In various industrial fields such as chemicals, pharmaceuticals, and dyeing, dimethylformamide (DMF) is widely used as an important organic solvent. However, high-concentration DMF wastewater (with concentrations of 1%–20%) generated during production presents significant treatment challenges due to its complex composition, including heavy metals and salts. Traditional treatment methods often suffer from low efficiency and high costs. Zhengzhou Tiei Extraction Technology Co., Ltd. has developed a specialized solution based on the CWL-M series centrifugal extractor. Through innovative separation technology, this solution enables high-efficiency recovery of DMF while ensuring that the treated wastewater meets discharge standards.
Technological Innovation: Breakthrough Application of the Centrifugal Extraction Process
The similar densities of DMF and water pose significant challenges for conventional separation processes. The CWL-M centrifugal extractor utilizes the principle of centrifugal force to achieve rapid phase separation. Through an optimized mixing structure, the equipment significantly increases the mass-transfer area and improves separation efficiency. Practical application data show that, using a three-stage counter-current extraction process, DMF wastewater with an initial concentration of 15% can be reduced to below 0.5%, with a COD removal rate exceeding 95%.
The system is equipped with an intelligent temperature control unit, operating within a temperature range of 25–75 °C, ensuring that DMF does not decompose during treatment. Its fully enclosed design effectively prevents solvent volatilization, reducing extractant consumption by approximately 30% compared with traditional methods. In a synthetic leather manufacturing plant, this technology successfully treated wastewater with a DMF concentration as high as 18%, consistently achieving an effluent DMF concentration below 0.8%.
Process Flow: An Integrated Resource Recovery System
Tiei Extraction has established a systematic DMF recovery process:
1.Extraction Stage
A high-efficiency extractant is selected, and 2–4 stages of counter-current extraction are carried out using the CWL-M centrifugal extractor to transfer DMF from the aqueous phase to the organic phase. The single-stage extraction efficiency exceeds 90%, while the overall system recovery rate is greater than 98%.
2.Stripping Stage
The DMF-loaded organic phase undergoes alkaline stripping in the CWL-M centrifugal extractor, enabling regeneration and recycling of the extractant. The extractant recovery rate reaches 97%, significantly reducing operating costs.
3.Purification Stage
The DMF solution obtained from stripping is purified by distillation to produce DMF with a purity above 99%, meeting the requirements for reuse in production processes.
Application Results: Economical and Environmental Benefits Verified Across Multiple Industries
At an agrochemical manufacturing enterprise, the CWL-M-250 centrifugal extractor unit was applied to treat DMF wastewater with a daily processing capacity of 80 tons. Operational data show that the DMF recovery rate reached 96.5%, with approximately 1,200 tons of DMF recovered annually.
At a pharmaceutical active ingredient (API) manufacturer, a technical upgrade replaced the original evaporation-based treatment process with a centrifugal extraction process. After the retrofit, the recovered DMF purity increased from 92% to 98.5%, steam consumption was reduced by 65%, and the overall annual economic benefits increased significantly.
Tiei Extraction’s CWL-M centrifugal extraction technology provides an efficient and reliable solution for DMF wastewater treatment. By organically integrating resource recovery with wastewater remediation, it helps enterprises achieve simultaneous improvements in environmental performance and economic returns. The broader adoption of this technology will strongly promote green and sustainable development across related industries.
Email: sales@tieiextraction.com
Whatsapp: +86 19069612820
