% to 95% dephenolization effect. With its high efficiency and stable performance, the combined extraction centrifugal extractor has shown great application potential in the treatment of coal chemical wastewater, especially in the process of dephenolization.

** 1. Application of combined extraction centrifugal extractor in the treatment of phenol ammonia wastewater **

The phenol ammonia wastewater of an enterprise has "four high" characteristics, such as high COD, high ammonia nitrogen, high volatile phenol and high chroma. Faced with such complex waste water components, the combined extraction centrifugal extractor plays a key role. Firstly, the oil and suspended matter in the wastewater are removed through the process of oil removal and slagging. Then enter the ammonia distillation tower to remove ammonia nitrogen; Then enter the dephenolization process to remove phenolic substances; Finally, it enters the post-treatment process to ensure that the effluent quality meets the standard.

In the process of dephenolization, the multi-stage countercurrent solvent extraction technology is used, including 5-stage centrifugal extraction and 3-stage centrifugal reverse extraction. In this process, with its high separation factor and excellent separation effect, the volatile phenol content in the wastewater is reduced to less than 150mg/L and the petroleum content is less than 50mg/L, which fully meets the requirements of the subsequent process. Importantly, the extractant can be recycled after recycling, which greatly reduces the operating cost and improves the resource utilization rate.

Second, the technical advantages of the combined extraction centrifugal extractor help the field of coal chemical industry

The combined extraction centrifugal extractor not only has excellent performance in the treatment of phenolamine wastewater, but also has extensive application potential in other wastewater treatment processes in the field of coal chemical industry. Through a series of innovative structural design and efficient centrifugal separation principle, the combined extraction centrifugal extractor can solve a variety of complex wastewater treatment problems, the following are its key technical advantages:

1. ** Efficient separation performance ** : Through its high-speed rotation and strong centrifugal force, the combined extraction centrifugal extractor can achieve efficient substance separation, making the extraction process more rapid and accurate, especially in the remarkable effect of dephenolization treatment.

2. ** Multi-stage series design ** : multi-stage series countercurrent operation greatly improves the separation efficiency and product purity, and is suitable for complex chemical separation and wastewater treatment processes to ensure that the effluent quality meets strict environmental standards.

3. ** Green ** : Low power consumption design and recycling of extractants make the combined extraction centrifugal extractor not only efficient, but also more environmentally friendly. The extractant can be recycled many times and the waste of resources is reduced.

4. Economical and efficient: The design of the equipment takes into account the optimization of input costs, simple operation and maintenance, which greatly reduces the operating costs of enterprises, making it an ideal choice for coal chemical enterprises to improve efficiency and reduce environmental pressure.

Through the application of combined extraction centrifugal extractor, the wastewater treatment process in the field of coal chemical industry has been significantly optimized, and the production efficiency and treatment effect have been greatly improved. Its characteristics of high efficiency, automation and environmental protection make it an ideal choice for wastewater treatment in the field of coal chemical industry, and provide strong support for the sustainable development of the industry. The combined extraction centrifugal extractor not only performs well in dephenolization treatment, but also shows extensive application potential in other complex wastewater treatment and chemical substance separation.