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Novel decolorizing agent and preparation method thereof

A decolorizing agent, a new type of technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of small molecular weight, low cationic degree, etc., achieve the effect of simplifying operation procedures, shortening process flow, and saving treatment costs

Inactive Publication Date: 2012-07-11
JIANGMEN CITY ZHONGDA ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the traditional dicyandiamide formaldehyde polycondensate itself with small molecular weight and low cationicity, the invention provides a new type of dyeing and decolorizing agent and its preparation method

Method used

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  • Novel decolorizing agent and preparation method thereof

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Embodiment 1

[0038] The preparation of embodiment 1 novel decolorizing agent

[0039] 1. Synthesis of component A:

[0040] Add 1.6mol of industrial formaldehyde, 0.3mol of urea, and 1mol of dicyandiamide into a three-necked round-bottomed flask equipped with a serpentine reflux tube, start stirring and heat the system to 50°C, slowly add 0.75mol of ammonium chloride, and the reaction system will automatically heat up React at 85-90°C for 60 minutes, when the temperature of the reaction system drops to 70°C, add the remaining 0.25mol ammonium chloride and react naturally for 30 minutes, then add 0.05mol aluminum trichloride and 0.01mol calcium chloride, and continue the reaction for 30 minutes , that is, to obtain the compound type dicyandiamide formaldehyde condensation polymer of A component.

[0041] 2. Synthesis of component B:

[0042] Add 1.0 mol of epichlorohydrin to the reactor with stirring and heating functions, and evenly add 0.5 mol of diethylenetriamine dropwise under stir...

Embodiment 2

[0045] The preparation of embodiment 2 novel decolorizing agent

[0046] 1. Synthesis of component A:

[0047] Add 1.9mol industrial formaldehyde, 0.5mol urea, and 1mol dicyandiamide to a three-necked round-bottomed flask equipped with a serpentine reflux tube, start stirring and heat the system to 50°C, slowly add 0.9mol ammonium chloride, and the reaction system will automatically heat up React at 85-90°C for 60 minutes, when the temperature of the reaction system drops to 70°C, add the remaining 0.3mol ammonium chloride and react naturally for 30 minutes, then add 0.05mol aluminum trichloride and 0.01mol calcium chloride, and continue the reaction for 30 minutes , that is, to obtain the compound type dicyandiamide formaldehyde condensation polymer of A component.

[0048] 2. Synthesis of component B:

[0049] Add 1.0 mol of epichlorohydrin to the reactor with stirring and heating functions, and evenly add 1.0 mol of diethylenetriamine dropwise under stirring, then dropw...

Embodiment 3

[0052] The preparation of embodiment 3 novel decolorizing agent

[0053] 1. Synthesis of component A:

[0054] Add 2.0mol of industrial formaldehyde, 0.9mol of urea, and 1mol of dicyandiamide into a three-necked round-bottomed flask equipped with a serpentine reflux tube, start stirring and heat the system to 50°C, slowly add 1.125mol of ammonium chloride, and the reaction system will automatically heat up React at 85-90°C for 60 minutes, when the temperature of the reaction system drops to 70°C, add the remaining 0.375mol ammonium chloride and react naturally for 30 minutes, then add 0.05mol aluminum trichloride and 0.01mol calcium chloride, and continue the reaction for 30 minutes , that is, to obtain the compound type dicyandiamide formaldehyde condensation polymer of A component.

[0055] 2. Synthesis of component B:

[0056] Add 1.0 mol of epichlorohydrin to the reactor with stirring and heating functions, and evenly add 0.8 mol of diethylenetriamine dropwise under st...

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Abstract

The invention discloses a novel decolorizing agent. The novel decolorizing agent is formed by copolymerizing dicyandiamide formaldehyde polymer and polyepichlorohydrin amine resin. Compared with the conventional dicyandiamide formaldehyde decolorizing agent, the novel decolorizing agent has the advantages that: the molecular weight and the cation degree are greatly improved, so that the decolorizing effect of polymer is improved; and a decolorizing function can be realized by only using the decolorizing agent independently without additional aluminum-based coagulants and iron-based coagulants, so that a coagulation process flow is shortened, a water treatment operation process is simplified, and the treatment cost of dyed wastewater is saved. In addition, the novel decolorizing agent is used as a high-efficient water treatment medicament and can be widely applied to decolorizing treatment of all kinds of dyed wastewater.

Description

technical field [0001] The invention relates to a novel decolorizing agent and a preparation method thereof, in particular to a water-soluble amino resin and epichlorohydrin amine copolymerized organic cationic decolorizing agent and a preparation method thereof. Background technique [0002] In industrial wastewater, high-chroma textile printing and dyeing wastewater, leather dyeing wastewater, papermaking wastewater, etc. are all highly chromatic due to the addition of various dyes and substances containing chromophoric groups in the water, which are extremely difficult to be directly biochemically degraded. It must undergo coagulation decolorization or coagulation air flotation pretreatment and decolorization before entering the subsequent biochemical treatment system. General polymeric aluminum, polymeric iron or aluminum-iron composite water purifiers cannot achieve a good decolorization effect, especially when dealing with highly hydrophilic reactive dye wastewater, al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56
Inventor 董申伟
Owner JIANGMEN CITY ZHONGDA ENVIRONMENTAL PROTECTION TECH
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