In the field of fine chemical wastewater treatment, It is key reducing production costs and environmental risks with efficient recovery and standard discharge of DMF (N,N-dimethylformamide) .Our LC series centrifugal extractors, with their anti-emulsification, corrosion resistance and intelligent control advantages, provide efficient and low-consumption solutions for DMF wastewater extraction tests, significantly improving recovery efficiency and wastewater treatment effects.

Case Background
A chemical enterprise treated DMF-containing wastewater, its traditional extraction equipment had problems such as severe emulsification, low DMF recovery rate (less than 60%), and excessive solvent carryover. Especially when treating high-concentration DMF wastewater (COD exceeding 20,000 mg/L), traditional processes are prone to blurred phase interfaces and difficult phase separation, and the DMF residue after wastewater treatment exceeds the standard, making it difficult to meet environmental protection requirements. In order to break through the technical bottleneck, the company introduced the Liancui LC series centrifugal extractor for small-scale optimization.

Advantages Of LC Centrifugal Extractor
LC series centrifugal extractors are specially designed for the characteristics of DMF wastewater:

Anti-emulsification structure: adopts independent mixing chamber and drum separation design, and the stirring paddle is customized according to the viscosity of the wastewater to avoid the emulsification problem caused by excessive shear force in traditional equipment;
Super gravity separation: the speed can be adjusted in the range of 5000-8000rpm, the centrifugal force is more than 1000 times the gravity, the two-phase liquid is mixed and separated in milliseconds, and the extraction efficiency is significantly improved;
Corrosion-resistant material: the main body adopts SS316L+ fluorine material composite structure, which can withstand organic solvents, acids and alkalis in wastewater and other corrosive media to ensure long-term stable operation of the equipment;
Intelligent control: equipped with online COD and density monitoring system, real-time optimization of extraction parameters, and reduce the risk of manual intervention.

Testing With Lab LC centrifugal extractor 

Raw material pretreatment
DMF-containing wastewater (pH 8-9) and organic extractant (such as tributyl phosphate-kerosene system) are pumped into the mixing chamber of the centrifugal extractor at a volume ratio of 1:1.5, and the stirring paddle is fully mixed at a speed of 2500rpm to form an emulsion. 
Efficient separation
The mixed liquid enters the drum, and at a speed of 7500rpm, the aqueous phase (containing trace DMF) and the organic phase (loaded with DMF) are quickly separated under the action of centrifugal force. The aqueous phase is discharged from the outer edge of the drum, and the organic phase is discharged from the central tube, and the phase separation time is shortened to 1/4 of the traditional equipment. Multi-stage countercurrent extraction
The four-stage series process of centrifugal extractor is adopted to gradually improve the DMF recovery rate by adjusting the flow rate and speed of each stage of the extractant. The first stage is extracted to enrich DMF, the second and third stages are deeply purified, and the fourth stage further reduces the DMF residue in the aqueous phase. Finally, the organic phase is stripped to obtain a high-purity DMF solution, and the DMF residue in the wastewater is less than 50mg/L after treatment.
Result With Lab Centrifugal Extractor 

High recovery efficiency
The single-stage extraction rate is increased from 58% to 85%, and the total recovery rate after four-stage countercurrent extraction is more than 98%, and the DMF loss rate is reduced to less than 2%. Wastewater meets discharge standards
After treatment, the COD of wastewater is reduced from 20,000 mg/L to below 500 mg/L, and the DMF residue is less than 50 mg/L, meeting the "Emission Standards for Water Pollutants in Chemical Synthesis Pharmaceutical Industry".

Reduction Of Energy consumption & Cost
The energy consumption of the equipment is reduced by 30% compared with traditional equipment, the solvent consumption is reduced by 35%, and the single test cycle is shortened from 10 hours to 4 hours, which greatly improves the R&D efficiency. Significant environmental benefits
The equipment has strong sealing, organic solvent volatilization is reduced by 95%, and wastewater discharge is reduced by 60%, which meets the requirements of green chemical production.

Good Comments From User
The Liancui LC series centrifugal extractor showed significant advantages in the DMF wastewater extraction test: its anti-emulsification design, ultra-gravity separation technology and intelligent control system effectively solved the problems of low efficiency and severe emulsification of traditional equipment, greatly improved the DMF recovery rate and wastewater treatment effect, and reduced energy consumption and operation and maintenance costs.