2-naphthol wastewater processing technology

Abstract

A disclosed 2-naphthol wastewater processing technology comprises adjusting the pH value of wastewater to be neutral, then enabling wastewater to enter MVR water processing operation and performing evaporation concentration, and returning clear water obtained after evaporation condensation to a workshop for reutilization; cooling wastewater subjected to concentration, crystallizing to precipitate sodium 2-naphthalenesulfonate, then performing separation, enabling the obtained filtrate to enter refrigeration desalting operation and performing cooling reprocessing, crystallizing to precipitate inorganic salts, performing separation on the crystal-containing concentrate to obtain the inorganic salts, and drying; and enabling the clear liquid subjected to refrigeration desalting to enter the MVR water processing operation and performing cyclic concentration. The processing technology performs cooling crystallization separation on wastewater at different temperature by utilizing the principle that the solubility difference of organic salts and inorganic salts is large in wastewater at different temperature, thereby effectively removing sodium 2-naphthalenesulfonate, sodium sulfite and sodium sulfate in wastewater. The processing technology is simple, employed equipment is less, energy consumption is less, cost is low and processing efficiency is improved.

Description

Technical field [0001] The invention relates to the field of sewage treatment, in particular to a 2-naphthol wastewater treatment process. Background technique [0002] The 2-naphthol production process of the sulfonation-alkali fusion method will produce a large amount of waste water during the production process. The waste water is characterized by high salt content and high COD. The waste water contains 4% sodium sulfite and 8% sulfuric acid. Sodium and 3% sodium 2-naphthalenesulfonate need to go through a series of wastewater treatment before they can meet the discharge standards. Therefore, the treatment process is complicated, the process is long, the treatment is difficult, the equipment is large, the energy consumption is high, and the cost is high. Summary of the invention [0003] The purpose of the present invention is to provide a 2-naphthol wastewater treatment process with simple process flow and low energy consumption to solve the problems raised in the background a...

AI Technical Summary

Problems solved by technology

[0002] The 2-naphthol production process of the sulfonation-alkali fusion method will produce a large amount of wastewater during the production process. The wastewater is characterized by high salt content and high COD. The wastewater contains 4% sodium sulfite and 8% sulfuric acid. Sodium and 3% sodium 2-naphthalenesulfonate require a series of wastewater treatment before they can be discharged up to standard, so the treatment process is complicated, the process is long, the treatment is difficult, it takes up a lot of equipment, consumes a lot of energy, and the cost is high

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