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Combination treatment method of 2-naphthol production wastewater

A technology for the production of waste water and treatment methods, which is applied in natural water treatment, multi-stage water/sewage treatment, extraction water/sewage treatment, etc. It can solve the problems of limited adsorption capacity, rising cost, and low concentration of regenerated liquid, and achieve the goal of recycling Utilization, treatment cost is low, and the effect of low cost

Active Publication Date: 2012-07-25
中国中化股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned treatment method can achieve its expected effect, but still has the following disadvantages: 1) Due to the high COD value of wastewater and the complexity of wastewater components, the use of resin to treat adsorption is limited; 2) The concentration of regeneration solution produced during resin regeneration Relatively low, so that the effect of recycling is not significant, and if it is reprocessed, it will inevitably lead to an increase in cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A combined treatment method for 2-naphthol production wastewater, comprising the following steps:

[0018] (1) complex extraction: the complexing agent and the diluent are mixed to obtain the extractant, wherein the volume percentage of the complexing agent in the extractant is 20%; the complexing agent is a trialkyl tertiary amine, and the diluent is aviation kerosene; The extraction agent is added to the 2-naphthol production wastewater, and the volume ratio of the extraction agent to the 2-naphthol production wastewater is 1:2; then add concentrated sulfuric acid to control the pH value to 2; the extraction reaction takes 60 minutes, and the two-phase After reaching the extraction balance, separate the loaded extractant and the water phase, which is the treated waste water; the loaded extractant that will be separated is added to a 15% sodium hydroxide solution in a mass percentage concentration of 5:1 by volume, React for 60 minutes, and after the two phases reach e...

Embodiment 2

[0021] A combined treatment method for 2-naphthol production wastewater, comprising the following steps:

[0022] (1) complex extraction: the complexing agent and the diluent are mixed to obtain the extractant, wherein the volume percentage of the complexing agent in the extractant is 30%; the complexing agent is a trialkyl tertiary amine, and the diluent is aviation kerosene; The extraction agent is added to the 2-naphthol production wastewater, the volume ratio of the extraction agent and 2-naphthol production wastewater is 1:3; then add concentrated sulfuric acid to control the pH value to 2; the extraction reaction is 45 minutes, two-phase After reaching the extraction balance, separate the loaded extractant and the water phase, which is the treated waste water; the loaded extractant that will be separated is added to a 10% potassium hydroxide solution in a volume ratio of 4:1, React for 45 minutes, and after the two phases reach the extraction equilibrium, separate the tr...

Embodiment 3

[0025] A combined treatment method for 2-naphthol production wastewater, comprising the following steps:

[0026] (1) complex extraction: the complexing agent and the diluent are mixed to obtain the extractant, wherein the volume percentage of the complexing agent in the extractant is 40%, and the diluent is 60%; the complexing agent is a trialkyl tertiary amine, diluted The agent is aviation kerosene; the extraction agent is added to the 2-naphthol production wastewater, and the volume ratio of the extraction agent and the 2-naphthol production wastewater is 1:4; then add concentrated sulfuric acid to control the pH value to 1; the extraction reaction After 30 minutes, after the two phases reached the extraction balance, separate the loaded extractant and the water phase, which is the treated waste water; add the separated loaded extractant with a volume ratio of 5: 1 with 15% concentration of Potassium hydroxide solution, reacted for 30 minutes, after the two phases reached ...

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Abstract

The invention discloses a combination treatment method of 2-naphthol production wastewater, belonging to the technical field of wastewater treatment. The method comprises the steps of: respectively treating the 2-naphthol production wastewater through complexing extraction and liquid membrane separation technologies to ensure that the wastewater is easily subjected to biochemical treatment; and respectively carrying out alkali washing and demulsification on a load extraction agent and a load emulsion to ensure that the extraction agent and a liquid membrane oil phase are regenerated, wherein a concentrated solution contains high-concentration sodium phenolate and sodium naphthalene sulphonic and can be reused in production sections. The treatment method of the 2-naphthol production wastewater has the advantages that the COD (Chemical Oxygen Demand) in the wastewater is reduced from about 100000mg / L to about 3000mg / L; nonbiodegradable organic pollutants in the wastewater are greatly decreased; the biodegradability of the wastewater is increased; reduction and resource utilization of the pollutants in the 2-naphthol production wastewater can be realized at the same time; and a certain economic benefit is provided.

Description

technical field [0001] The invention belongs to the field of chemical production wastewater treatment, and in particular relates to a combined treatment method for 2-naphthol production wastewater. Background technique [0002] 2-Naphthol is an important synthetic intermediate of organic fine chemicals. It is prepared from naphthalene as raw material through sulfonation, neutralization, substitution and other chemical reactions. Naphthol production process produces high-concentration organic wastewater with complex components. The COD value of wastewater is as high as 100,000mg / L, and most of them are refractory to biodegradable substances, so direct biochemical treatment is difficult. This type of wastewater discharge is characterized by intermittent discharge, with a small amount but high pollution intensity. [0003] At present, there are many studies on the resin adsorption process for the treatment of this type of wastewater. For example: Chinese Patent No.: 00132129....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/26C02F1/44C02F103/36
Inventor 程迪欧云川马文静李鹏宋红
Owner 中国中化股份有限公司
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