Recovery and utilization method for dyeing residual liquid of reactive dye

A technology of dyeing residual liquid and reactive dyes, which is applied in the textile field, can solve the problems of expensive treatment costs, inability to remove salt, and high equipment requirements, and achieve the effects of reducing sewage treatment costs, reducing dyeing salinity costs, and reducing COD values

Active Publication Date: 2012-10-24
DYMATIC CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high concentration of electrolytes and alkaline agents, reactive dyeing residue is the most difficult dyeing wastewater to treat. In conventional water treatment projects, only simple physical and chemical treatments such as decolorization, precipitation, and neutralization can be performed on it, and the salt in it cannot be removed. , and though reverse osmosis, electrodialysis, ion exchange and other methods can treat the inorganic electrolyte in the waste liquid, the equipment requirements are high and the treatment cost is very expensive

Method used

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  • Recovery and utilization method for dyeing residual liquid of reactive dye
  • Recovery and utilization method for dyeing residual liquid of reactive dye
  • Recovery and utilization method for dyeing residual liquid of reactive dye

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 (Adsorption Rate of Dye Capture Agent Color Clean)

[0026] Dyeing recipe:

[0027] Reactive black KN-B: 1.5%

[0028] Yuan Mingfen: 60 g / L

[0029] Sodium carbonate: 18g / L

[0030] Sodium bicarbonate: 2 g / L

[0031] Liquor ratio 1:13, dyeing cotton knitted fabric at 60℃×60min.

[0032] After dyeing, the residual liquid was collected and treated with the dye catching agent Color Clean, and the absorbance of the test solution was calculated according to formula 1:

[0033] Adsorption rate = A1 / A0 × 100% (Equation 1)

[0034] Wherein, A1 is the absorbance of the solution after being treated with the dye catching agent Color Clean, and A0 is the absorbance of the solution before being treated with the dye catching agent Color Clean.

[0035] The effect of treatment time on the adsorption rate can be seen in figure 1 . Referring to Figure 1, from figure 1 According to the results, the removal rate of dye in the residual l...

Embodiment 2

[0036] Embodiment 2 (dyeing test)

[0037] The fabric used in this example is a 32s pure cotton double-sided semi-bleached fabric, and the dyeing process is a liquor ratio of 1:13, dyeing at 60° C. for 60 minutes.

[0038] The dyeing recipe process is as shown in Table 1 in the present embodiment.

[0039] Table 1

[0040]

[0041] The above o.w.f = On weight the fabric, the concentration in the dyeing and finishing process is based on the weight of the fabric, relative to the percentage of the fabric, for example: under certain conditions, dyeing 100 kg of fabric, the amount of dye is 4% (o.w.f.) means dyeing these fabrics Required: 100 x 0.04 = 4 kg of dye.

[0042] Table 2 shows the test results of dyeing depth (K / S value) and color difference (⊿E) in this example.

[0043] Table 2

[0044]

[0045] In Table 2, STD (standard) refers to the color difference of fabrics dyed with recycled water, using the tap water dyed sample as the standard, and the color differenc...

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Abstract

The invention provides a recovery and utilization method for a dyeing residual liquid of a reactive dye. The method comprises the following steps: (1) performing an absorption treatment for the dyeing residual liquid to get a treatment liquid; (2) filtering the treatment liquid; (3) determining salt and alkali content in the treatment liquid; (4) adding the dye into the treatment liquid; (5) supplying the salt, the alkali and the water so that the treatment liquid reaches to a concentration required by the dyeing technology; (6) dyeing according to the dyeing technology; and (7) repeating step (1) to (6), wherein an adsorbent used in the step (1) for absorption treatment is a dye capture agent. The recovery and utilization method for the dyeing residual liquid of the reactive dye provided by the invention can reduce the amount of the salt or the alkali during the dyeing process by using the salt (anhydrous sodium sulfate or sodium chloride) or the alkali in the residual liquid, thereby effectively resolving a problem that high salt in waste water of a dyeing factory is difficult to deal with, reducing an emission amount of sewage and a COD value of the wastewater, and reducing cost of sewage treatment.

Description

technical field [0001] The invention relates to the technical field of textiles, in particular to a dyeing method for reusing active dye dyeing residue. Background technique [0002] Cotton fiber is a natural fiber. Cotton textiles have the characteristics of breathability, moisture absorption, good strength, and natural degradation. It is the largest fiber type in textile fibers. At present, cotton fibers are mainly dyed with reactive dyes. During the dyeing process, a large amount of salt (salt or sodium chloride) and alkali must be added, and the dyeing wastewater has high chroma. Due to the high concentration of electrolytes and alkaline agents, reactive dyeing residue is the most difficult dyeing wastewater to treat. In conventional water treatment projects, only simple physical and chemical treatments such as decolorization, precipitation, and neutralization can be performed on it, and the salt in it cannot be removed. , and though reverse osmosis, electrodialysis, io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F103/30
Inventor 顾学平曹永恒李世琪
Owner DYMATIC CHEM
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