Process for treating dinaphthol wastewater by using complexation extraction method

Abstract

The invention discloses a process for treating dinaphthol wastewater by using a complexation extraction method. A process core includes that trioctylamine or trialkyl tertiary amine serves as a complexing agent, sulfonated kerosene serves as a diluent, and chloric acid tributyl ester serves as a chaotropic agent to be mixed according to a certain ratio into an extraction agent, the extraction agent comprises, by volume, 20% to 30% of the complexing agent, 60% to 70% of the diluent and 5% to 15% of the chaotropic agent. Dinaphthol production wastewater is extracted when the temperature is in a range of 20 DEG C to 30 DEG C and the pH is 1, aqueous phase: oil phase is 1: 1 (volume ratio), the removal rate of first extraction CODcr can reach 97%, naphthalene sulfonate in wastewater can be extracted through multistage extraction, and simultaneously water is discharged up to standard. Water phases of back extraction can be recycled as production materials; and organic phases are mixtures of the extraction agent and the diluent and can be recycled.

Description

technical field [0001] The invention relates to a process for treating dinaphthol wastewater by a complex extraction method, belonging to the technical field of water treatment. Background technique [0002] With the development of society, the problem of shortage of water resources is becoming more and more serious, and water will become an important factor restricting social development. People are also paying more and more attention to the development and improvement of water treatment technology. With the development of water treatment technology, ordinary wastewater can be treated very well by the current technology, but some difficult-to-treat wastewater needs further research, and the treatment of 2-naphthol production wastewater is one of them. [0003] 2-Naphthol, also known as β-naphthol and ethyl naphthol, is an important organic chemical raw material and dye intermediate, mainly used in dyes, organic pigments, rubber antioxidants, and pharmaceutical and pesticid...

AI Technical Summary

Problems solved by technology

[0004] The main synthesis process of 2-naphthol is: naphthalene sulfonation, hydrolysis, naphthalene blowing, neutralization and other processes. There are many processes, long process, and a large amount of three wastes. Among them, the wastewater has complex components, high concentration, high toxicity, deep color, acidity, etc. It has the characteristics of strong alkali buffering, difficult biochemical degradation and great harm to human body and environment

However, the resulting environmental pollution has not been effectively resolved

The use of macroporous resin adsorption is expensive (45,000 yuan / ton), frequent regeneration is required, and the amount of regenerated black liquor is too large to recover useful components; the COD removal rate continues to decline after the resin adsorption process has been running for a period of time; there are large resin consumption and analysis The amount of black liquor is large, valuable components cannot be recovered, and the consumption and cost of frequent resin regeneration agents are high. After resin adsorption treatment, the effluent is unstable, and the cost of wastewater treatment is as high as 120-150 yuan / m 3 , failed to meet the requirements of discharging into the municipal pipe network, the defect of high operating costs

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