Method for treating waste water of H-acid production

Abstract

The present invention is a treatment method for naphthalene dye intermediate H-acid production wastewater. After H-acid pretreatment wastewater is preprocessed, organic compounds such as, 1-amido-8- naphthol-3, 6-disulfonic acid (H-acid) and intermediate products, are adsorbed on the resin through alkalescence macroporous adsorption resin; the adsorbed water is added with lye for desorption regeneration and the regenerated liquid will be back into the previous production process for application. The CODcr of the treated wastewater can be effectively reduced to reach the national emission standards; the reclaimed H-acid sodium salt can be used. The resin can be desorbed and regenerated through lye for repeated use. The desorbed liquid is distilled and reclaimed, and the distilled effluent can be used repeatedly. The H-acid sodium salt and the intermediate products reclaimed through the invention can be used as raw materials for the original production process; therefore, the invention not only helps treating wastewater but also realizes waste resource utilization.

Description

technical field [0001] The invention relates to the treatment of production waste water discharged during the production process of an important dye intermediate H-acid (1-amino-8-naphthol-3,6-disulfonic acid). Specifically, it is the recycling of 1-amino-8-naphthol-3,6-disulfonic acid (H-acid) and its intermediate products and the recycling of H-acid sodium salt in wastewater, so as to realize the discharge of wastewater up to standard, Finally, the comprehensive treatment and resource utilization of 1-amino-8-naphthol-3,6-disulfonic acid (H-acid) production wastewater will be realized. Background technique [0002] H-acid, also known as 1-amino-8-naphthol-3,6-disulfonic acid, colorless crystal, is an important dye intermediate, mainly used in the production of acidic, reactive dyes and azo dyes, also Can be used in the pharmaceutical industry. Slightly soluble in cold water, easily soluble in hot water, soluble in alkaline solutions such as soda ash and caustic soda. Su...

AI Technical Summary

Problems solved by technology

[0005] H-acid belongs to the intermediate of naphthalene series dyes. At present, the wastewater treatment methods have been reported in the literature, including wet oxidation method, photocatalytic oxidation method, extraction method (including liquid film extraction method and complex extraction method), concentration method, electrodialysis These methods have problems such as complex equipment, difficulty in guaranteeing the quality of special materials, expensive chemicals, harsh operating conditions (such as high temperature, high pressure, etc.), high energy consumption, and secondary pollution.

[0006] Due to the high salinity and CODcr of H-acid wastewater, the effective treatment of this type of wastewater is still a big problem.

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