Ozone decolorization method for waste leftover cloth

A fabric and waste technology, which is applied in the field of ozone decolorization of waste and corner fabrics, can solve the problems of high decolorization cost, human harm, and low decolorization efficiency, and achieves the effect of reducing labor intensity, simple operation, and realizing mechanization.

Inactive Publication Date: 2006-07-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] (1) The decolorization efficiency is low, the decolorization solution cannot be recycled, and the discharge of waste water causes environmental pollution;
[0028] (2) A large amount of "chlorine" (including inorganic chlorine and organic chlorine) residues in products will cause harm to the human body;
[0029] (3) The cost of decolorization is higher
Since the decolorization solution cannot be regenerated or reused, it will not only cause environmental pollution, but also increase the cost of decolorization
[0030] (4) It is not suitable for centralized mass production, only suitable for family workshop production

Method used

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  • Ozone decolorization method for waste leftover cloth
  • Ozone decolorization method for waste leftover cloth
  • Ozone decolorization method for waste leftover cloth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1: Research on the decolorization time-pH value relationship of light blue, sky blue, pink, dark yellow, dark gray, and purplish red fabrics

[0058] When pH=5, the light blue cloth will turn white soon after directly injecting ozone, and the sky blue and pink cloths will also start to fade in 5 minutes, and the sky blue cloth will turn white in 15 minutes. The pink cloth also faded completely afterwards. The purplish red cloth has a slow decolorization speed because the color is too dark. With the continuous introduction of ozone, the dark yellow cloth and dark gray cloth are almost white in 30 minutes. However, at 60 minutes, some maroon cloth remained. When pH=6, 7, 8, 9, the test rules are basically similar

[0059] When pH=6, the time used for the cloth of various colors to achieve complete decolorization is the shortest.

Embodiment 2

[0060] Example 2: Research on the decolorization time-pH index relationship when these several color cloths of light blue, sky blue, pink, deep yellow, dark gray and purplish red are completely decolorized

[0061] When the ozone flow rate Q=2L / min, put the cloths of the above six colors into the water, adjust the pH value with 10% sodium hydroxide solution and 0.1mol / L sulfuric acid solution, and directly feed the ozone, observe Phenomenon.

[0062] Cloths of various colors are much better under acidic conditions than under alkaline conditions. It seems that the decolorization effect is the best when pH=6. Under mild conditions, the decolorization effect of dark yellow cloth is better than that of dark gray cloth.

Embodiment 3

[0063] Embodiment 3: when the decolorization time of these several color cloths of light blue, sky blue, pink, deep yellow, dark gray, burgundy red -pH refers to the ozone flow rate Q=3L / min, get the cloth of above six kinds of colors and put into water, Use 10% sodium hydroxide solution and 0.1mol / L sulfuric acid solution to adjust the pH value, directly pass through ozone, and observe the phenomenon.

[0064] Under acidic conditions, the decolorization time of various colors of cloth is relatively stable. Light blue can be decolorized into white in 5 minutes under acidic conditions, while when the pH value is 8 or 9, it takes more than 30 minutes to decolorize into white. There is also sky blue, and the decolorization time is 30 minutes apart under acid-base conditions.

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Abstract

The invention provides a decolouration method with ozone for waste piece cloth, which comprises: putting the cloth into water, adjusting its pH value to 5~9 with 10~ 30% caustic soda solutions and 0.1~1.0mol / L sulfosol; reacting for 40~90min to decoloring. The advantages of this invention include: discharging no three wastes, special without chlorine or other bleacher; realizing operation automation to decrease labor strength; and high decoloring rate more than 99%.

Description

technical field [0001] The invention belongs to the technical field of printing and dyeing, and in particular provides an ozone decolorization method for waste and old corner cloth. Utilizing ozone in water can release the primary Tailai with strong oxidation ability to oxidize the pigment in the waste scrap fabric or remove the pigment in the printing and dyeing wastewater. Background technique [0002] In my country's industrial wastewater, printing and dyeing wastewater accounts for a large proportion. Because of its high organic content, complex composition, deep color, alkaline, large changes in water quality, and large volume of wastewater, it has become an extremely difficult industrial wastewater recognized at home and abroad. one. Compared with other industries, not only the water consumption is large, but also the pollution is serious. Therefore, the treatment of printing and dyeing wastewater is very urgent. [0003] Traditional decolorization treatment methods ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P5/22
Inventor 孙春宝林海汪作胜白映晖宋波
Owner UNIV OF SCI & TECH BEIJING
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