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Coagulation decolourant for printing and dyeing waste water

A technology for printing and dyeing wastewater and decolorizing agent, which is applied in the textile industry wastewater treatment, flocculation/sedimentation water/sewage treatment and other directions, can solve the problems of increasing free nitrogen content, high price of dicyandiamide, difficulty in promotion and use, etc. The effect of prolonging the reaction time and good decolorization effect

Inactive Publication Date: 2011-08-03
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual production and use, due to the high price of dicyandiamide and its high cost, it is difficult to popularize and use it.
In addition, free ammonium chloride and formaldehyde inevitably exist in dicyandiamide-formaldehyde polymers. The former will increase the free nitrogen content of the treated water, and the latter is harmful to the human body.

Method used

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  • Coagulation decolourant for printing and dyeing waste water
  • Coagulation decolourant for printing and dyeing waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Synthesis of A polymer:

[0046] Add 1 mol of dicyandiamide, 1.15 mol of ammonium chloride, 0.01 mol of catalyst urea, and 0.95 mol of formaldehyde into a three-necked round-bottomed flask equipped with a reflux condenser, slowly raise the temperature to 45°C, and slowly add another 0.95 mol of formaldehyde, and the addition is complete. Raise the temperature to 92°C, react for 6 hours, and adjust the pH to about 4.0 with sodium hydroxide. The obtained colorless viscous liquid is dicyandiamide-formaldehyde polymer, and its solid content is 58.2%.

[0047] Synthesis of B polymer:

[0048] Dissolve 4 mol of DADMAC monomer in 500 ml of water, control the temperature at 20° C., fill with nitrogen to obtain oxygen for 30 minutes, and use 15 g of ammonium persulfate as an initiator. Add 1molAM under nitrogen protection. After that, add 0.2molAM every 10 minutes until the addition is finished. A total of 2 mol AM was added. React at 70°C for 4 hours to obtain an aqueous so...

Embodiment 2

[0052] Synthesis of A polymer:

[0053] Add 1 mol of dicyandiamide, 1.175 mol of ammonium chloride, 0.01 mol of catalyst urea, and 1.019 mol of formaldehyde in a three-neck round bottom flask equipped with a reflux condenser, slowly raise the temperature to 45°C, slowly add another 1.0 mol of formaldehyde, and heat up after adding to 92°C, react for 7.5 hours, adjust the pH to about 4.0 with sodium hydroxide, and obtain a colorless viscous liquid dicyandiamide-formaldehyde polymer with a solid content of 58.8%;

[0054] Synthesis of B polymer:

[0055] Dissolve 2 mol of DADMAC monomer in 500 ml of water, control the temperature at 20°C, fill with nitrogen and oxygen for 30 minutes, and use 15 g of ammonium persulfate as an initiator. Add 1molAM under nitrogen protection. After that, add 0.1molAM every 10 minutes until the addition is finished. A total of 2 mol AM was added. React at 65°C for 4 hours to obtain an aqueous solution with a solid content of 20%, and add water t...

Embodiment 3

[0059] Synthesis of A polymer:

[0060] Add 1 mol of dicyandiamide, 1.60 mol of ammonium chloride, 0.01 mol of catalyst urea, and 0.7 mol of formaldehyde into a three-necked round-bottomed flask equipped with a reflux condenser, slowly raise the temperature to 45°C, and slowly add another 0.75 mol of ammonium chloride and another 0.5 mol formaldehyde, after adding, heat up to 90°C, react for 8 hours, adjust the pH to about 4.0 with sodium hydroxide, and the obtained product A polymer is a colorless viscous liquid with a solid content of 58.45%;

[0061] Synthesis of B polymer:

[0062]Dissolve 2.5 mol of DADMAC monomer in 300 ml of water, control the temperature at 25°C, fill with nitrogen and oxygen for 30 minutes, and use 15 g of ammonium persulfate as an initiator. Add 1molAM under nitrogen protection. After that, add 0.1molAM every 150 minutes until the addition is finished. A total of 2 mol AM was added. React at 65°C for 5 hours to obtain an aqueous solution with a s...

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Abstract

The invention relates to a wastewater processing technology in printing and dyeing industry, and is a novel coagulant formulation for decolourization of printing and dyeing water. The invention is practically a complex confected coagulate decoloring agent which is formed by using acrylamide-dimethyldiallylammonium chloride multipolymer as an additive to be mixed with dicyandiamide-formaldehyde polycondensate. The invention has the advantages of simple processing equipment, easy acquisition of raw materials and low costs. The coagulated decoloring agent formulation is applicable for wastewaterprocessing in printing and dyeing industry and the like, and decolorization ratio is more than 98 percent.

Description

technical field [0001] The invention relates to a compound printing and dyeing wastewater coagulation decolorizer, which belongs to the technical field of printing and dyeing wastewater decolorization treatment. Background technique [0002] The wastewater discharged from the printing and dyeing industry is a kind of industrial wastewater with high concentration and complex components. Governments all over the world have strict standards for the discharge of this type of wastewater. One of the main tasks of treating this type of wastewater is decolorization. At present, the conventional treatment agents are aluminum-based and iron-based coagulants. Not only the decolorization effect is not good, but also the metal aluminum is harmful to the human body and pollutes water quality. Coagulants of this particular type have little or no effective removal of hydrophilic reactive dyes. [0003] Dicyandiamide-formaldehyde polymer was first used as a color-fixing agent in printing an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F103/30
Inventor 吴范宏赵敏陈建中唐灵方向俞晓东
Owner EAST CHINA UNIV OF SCI & TECH
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