Preparation process of double aqueous phase decoloring flocculant emulsion

A decolorizing flocculant and a preparation process technology are applied in the field of preparation technology of a two-phase decolorizing flocculant emulsion, which can solve the problems of poor comprehensive performance of decolorization and flocculation, and achieve the effect of simple preparation process.

Active Publication Date: 2013-09-18
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcoming of poor comprehensive performance of decolorization and flocculation of existing decolorization agents, and provide a kind of two-p...

Method used

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  • Preparation process of double aqueous phase decoloring flocculant emulsion
  • Preparation process of double aqueous phase decoloring flocculant emulsion
  • Preparation process of double aqueous phase decoloring flocculant emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of dicyandiamide formaldehyde condensation polymer:

[0030] Add 21.02g (0.25mol) of dicyandiamide and 35.9ml of 37-40wt% (0.50mol) formaldehyde solution into a three-neck round bottom flask equipped with a reflux condensing device, adjust the temperature of the water bath to 80°C, and react at constant temperature for 1 hour. Then, add 6.42g (0.12mol) of modifier ammonium chloride and 4.00g (0.03mol) of catalyst aluminum trichloride in sequence, adjust and keep the water bath temperature at 70°C, and react for 1.4h to obtain dicyandiamide formaldehyde condensation polymer aqueous solution .

[0031] Depend on figure 1 The infrared spectrum analysis is as follows: interval 4000~2500cm -1 It is the stretching vibration region of X-H (X includes C, N, O, S, etc.). Since the reactant is an amine compound, it should be the N-H stretching vibration line, so it can be judged that the product contains primary or secondary amine groups; 2500~2000cm -1 It is ...

Embodiment 2

[0039] (1) Preparation of dicyandiamide formaldehyde condensation polymer:

[0040] Add 21.02g (0.25mol) of dicyandiamide and 28.0ml of formaldehyde solution with a mass concentration of 37 to 40wt% (0.39mol) into a three-neck round bottom flask equipped with a reflux condensing device, adjust the temperature of the water bath to 80°C, and react at a constant temperature 1h. Then, add 4.28g (0.08mol) of modifier ammonium chloride and 5.33g (0.04mol) of catalyst aluminum trichloride in sequence, adjust and keep the water bath temperature at 65°C, and react for 1.2h to obtain dicyandiamide formaldehyde condensation polymer solution .

[0041] (2) Preparation of two-phase decolorizing flocculant emulsion

[0042] Taking the mass of the reaction system solution as the total mass, and using 60.00 g of the dicyandiamide formaldehyde condensation polymer aqueous solution prepared above as the dispersion medium, the dicyandiamide formaldehyde condensation polymer mass accounts for 4...

Embodiment 3

[0047] (1) Preparation of dicyandiamide formaldehyde polycondensate

[0048] Add 31.11g (0.37mol) of dicyandiamide and 53.8ml of formaldehyde solution with a mass concentration of 37-40wt% (0.75mol) into a three-necked round-bottomed flask equipped with a reflux condensing device, adjust the temperature of the water bath to 75°C, and react at a constant temperature 1h. Then, add modifier ammonium chloride 11.77g (0.22mol) and catalyst aluminum trichloride 4.00g (0.03mol) in sequence, adjust and keep the water bath temperature at 60°C, and react for 1.4h to obtain dicyandiamide formaldehyde condensation polymer solution .

[0049] (2) Preparation of two-phase decolorizing flocculant emulsion

[0050] Taking the mass of the reaction system solution as the total mass, and taking 105.00 g of the self-made dicyandiamide formaldehyde condensation polymer aqueous solution as the dispersion medium, the dicyandiamide formaldehyde condensation polymer mass accounts for 45.9wt% of the ...

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Abstract

The invention discloses a preparation process of a double aqueous phase decoloring flocculant emulsion. The process comprises the following steps: first, adding dicyandiamide and formalin with mass concentration of 37-40% into a container, heating to 75-80 DEG C, maintaining constant temperature of water bath, and stirring and reacting for 0.8-1.5 hours; adding a modifier ammonium chloride and a catalyst aluminum trichloride, adjusting and maintaining the temperature of water bath at 60-70 DEG C, and reacting for 1.2-1.4 hours to obtain a dicyandiamide formaldehyde polycondensate; and with dicyandiamide formaldehyde polycondensate aqueous liquor as a dispersing medium, adding acrylamide or then adding acrylic acid, a cationic monomer and a chain transfer agent isopropanol, stirring and dissolving to obtain liquor with a homogeneous phase, introducing nitrogen and removing oxygen for 10-20 minutes, then adding an initiator, and reacting for 6-16 hours at the water bath temperature of 30-50 DEG C to obtain the double aqueous phase decoloring flocculant emulsion. The preparation process disclosed by the invention is simple in equipment, and the decoloring rate of the prepared decoloring flocculant used for simulating dye wastewater treatment reaches over 93%.

Description

technical field [0001] The invention relates to a flocculant, in particular to a preparation process of a two-phase decolorizing flocculant emulsion, and the flocculant is mainly used for decolorization treatment of printing and dyeing wastewater. Background technique [0002] my country's dye output has ranked first in the world, with an annual output of 900,000 tons, accounting for 60% of the world's dye output. Due to the long dye production process and low product yield, usually 10-15% of the dye enters the environment through wastewater. my country is also the largest country in the textile printing and dyeing industry. The textile industry is a traditional pillar industry in my country, and the printing and dyeing industry accounts for a large proportion of the textile industry. According to statistics, about 80% of textile wastewater comes from the printing and dyeing industry. In our country, there are 6~7×10 8 Tons of printing and dyeing wastewater are discharged...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F220/06C08F220/56C08F226/02C08F220/34C08F2/10C08G12/40C08G12/16C02F1/56
Inventor 彭晓宏吉春艳杨俊峰谌小奇李宇
Owner SOUTH CHINA UNIV OF TECH
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