DMF (N,N-dimethylamide) is a transparent liquid that is miscible with water and most organic solvents. It is a commonly used solvent for chemical reactions and is widely used in chemical synthesis, textile printing and dyeing, plastic products and coatings industries. . However, DMF is also a toxic and harmful substance, posing potential risks to the human body and the environment. Therefore, DMF wastewater treatment has become an important environmental issue.
Commonly used DMF wastewater treatment processes include physical methods, chemical methods, biological methods and their combined applications:
| DMF wastewater treatment process |
Advantages |
Disadvantages |
| Physical method |
Adsorption method |
Easy operation |
Adsorbent regeneration and replacement costs are high |
| Membrane separation |
Good separation |
The investment and operating costs of equipment are relatively high |
| Chemical method |
Oxidation method |
Good separation |
May produce toxic by-products |
| Reduction method |
Easy operation |
The treatment effect is greatly affected by pH |
| Biological method |
Aerobic biological
treatment |
Low cost |
The applicable concentration range is small and the removal rate of refractory organic matter is low. |
Anaerobic biological
treatment |
Can produce biogas and have secondary energy recovery effect |
Anaerobic biological value-added is slow, and anaerobic treatment operation factors are more complex. |
In addition to the above common DMF wastewater treatment processes, there are also methods such as distillation and extraction. However, during the distillation process, some DMF decomposes to form dimethylamine (DMA) and formic acid, which requires secondary treatment, and the direct distillation method consumes The power is too great, so few companies adopt this method. (The disadvantage is that it increases energy consumption and also reduces the purity of DMF).
The use of centrifugal extraction to treat DMF wastewater not only makes the process continuous, but also reduces the amount of solvent input, improves the recovery rate of DMF, and reduces the pressure of subsequent distillation to recover the solvent and the advanced treatment of wastewater (biochemical section).
The LCT series centrifugal extractor is a new, efficient and fast liquid-liquid mixing and separation equipment. Wastewater and extraction solvent are introduced into the equipment respectively. According to a certain ratio and flow rate, multi-stage countercurrent extraction is performed to obtain DMF-containing products. Extraction phase and low concentration DMF wastewater.
Why choose LCT centrifugal extractor to treat DMF wastewater?1. Good separation, and the DMF content in the wastewater can be reduced to less than 0.1%, which reduces the treatment pressure of the biochemical section;
2. Small footprint;
3. Less residual, save extraction agent;
4. Good sealing, no leakage, good and safe working condition;
5. Simple operation, high automation, greatly reducing labor costs;
6. Corrosion resistance, optional material of Fluorine, SS304, SS316L etc.
