Production wastewater treatment process of intermediate for synthesizing 2-nitroso-1-naphthol-5-sulfoacid by 1-naphthol-5-sulfoacid

A technology for waste water production and treatment process, which is applied in special compound water treatment, neutralized water/sewage treatment, water/sewage treatment, etc., and can solve the problems of limited treatment efficiency, increased treatment cost, loss of intermediates in the production of dye molecules, etc. Achieve the effect of saving pharmaceutical costs, reducing the organic load rate, and easy operation of the treatment process

Inactive Publication Date: 2018-08-14
DALIAN NATIONALITIES UNIVERSITY
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Problems solved by technology

However, such wastewater contains a large amount of lost dye molecules and production intermediates before extraction treatment, COD Cr The value is usually between tens of thousands to hundreds of thousands of milligrams per liter, and the treatment efficiency of only one method through Fenton's reagent is very limited
Extraction is an effective method to deal with high-concentration and refractory organic matter, but the extraction agent needs to be regenerated in this treatment method, which increases the treatment cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) Oxidation of Fenton's reagent

[0013] The pH of the production wastewater for the synthesis of 2-nitroso-1-naphthol-5-sulfonic acid intermediate from 1-naphthol-5-sulfonic acid is 1-2. At this pH value, add 5g / L FeSO 4 ·7H 2 O in the wastewater, stir and dissolve, add H dropwise 2 o 2 , H 2 o 2 The amount of addition is 0.5L / L, and the reaction time is 90min. COD Cr The removal efficiency was 84%, and the color of wastewater changed from dark brown to brownish yellow.

[0014] (2) Neutralization - coagulation treatment

[0015] Slowly add Ca(OH) to the wastewater after Fenton reagent oxidation 2 Milk of lime, stirred, to adjust the pH of the wastewater to 7-8. Let stand for 2hr, layered. The upper layer is a light yellow turbid liquid, and the lower layer is a yellow-gray precipitate. The upper layer is filtered to separate the light yellow turbid liquid to obtain the filtrate. COD Cr The removal efficiency is 30%. Oxidation-neutralization of coagulate...

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Abstract

The invention relates to a chemical production wastewater treatment process and in particular to a production wastewater treatment process of an intermediate for synthesizing 2-nitroso-1-naphthol-5-sulfoacid by 1-naphthol-5-sulfoacid. The process comprises the following steps: firstly adding a Fenton reagent to production wastewater of the intermediate for synthesizing the 2-nitroso-1-naphthol-5-sulfoacid by the 1-naphthol-5-sulfoacid and performing an oxidation reaction, and adding Ca(OH)2 for hierarchically filtering, separating supernatant liquid to obtain filtrate, and adding sodium hypochlorite to the filtrate, finishing the treatment. Because the effective connection and the synergistic effect between treatment process units, the treatment process is capable of enabling the removal efficiency of wastewater CODCr to be up to 96%, a CODCr value of the treated water is 800 mg/L. In addition, chemical reagents related in the treatment process are common chemical products, and easy topurchase, and the price is cheap.

Description

technical field [0001] The invention relates to a chemical production wastewater treatment process, in particular to a production wastewater treatment process for synthesizing 2-nitroso-1-naphthol-5-sulfonic acid intermediate from 1-naphthol-5-sulfonic acid. Background technique [0002] The production wastewater of 2-nitroso-1-naphthol-5-sulfonic acid intermediate synthesized from 1-naphthol-5-sulfonic acid has low pH, high concentration, high chroma, refractory degradation, high toxicity, and Disadvantages such as poor biochemical properties. At present, there is no relevant report on the wastewater treatment process for the production of 2-nitroso-1-naphthol-5-sulfonic acid intermediate in China. Ma Dongmei et al. reported Fe 2+ Efficiency of Catalytic Hydrogen Peroxide Oxidation Treatment of H Acid (1-Amino-8-Naphthol-3,6-Disulfonic Acid) Crystallization Waste Mother Liquor Extraction Raffinate. in H 2 o 2 The dosage is 140mmoL / Ln(H 2 o 2 ):n(Fe 2+ ) is 15:1, whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/36
CPCC02F9/00C02F1/5236C02F1/66C02F1/722C02F1/725C02F1/76C02F2103/36C02F2209/06C02F2209/08C02F2305/026
Inventor 仉春华乌云娜王文君李刚蒋新辉李丽颖
Owner DALIAN NATIONALITIES UNIVERSITY
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