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Method for producing naphthalene-based superplasticizer by using H acid wastewater recovered solution

A high-efficiency water-reducing agent and wastewater recycling technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. problems, to achieve good economic and environmental benefits, protect the environment, and improve the effect of pollution

Active Publication Date: 2013-02-06
ZHEJIANG JISHENG CHEM BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, due to the many side reactions in the production process of H acid, the organic matter recovered by complex extraction or resin adsorption has a large content of impurities and complex components, and the recycled materials are not suitable for continuing to be used as raw materials for the synthesis of H acid
The above-mentioned H-acid acid analysis mother liquor recovery material can only partially utilize its active ingredients when returning the H-acid production process, and other impurities will still be discharged
At the same time, the isolated T acid produced in the production process of H acid will have more impurities and more complex components in the organic matter recovered by complex extraction or resin adsorption. Returning to the production process of H acid will have a greater impact on the quality of subsequent products.
The above documents and patents propose that the treatment and utilization of H-acid wastewater is not the ultimate treatment method

Method used

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  • Method for producing naphthalene-based superplasticizer by using H acid wastewater recovered solution
  • Method for producing naphthalene-based superplasticizer by using H acid wastewater recovered solution
  • Method for producing naphthalene-based superplasticizer by using H acid wastewater recovered solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Get 120mL of production waste water (pH=2, COD=20000mg / L, salt content=100g / L) of H acid-base fusion and acid analysis process, adopt the system of trialkylamine+octyl alcohol+kerosene as extraction agent, to H acid Production wastewater is extracted. Add H-acid production wastewater and 40ml extractant into a 250ml separatory funnel, shake for 20 minutes at room temperature and then let stand for 40 minutes to separate the organic phase and the aqueous phase. The obtained aqueous phase was subjected to multistage extraction by the same method as above, and the COD of the treated aqueous phase was 800 mg / L.

[0028] The obtained extract was transferred into a separatory funnel, and 18 ml of 20% sodium hydroxide solution was added for back extraction. After oscillating for 30 minutes at room temperature, stand still for 30 minutes to separate the extractant and back-extraction solution, the extractant is recycled, and the back-extraction solution is used to produce a wa...

Embodiment 2

[0031] Get 100mL of H acid separation T acid process production wastewater (pH=2, COD=38500mg / L, salt content=200g / L), adopt the system of trialkylamine+octyl alcohol+kerosene as extraction agent, to H acid production waste water for extraction. Add H-acid production wastewater and 30ml extractant into a 250ml separatory funnel, shake for 20 minutes at room temperature and then let stand for 40 minutes to separate the organic phase and the aqueous phase. The obtained aqueous phase was subjected to multi-stage extraction by the same method as above, and the COD of the treated aqueous phase was 1500 mg / L.

[0032] The obtained extract was transferred into a separatory funnel, and 10 ml of 20% sodium hydroxide solution was added for back extraction. After oscillating for 30 minutes at room temperature, stand still for 30 minutes to separate the extractant and back-extraction solution, the extractant is recycled, and the back-extraction solution is used to produce a water reducer...

Embodiment 3

[0035] Take 100mL of mixed waste water (pH=2, COD=30000mg / L, salt content=150g / L) from H acid-base fusion acid separation process and T acid separation process, and use the system of trialkylamine + sulfonated kerosene as the extraction agent , to extract H acid production wastewater. Add H-acid production wastewater and 30ml extractant into a 250ml separatory funnel, shake for 20 minutes at room temperature and then let stand for 40 minutes to separate the organic phase and the aqueous phase. The obtained aqueous phase was subjected to multistage extraction by the same method as above, and the COD of the treated aqueous phase was 1220 mg / L. After the water phase is decolorized by activated carbon, the salts therein can be recovered through concentrated crystallization.

[0036] The obtained extract was transferred into a separatory funnel, and 10 ml of 20% sodium hydroxide solution was added for back extraction. After oscillating for 30 minutes at room temperature, stand st...

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Abstract

The invention provides a method for producing a naphthalene-based superplasticizer by using an H acid wastewater recovered solution; and the naphthalene-based superplasticizer meeting quality requirements are prepared through carrying out complexation extraction or resin adsorbing process on H acid producing wastewater so as to obtain a strip liquor or a resin desorption liquor, adding the strip liquor or the resin desorption liquor to condensation production and neutralization reaction links of a naphthalene-based plasticizer as additives. According to the invention, a new way for treating and comprehensively utilizing the H acid wastewater is built, the pollution status of the H acid industry can be effectively improved, the environment is protected, the H acid producing wastewater is comprehensively utilized, and good economic and environment friendly benefits are obtained; and through the adoption of the naphthalene-based plasticizer prepared by the method provided by the invention, advantages of high water reducing efficiency, small slump loss through time and the like can be kept and the strengths of cements and concretes can be also enhanced.

Description

(1) Technical field [0001] The invention relates to a method for producing a naphthalene-based high-efficiency water reducer by utilizing H-acid wastewater recovery liquid. (2) Background technology [0002] H acid (1-amino-8-naphthol-3,6-disulfonic acid) monosodium salt is an important naphthalene-based dye intermediate. 6-Naphthalene trisulfonate, then nitrated to obtain nitro T acid, and the nitrated mixture was depleted of nitrogen dioxide, neutralized with ammonia water, then reduced with iron powder to obtain amino T acid, separated T acid, and replaced ammonium with sodium salt Salt, alkali fusion and acid precipitation to obtain H acid monosodium salt. The above process has gone through sulfonation, nitrification, denitration, neutralization, reduction, segregation, alkali fusion, acid precipitation and other links. The process is complicated and lengthy, the product yield in the production process is low, and a large amount of organic matter enters the wastewater. ...

Claims

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Application Information

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IPC IPC(8): C04B24/20C02F9/04C04B103/30
Inventor 何旭斌陶建国孟明朱敬鑫韩玉龙
Owner ZHEJIANG JISHENG CHEM BUILDING MATERIALS