H-acid, as a key naphthalene dye intermediate, plays an important role in the production of acid dyes, reactive dyes, and pharmaceutical synthesis. During its production process, sulfuric acid or hydrochloric acid is often used in the acidification step to precipitate H-acid monosodium salt. After filtration, the remaining waste mother liquor is characterized by a high concentration of organic matter, strong acidity, high salinity, and deep color. It is a typical example of highly polluted, poorly biodegradable industrial wastewater, which can cause severe environmental damage if discharged directly.

Through repeated experiments and engineering practice, the extraction method has been proven to be an efficient approach for treating H-acid wastewater. This process is particularly suitable for organic wastewater with high chemical oxygen demand (CODCr), poor biodegradability, and strong biotoxicity. In this field, Zhengzhou Tiei Extraction Co., Ltd. has demonstrated significant advantages with its advanced centrifugal extraction technology and integrated treatment solutions.

H-Acid Wastewater Extraction Treatment Process

Extraction Stage
In the extraction stage, a complexation extraction process combined with a two-stage cross-current extraction method is employed. The pH of the H-acid wastewater is first adjusted, and then a specific extractant and wastewater are fed into the Tiei Extraction centrifugal extractor at an optimized ratio. Inside the equipment, the two phases are intensely sheared and mixed, achieving thorough mass transfer. Under the action of strong centrifugal force, the naphthalenesulfonic acid organic components in the wastewater are then rapidly and completely separated.

Stripping Stage
The stripping process adopts a single-stage cross-current operation. The high-concentration stripping solution efficiently separated by the Tiei extraction equipment can be directed to subsequent units for further concentration and utilized in the production of naphthalene-based water-reducing agents and other by-products, thereby achieving both resource recovery and environmental benefits.

Core Advantages of Zhengzhou Tiei Extraction’s Centrifugal Extraction Technology

Efficient Mass Transfer and Rapid Phase Separation
The Centrifugal Extractor utilizes powerful centrifugal force to enable thorough mixing and mass transfer between the extractant and wastewater within an extremely short time. This ensures rapid and complete phase separation, significantly improving treatment efficiency and overcoming the long residence time and low efficiency issues commonly associated with traditional extraction equipment.

Corrosion Resistance and High Reliability
Considering the strong corrosive nature of H-acid wastewater, the key components of Tiei extraction equipment can be manufactured from special alloys or composite materials. This design ensures long-term stable operation under harsh conditions and greatly extends the service life of the equipment.

Continuous Operation and Automated Control
The entire system is designed for fully continuous and sealed operation. It can be easily integrated into existing production lines and supports automated control, thereby reducing manual labor intensity and human error while ensuring stable effluent quality.

Low Extractant Loss and Cost-Effective Operation
The precise separation performance effectively minimizes the entrainment loss of extractant in the aqueous phase. Meanwhile, the efficient recovery system enables the extractant to be recycled and reused, thereby reducing overall operating costs and enhancing the economic efficiency of the process.

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Email: sales@tieiextraction.com
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