Solvent extraction method for treating DMAC wastewater is to utilize the high selectivity and high solubility of the extractant to DMAC to transfer DMAC from the aqueous phase to the organic phase to achieve separation and enrichment. Centrifugal extractor is a key equipment to achieve fast and efficient two-phase mixing and separation.
DMAC Wastewater Treatment Process
- Wastewater pretreatment
Remove impurities that may interfere with the extraction process (such as suspended matter, oils, high concentrations of salt, other organic solvents, etc.) and adjust the pH value (usually DMAC extraction works better under neutral to weakly alkaline conditions). - Solvent extraction
Feed: Pretreated DMAC-containing wastewater (aqueous phase) and selected extractant (organic phase) are pumped into the centrifugal extractor separately or mixed in a certain ratio (O/A) and continuously.
Mixing: In the mixing chamber, the high-speed rotating rotor generates a strong shear force, which fully mixes the aqueous phase and the organic phase. During this process, DMAC quickly diffuses from the aqueous phase and dissolves into the extractant phase.
Separation: The mixed liquid quickly enters the separation zone under the action of the centrifugal field. Due to the density difference between the two phases, under the strong centrifugal force, the heavy phase is thrown to the drum wall, and the light phase gathers in the center of the drum.
Discharge: The separated two phases are discharged continuously and clearly through the independent light phase weir and heavy phase weir. The DMAC content in the aqueous phase (raffinate) after extraction is greatly reduced, usually meeting the standards for discharge or further biochemical treatment. - Extractant regeneration (stripping)
DMAC is recovered from the loaded organic phase, and the extractant is regenerated and recycled to the extraction section to reduce operating costs. - DMAC recovery
The DMAC in the stripping solution is concentrated and purified to achieve resource recovery.
Tiei Extraction CWL-M Centrifugal Extractor
Centrifugal extractor is widely used in the chemical and environmental protection industries, mainly in extraction, water washing, acid washing, alkali washing and other operation sections. Centrifugal extractormainly relies on centrifugal force for rapid mixing and separation, with fast mixing and mass transfer speed, high extraction efficiency, simple and convenient operation, large processing capacity and low power consumption. They are widely used in extraction and separation operation units in many fields.
The use of solvent extraction combined with centrifugal extractor to treat DMAC wastewater is an advanced technology that is efficient, fast, continuous, compact and can achieve resource recovery. Its core advantage lies in the super strong mixing and fast separation ability brought by the centrifugal extractor, which overcomes many shortcomings of traditional extraction equipment and is particularly suitable for treating organic solvent wastewater with high recovery value such as DMAC. This process can not only effectively reduce wastewater pollution, but also recover valuable DMAC products, with good environmental and economic benefits.
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