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Extractive recovery method for aryl sulfonic acid salt in waste water

A technology of aryl sulfonate and recovery method, which is applied in the field of extraction and recovery of aryl sulfonate in printing and dyeing wastewater, to achieve the effects of reduced CODcr, less loss of extractant, and low process cost

Inactive Publication Date: 2008-07-30
广东纺织职业技术学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report about the extraction technology of aryl sulfonates in printing and dyeing wastewater, especially the extraction technology of direct dyes and acid dyes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The extraction and recovery method of aryl sulfonate in waste water of the present invention is made up of three steps of acidification-extraction-back extraction, and each step is described as follows:

[0015] Acidification: The purpose is to convert aryl sulfonate into aryl sulfonic acid to facilitate the extraction process. In the acidification step, the pH value of the waste water is ≤4.0, and the direct dye belongs to aromatic sulfonate (sodium) and has good water solubility. By adjusting the pH, the aromatic sulfonate is converted into aryl sulfonic acid, and the oil solubility of aryl sulfonic acid is enhanced compared with its salts.

[0016] Extraction: The extractant consists of organic amines, hydrocarbon solvents, and alcohols. Wherein, the extractant composition (volume percentage) is, organic amine: 5-100, hydrocarbon solvent: 5-80, alcohols: 0-80; Waste water / extractant (volume ratio) of extraction process: 1 / 0.01-100 ; Contact time 2-2000 minutes. Th...

Embodiment 2

[0020] In the recovery and extraction of direct yellow dye wastewater, adjust the pH value to 0.5 with sulfuric acid; the extractant consists of 25% trioctylamine, 15% octanol, 60 petroleum ether, and the volume ratio of wastewater / extractant is 5 / 1, stirring for 10 Minutes, stand for 15 minutes, the oil phase turns yellow, and the raffinate water is close to colorless, which can be directly used in the same color dyeing bath or washing process; use 20% NaOH solution for back extraction, the oil-water ratio is 1:1, and stir for 15 minutes After standing for 15 minutes, the oil phase becomes nearly colorless, and the water phase turns yellow, and the dyeing test using the water phase shows normal color.

Embodiment 3

[0022] In the recovery and extraction of acid red dye wastewater, adjust the pH value to 2.5 with sulfuric acid; the extractant consists of 45% trioctylamine, 5% octanol, and 50% petroleum ether, and the volume ratio of wastewater / extractant is 1 / 2, stirring 10 minutes, stand for 15 minutes, the oil phase turns red, and the raffinate water is close to colorless, which can be directly used in the dyeing bath or washing process of the same color; back extraction uses 20% NaOH solution, the oil-water ratio is 1:1, stirring for 15 After standing for 15 minutes, the oil phase becomes nearly colorless, and the water phase turns red. The dyeing test using this water phase shows that the color is normal, and the raffinate water is close to colorless. It can be directly used in the same color dyeing bath or washing Process, recycled dyestuff dyed cloth test showed normal color.

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PUM

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Abstract

The invention discloses a method for extracting and recycling the aryl sulfonate in wastewater, which is characterized in that the method comprises three steps of acidification-extraction-stripping. The purpose of acidification is to convert aryl sulfonate into aryl sulphonic acid, the purpose of extraction is to form the organic salt and then transfer to oil phase by utilizing aryl sulphonic acid and or amine salt. After oil-water separation, little aryl sulfonate exists in the extraction reffinate and can be used for the same technology or washing technology. The invention is also characterized in that the sulphonic acid or amine salt in oil phase can be easily converted into aryl sulfonate through double decomposition reaction of inorganic base solution, and the resource can be reused. In accordance with different type direct dyes in wastewater, optimal extractant components and extraction technology parameter, the extraction rate of direct dyes reaches 95 percent by the invention. Both wastewater chroma and CODcr are significantly decreased, the extracted dye can be reused, and the water residues can be reused directly or used for washing procedure.

Description

technical field [0001] The invention relates to the recovery and utilization of useful components and water in waste water, in particular to the extraction and recovery of aryl sulfonate in printing and dyeing waste water and the waste water utilization method. Background technique [0002] At present, the extraction recovery method has been successfully applied in the treatment of organic wastewater. Recycling of benzene compounds and phenolic compounds in wastewater from coal chemical enterprises; there are research reports on the use of extraction technology for the separation of organic acids (such as citric acid) at home and abroad; Han Wenya, Bi Yafan and others applied recovery technology to dyes Arylsulfonic acid in intermediate wastewater (such as 1-2-4 acid (6-nitro-1,2-diazooxynaphthalene-4-sulfonic acid), H acid (1-amino-8-naphthol -3,6-disulfonic acid) etc.) recycling. [0003] Printing and dyeing wastewater is characterized by complex components, high chroma,...

Claims

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Application Information

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IPC IPC(8): C07C309/28C07C303/44C02F1/26C02F103/30
Inventor 郭俊旺刘旭峰魏彩云
Owner 广东纺织职业技术学院
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