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Solvent extraction of benzene series dyes intermediates wastewater treatment

by:Deyuan      2020-08-10
Dye intermediates industry belongs to high energy consumption, high pollution, in the process of production often need to repeatedly washed, will produce large amounts of byproduct or rinse water. Dye intermediates mainly used in the production of various aromatic derivatives of dyes and organic pigments, benzene, naphthalene, heterocyclic series of intermediates and anthraquinone is four categories, including benzene and naphthalene series varieties in the majority.

benzene series dye intermediates wastewater is mainly composed of various products, by-products, material and rinse water. Benzene series dye intermediates wastewater with high COD, high content of organic matter, but biological sex difference, high chromaticity and ingredient complex, great, toxicity, environmental pollution is serious, management difficulty is very big.

benzene series dye intermediates wastewater composition complex, high chromaticity, high COD and biological oxygen demand (COD), when processing, the main methods are: physical method, chemical method and biological method, solvent extraction, etc. Because the benzene series dye intermediates wastewater biological sex difference, thus solvent extraction is often cited as the pretreatment method of wastewater, facilitate the recovery of dye intermediates from waste water and improve the biological sex.

extraction method is the use of pollutants in the waste water in the water and the solubility difference between extractant, pollutants in water solubility in the solvent added is greater than, so most of the pollutants in the waste water will be transferred to extracting agent, and then the back extraction, the pollutants from extraction agent. In view of the actual wastewater, complexation extraction method is the most frequently used. Complexation extraction method is easy in the wastewater to some form of complex material using extraction agent interacts with the organic matter in wastewater, and extraction separation. In the operation process, complexation extraction agent and benzene series dye intermediate wastewater by certain proportion into the centrifugal extraction machine, with the aid of the rotation of the drum, through the impeller the two-phase mixing and dispersing quickly, and complete the mixing and mass transfer process. After mixing liquid under the action of vortex disk into the rotary drum, in under the action of centrifugal force, two phase fluid fast separation and through different export eduction body, to complete the two phase separation process. And then the back extraction, the pollutants with the extraction solvent separation, extraction solvent can be recycled, pollutants can realize effective recycling, achieve the purpose of purifying waste water, extraction of pollutants.

related extraction equipment figure:



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