Method for recovering organic solvent from maleic anhydride wastewater

Abstract

The invention relates to a method for recovering an organic solvent from maleic anhydride wastewater. The method comprises the following steps: using an extracting agent to extract the maleic anhydride wastewater; separating extracted two phases to obtain an extracting liquid and a raffinate; separating the extracting liquid to obtain the extracting agent and the organic solvent; and separating the raffinate to obtain the extracting agent and residual wastewater. The provided method for recovering the organic solvent from the maleic anhydride wastewater recovers the organic solvent with high additional value, the consumption of the solvent used in the production of maleic anhydride is reduced, meanwhile, the substances of organic matters difficult to degrade in the wastewater, like dimethyl phthalate, diethyl phthalate, dibutyl phthalate (DBP), di-isobutyl hexahydrophthalate (DIBE) and dibutyl sebacate, are extracted, so that the biochemical degradation of the maleic anhydride wastewater is improved, the wastewater treatment cost is lowered, and the environmental pollution is reduced.

Description

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AI Technical Summary

Benefits of technology

This technology helps recycle valuable resources from menic acid compounds while minimizing their impact on environment or human health. It also makes it easier than traditional methods like burning them away after use without causing harmful side-effects.

Problems solved by technology

This patented technical problem addressed in this patent relates to improving the removal efficiency and quality of crude carboxymethanesulfonic esters (CMSAs) during manufacturing processes involving synthetic polymers like alifϊmate-, naphylenestyrene monomers, dicyclodesiloxanes, cyclohexadienones, styrenebutenics, hydroxypropyltriazoles, pyridines, quaternars, diaminoacides, triphenols, stannous chloride, chromatic acid, polytaphthaquinodium salt, trimellins, permaqueroidal acid, dioctachromatric acid, diacyl alcohol, formaldehydes, ethereuthenium dichloride hydrate, moldings containing these harmful metabolites, including succinate, citrapeptaleaceans, lignosulfancies, bacteriostats, volatile organic sulfur compound(VOS2), and metal ion contaminants.

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