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Comprehensive treatment method of H acid production wastewater

A technology for comprehensive treatment of production wastewater, applied in natural water treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of heavy pollution in resin regeneration and recycling, affecting the quality of H acid products, and short resin saturation cycle , to achieve the effect of no solvent entrainment, comprehensive treatment and resource utilization, and low cost

Active Publication Date: 2015-02-04
BLUESTAR LEHIGH ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent application numbers 200510037697.0 and 200710057544.1 both use resin adsorption to treat H acid production wastewater. Most of the H acid and T acid in the wastewater can be recycled, but the components in the wastewater are complex and long-term direct reuse will affect the H acid. product quality, and the resin saturation period is short, and the pollution of resin recycling is relatively heavy
The extraction and stripping process of this process produces a third phase, which affects the oil-water separation; and the extracted water and stripped recovery materials are directly returned to the production system, which affects the quality of H acid products
Chinese patent application number 01109651.9 uses trialkylamine or methyl chloride quaternary ammonium salt as a complexing agent, kerosene as a diluent, adopts a three-stage cross-flow extraction process, and adjusts acid step by step. The process is cumbersome and consumes a lot of acid and alkali. The amount of stripping liquid is large, no further research on the effluent and stripping liquid

Method used

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  • Comprehensive treatment method of H acid production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, a kind of H acid production wastewater comprehensive treatment method, its steps are as follows:

[0026] (1) Extraction: adjust the pH value of H acid production wastewater to 0.7 with inorganic acid, and fully mix the extractant with the oil-water ratio of 1:1 at 50°C for 5 minutes under normal pressure, and the raffinate phase after stratification is the extracted water Sent to the evaporation process, the extraction phase, that is, the loaded extractant, is sent to the stripping process for regeneration; the extraction stage is one level.

[0027] (2) Stripping: Take the above extract phase and mix it with the lye at 50°C for 20 minutes under normal pressure. Extraction evaporation system; the regenerated extractant is recycled for extraction, and the back extraction stage is one level.

[0028] (3) Evaporation: The above-mentioned raffinate phase enters the post-extraction water evaporation system for evaporation and concentration, and is filtered to...

Embodiment 2

[0031] Embodiment 2, with reference tofigure 1 , a kind of H acid production wastewater comprehensive treatment method, its steps are as follows:

[0032] (1) Extraction: adjust the pH value of H acid production wastewater to 1.5 with inorganic acid, and fully mix it with the extractant at 80°C for 3 minutes under normal pressure according to the oil-water ratio of 5:1, and the raffinate phase after stratification is the extracted water Sent to the evaporation process, the extraction phase, that is, the loaded extractant, is sent to the stripping process for regeneration; the extraction stage is one level.

[0033] (2) Stripping: Take the above extract phase and mix it with the lye at 80°C for 10 minutes under normal pressure. Extraction evaporation system; the regenerated extractant is recycled for extraction, and the back extraction stage is one level.

[0034] (3) Evaporation: The above-mentioned raffinate phase enters the post-extraction water evaporation system for evapo...

Embodiment 3

[0037] Embodiment 3, with reference to figure 1 , a kind of H acid production wastewater comprehensive treatment method, its steps are as follows:

[0038] (1) Extraction: adjust the pH value of H acid production wastewater to 1.20 with inorganic acid, and fully mix the extractant with the oil-water ratio of 3:1 at 60°C for 4 minutes under normal pressure, and the raffinate phase after stratification is the extracted water Sent to the evaporation process, the extraction phase, that is, the loaded extractant, is sent to the stripping process for regeneration; the extraction stage is one level.

[0039] (2) Stripping: Take the above extract phase and mix it with the lye at 65°C for 15 minutes under normal pressure. Extraction evaporation system; the regenerated extractant is recycled for extraction, and the back extraction stage is one level.

[0040] (3) Evaporation: The above-mentioned raffinate phase enters the post-extraction water evaporation system for evaporation and ...

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Abstract

The invention discloses a comprehensive treatment method of H acid production wastewater. The method comprises the following steps: regulating the pH value of the H acid production wastewater, afterwards complexing and extracting a naphthalene sulfonic acid type substance in the wastewater, back-extracting an extract phase by using alkaline liquor, recycling an extracting agent after the extracting agent is regenerated, evaporating and concentrating back-extraction liquid to synthesize a liquid dispersant product; transferring a raffinate phase into an evaporation system, evaporating and separating to obtain a sodium sulfate byproduct, and discharging the desalted evaporation and condensation water after the water reaches the standards by means of biochemical or oxidization flocculation treatment. According to the method disclosed by the invention, the naphthalene sulfonic acid type substance in the wastewater is recycled by utilizing a complexation-extraction method, and the sodium sulfate salt product is recycled by utilizing an evaporation method. The liquid dispersant product (degree of polymerization is 1-3) synthesized by utilizing the recycled naphthalene sulfonate solution is used as a dispersing agent in textile dyeing and leather industries. The method disclosed by the invention is reasonable in process design and can be used for effectively realizing comprehensive treatment and resource utilization of the H acid production wastewater.

Description

technical field [0001] The invention relates to a treatment method for chemical product production wastewater. Specifically, the complex extraction method is used to recover naphthalenesulfonic acids in H acid production wastewater to make a dispersant, the extracted water is evaporated to recover sodium sulfate, and the evaporated water is treated to reach the standard Discharge, realize the comprehensive treatment of wastewater. Background technique [0002] H acid (1-amino-8-naphthol-3, 6-disulfonic acid) is an important intermediate of naphthalene dyes, mainly used in the production of acid, reactive dyes and azo dyes, and can also be used in the pharmaceutical industry. The domestic H acid production process generally uses refined naphthalene as raw material, and is produced through sulfonation, nitration, neutralization, reduction, alkali fusion and acid precipitation. Sulfuric acid or hydrochloric acid is added in the acid analysis process to precipitate H acid monos...

Claims

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Application Information

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IPC IPC(8): C02F9/10B01F17/12C02F103/36C09K23/12
Inventor 董自斌杨志林王开春赵焰李学字胡聪王克云
Owner BLUESTAR LEHIGH ENG INST CO LTD
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