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Dye intermediates such as 2-naphthol production wastewater treatment and resource utilization method

A technology for dye intermediates and wastewater production, which is used in neutralization water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc. The problem is solved, the treatment method is simple, and the treatment cost is reduced.

Active Publication Date: 2020-05-08
内蒙古美力坚科技化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] ① The process is cumbersome, especially the process of crystallization and separation of sodium 2-naphthalenesulfonate and inorganic salts;
[0007] ② The obtained inorganic salt contains organic matter such as sodium sulfate, sodium sulfite and sodium 2-naphthalenesulfonate, which cannot be commercialized, resulting in a large amount of solid waste and high processing costs;
[0008] ③High-concentration organic wastewater is concentrated and enriched through the MVR cycle, which cannot be completely harmless treated

Method used

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  • Dye intermediates such as 2-naphthol production wastewater treatment and resource utilization method

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Effect test

Embodiment 1

[0025] A treatment method for neutralizing wastewater in the production of 2-naphthol, wherein the neutralizing wastewater contains about 3-5 wt% of sodium sulfite, about 7-9 wt% of sodium sulfate and about 2-4 wt% of sodium 2-naphthalenesulfonate, COD It is 44000mg / L.

[0026] Treatment methods for this wastewater include:

[0027] (1) Acidification and separation: use sulfuric acid to adjust the pH value of the wastewater to 2.5-3, vacuumize to 250-300 mm Hg, heat to 80-90°C, stir and react until no sulfur dioxide gas is produced, and the generated sulfur dioxide gas returns to the Used in the acid analysis process of 2-naphthol production process;

[0028] (2), MVR evaporative concentration: the pH value of the waste water after acidification and separation is adjusted to 7.5-8, and MVR evaporative concentration is carried out to obtain evaporative condensed clear water and high-salt, high-concentration organic waste water with a salt content of about 50%, wherein evaporat...

Embodiment 2

[0031] A method for treating hydrolyzed waste water in J acid production. The hydrolyzed waste water contains 500-550 g / L of sulfuric acid, about 50-100 g / L of sodium sulfate, and about 35000 mg / L of CODcr.

[0032] Treatment methods for this wastewater include:

[0033] (1) MVR evaporation and concentration: adjust the pH value of the wastewater to 7.5-8 with liquid caustic soda, and carry out MVR evaporation and concentration to obtain evaporative condensed water and high-salt, high-concentration organic wastewater with a salt content of about 50%, and evaporated condensed water COD≤300mg / L, back to production;

[0034] (2) Oxidation and drying of spray oxidation tower: High-salt, high-concentration organic wastewater is oxidized and dried by spray oxidation tower, and it is specifically treated in sequence by pre-concentration section, solidification section, high-temperature carbonization section, and oxidation section. The temperature of the oxidation section is ≥1100 ° ...

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Abstract

The invention relates to a method for treating and resourcefully utilizing dye intermediate production wastewater. The dye intermediate production wastewater includes neutralized wastewater generated in a neutralizing work procedure. The method comprises the steps: (1) MVR evaporation and concentration: adjusting pH of the neutralized wastewater to 7.5 to 9 and performing MVR evaporation and concentration to obtain evaporation and concentration clean water and high-salinity high-concentration concentrated wastewater, wherein the evaporation and concentration clean water is reused for production; (2) oxidation and drying of an atomizing and oxidizing tower: oxidizing and drying the high-salinity high-concentration concentrated wastewater obtained in the step (1) through the atomizing and oxidizing tower, enabling organisms to be oxidized, decomposed and removed at high temperature and atomizing and granulating salt to obtain sodium sulfate. The wastewater treatment method disclosed by the invention is simple, can completely solve the problem that dye intermediate wastewater is difficult to treat, can remarkably reduce treatment cost, greatly utilizes resources and reduces environmental pollution.

Description

technical field [0001] The invention relates to a method for the treatment and resource utilization of dye intermediate production wastewater, in particular to a method for the treatment and resource utilization of 2-naphthol production wastewater. Background technique [0002] Dye intermediates, especially naphthalene-based intermediates such as 2-naphthol, H acid, γ acid, J acid, etc., all involve sulfonic acid neutralization process in their production process, which will produce a large amount of waste water. The waste water is characterized by High salt content, high COD, difficult to handle, complex process, occupying a lot of equipment, large energy consumption, high cost. Taking 2-naphthol as an example, 2-naphthol is an important dye intermediate, which can be used as an intermediate in the manufacture of aniline dyes, an anti-aging agent in the rubber industry, and an evaporation accelerator for the sun-dried salt industry. agent, as well as ice dyes for pigments,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D5/00C07C37/055C07C39/14C02F101/30
CPCC01D5/00C02F1/04C02F1/12C02F1/66C02F1/72C02F9/00C02F2101/308C07C37/055C07C37/64C07C303/06C07C303/32C07C39/14C07C309/35
Inventor 易元龙毕永星
Owner 内蒙古美力坚科技化工有限公司
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