nmp recovery extraction selection of green new CWL-M centrifugal extractor

The NMP waste solvent produced in the production process of polyphenylene sulfide industry, aramid fiber industry and lithium battery industry can be recycled to improve economic benefits. Solvent extraction has become an effective way to recover NMP waste solvent.

TIEI Extraction, as a world-renowned liquid-liquid extraction equipment and process service provider, has launched the CWL-M green new extraction process system for the recovery and extraction of NMP waste solution. The system adopts CWL-M continuous countercurrent centrifugal extraction equipment and suitable extractant for extraction, and design 4-5 stage extraction, which can extract nmp components from nmp waste solvent, and the subsequent extraction phase can be separated by rectification, or reverse Extraction treatment, solvent recovery and regeneration, and recycling.

The CWL-M green new extraction process system has mild extraction conditions, high product purity, no equipment corrosion and blockage, greatly reduced equipment costs, and easy recovery of extraction agents. It has broad prospects for industrialization and has good social benefits.

So, what is the process flow of nmp waste solvent recovery and extraction?

1. Extraction: Send the nmp waste solvent to the first-stage centrifugal extractor of the five-stage CWL-M centrifugal extraction equipment. The extractant toluene is added from the fifth-stage centrifugal extractor for continuous countercurrent extraction. The extraction equipment is operated at a temperature of At 25°C, the mass ratio of extractant to nmp waste solvent is 2:1.

2. Solvent recovery by rectification: the extraction phase (composed of extractant toluene and nmp) sent from the liquid liquid centrifugal extraction equipment is sent to the extraction phase rectification tower to separate nmp and extractant by rectification.