High purity DMF wastewater treatment and recovery

DMF wastewater treatment

Industrial wastewater treatment covers the mechanisms and processes used to treat waters that have been contaminated in some way by anthropogenic industrial or commercial activities prior to its release into the environment or its re-use.

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Sources of industrial wastewater

DMF is an organic solvent with stable chemical property, high boiling point and excellent performance, which was called alkahest, it was used in pesticide, PU leather, PVC etc. synthesis and production of chemical products. In above production processes, there is a lot of DMF in the discharged wastewater usually, if discharged DMF wastewater directly, it will not only cause some economic loss and serious pollution to the environment.
For example, one chemical factory discharged more than ten tons of wastewater which contained DMF 26~27wt% and 20tons wastewater which contained DMF below 10wt%, during the pesticide synthesis, and it also include about 10% salt. Aimed at this kinds of wastewater, we designed three-stage counter-current extraction technology, after the treatment, DMF content in wastewater down to under 1%, and DMF recovery reached above 96%.

Process of extraction technology for common wastewater treatment:

1.Benzotic acid wastewater process:

Customization or not: Yes

If supply small test or pilot-plant test: Yes

Centrifugal Extractor Working Pinciple:

1.Mixing and mass transfer process:

Light and heavy liquor enter in the annulus mixed zone proportionally and from two different feed pipe orifice respectively, which formed by bowl and shell, with the help of bowl’s rotation, the two phases through turbine disc and impeller mixing and dispersing quickly, after mass transfer completely, to finish mass transfer process.

2.Two phases separation process

With the eddy-current disc help, mixture enter in bowl, at the compartment formed by board, the mixture is quickly synchronized with the bowl, under the action of centrifugal force, the larger density liquor moving away from the bowl center to the wall gradually in the upward flow; and the small density liquor doing the opposite, after clarification, two liquids enter into collection chamber with their own weir plate respectively, and drawn out by tigella, to finish the separation process.

Extractor advantages:

●   Separation effect is obvious and large handling capacity;

●  Two phase materials contact with short time, and save extraction agent consumption and save cost；

●  High mass transfer rate, high stage efficiency, convenient start and stop, it can not break balance when stopped.

●  Cover small area, the cost of comprehensive investment is low.

●  Well-adapted, good flexibility, with intermittent operation, or single operation, or continuous counter current operation, and there is no need to add interstage pump.

Centrifugal Extractor Specification:

Model	Bowl diameter （mm)	Mixture flux(l/h)	Pipe diameter (mm)	Power(kw)	Dimension(mm)	Weight(kg)
CWL-25-M	25	10	φ10	0.18	270200760	10
CWL-50-M	50	50	DN20	0.18	400400800	18
CWL-150-M	150	1000	DN40	0.75	6206301150	120
CWL-250-M	250	3000	DN50	0.75-2.5	7507501400	460
CWL-350-M	350	8000	DN65	1.5-4	9509501688	680
CWL-450-M	450	15000	DN80	3-5.5	100010001800	880
CWL-550-M	550	30000	DN100	4.-7.5	120012001760	1100
CWL-650-M	650	60000	DN150	4-7.5	135013501960	1800
CWL-850-M	850	150000	DN200	7.5-15	150015002100	22

1. Equipment material will be chosen according to the feed physico-chemical property, common used SS304/316L/904L, common composite material, fluoride material and so on; 2. Above table is general parameter, real device has a little difference, please refer to the matched technological manual;
3. Above flux is under ideal condition, ratio of oil and water is their flux sum when 1:1.