Isopropyl alcohol (IPA) is an important organic chemical raw material and an excellent organic solvent. Isopropyl ether (DIPE) is a good solvent for animal, plant and mineral oils and fats. It is used as a standard substance, solvent and extractant for chromatographic analysis and has high added value. The industrial process of producing isopropyl alcohol by propylene-water synthesis will produce a large amount of organic wastewater containing high concentrations of isopropyl ether and isopropyl alcohol. Separating and recycling them can not only reduce environmental pollution but also avoid the loss of high-value products.
CWL-M centrifugal extractor mainly adopts extraction distillation method in the separation process of isopropyl ether and isopropyl alcohol, with ethylene glycol as the extractant, and has good separation effect for separation and recovery of alcohol ether organic wastewater.
Extraction distillation is a common method for separating azeotropic systems. Its principle is to separate the system by adding a component with a higher boiling point (extractant) to increase the relative volatility between key components and destroy the azeotropic composition. In the design process of extractive distillation, the amount of extractant is a key design variable, which not only affects the operating cost and equipment cost of the extractive distillation column, but also determines the total cost of the extractant recovery column and circulation.
The CWL-M centrifugal extractor developed and produced by Zhengzhou Tiei Extraction can be well applied to the extraction and separation operation.
The organic wastewater containing high concentration of isopropyl ether and isopropyl alcohol and ethylene glycol extractant are injected into the centrifugal extractor in a certain proportion. With the help of the rotation of the drum, the two phases are quickly mixed and dispersed through the impeller to complete the mixed mass transfer process. The mixed liquid enters the drum under the action of the vortex disk. Under the action of centrifugal force, the two phases of liquid are quickly separated and discharged from the machine body through different outlets, completing the two-phase separation process.
For the treatment process of high-concentration organic wastewater containing isopropyl ether and isopropyl alcohol, the optimal liquid-feed extraction system is developed by analyzing the effect of the amount of extractant ethylene glycol on the relative volatility of the isopropyl alcohol, isopropyl ether and water system. This can not only achieve the discharge standard of organic wastewater, but also have great economic benefits.
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