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Preparation method of flocculant for textile printing and dyeing wastewater decolorization

A decolorizing flocculant, textile printing and dyeing technology, applied in textile industry wastewater treatment, chemical instruments and methods, flocculation / sedimentation water / sewage treatment, etc. and other problems, to achieve high chromaticity and COD removal rate, low temperature storage stability, and the effect of reducing water content

Active Publication Date: 2019-01-29
ZIBO LURUI FINE CHEM CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, dicyandiamide formaldehyde resin is a kind of high-efficiency organic polymer decolorization flocculant, but the shortcomings of this product such as whitening at low temperature, stickiness and poor stability limit its application
In order to suppress the whitening and stickiness of the product, commercially available products usually choose to reduce the solid content to delay this process, which leads to an increase in the amount of the product and an increase in the cost of production, transportation and use
In order to reduce product cost and further improve product performance, some researchers have carried out many modifications to the dicyandiamide formaldehyde decolorizing flocculant, including replacing part of dicyandiamide with urea (Chinese invention patent CN1089958A), using starch and other modifiers to modify (Chinese invention patent CN102863065B), etc., but the problem of poor low temperature stability when the product has a high solid content (>55%) is still unsolved

Method used

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  • Preparation method of flocculant for textile printing and dyeing wastewater decolorization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1, concrete steps are:

[0014] 1) Add 105 kilograms of formaldehyde solution, 66 kilograms of dicyandiamide and 6.42 kilograms of ammonium chloride with a mass concentration of 37% in turn in the enamel kettle A equipped with a reflux condenser and coil heating / cooling, heat to 50 ° C and stir 30 minutes until the solution is transparent;

[0015] 2) Dissolve 15.95 kg of paraformaldehyde in 18.52 kg of NaOH solution with a concentration of 2-4mol / L in reactor B, heat to 60°C and stir to dissolve it;

[0016] 3) Add the solution obtained in step 2) into the enamel kettle A, make the pH of the solution in the enamel kettle A be 7.5±0.2, continue heating to 80°C for 1 hour;

[0017] 4) Add 25.68 kg of ammonium chloride into the enamel kettle A, keep the reaction at 80°C for 3 hours, let it cool down to room temperature after the reaction, and obtain the decolorizing flocculant for textile printing and dyeing wastewater.

Embodiment 2

[0019] 1) Add 125 kg of formaldehyde solution with a mass concentration of 37%, 75.6 kg of dicyandiamide and 8.0 kg of ammonium chloride in sequence in the enamel kettle A equipped with a reflux condenser and coil heating / cooling, heat to 45°C and stir 30 minutes until the solution is transparent;

[0020] 2) Dissolve 20.97 kg of paraformaldehyde in 23.1 kg of NaOH solution with a concentration of 2.5 mol / L in reactor B, heat to 65°C and stir to dissolve it;

[0021] 3) Add the solution obtained in step 2) into the enamel kettle A, so that the pH of the solution in the enamel kettle A is 7.5±0.2, and continue heating to 75° C. for 2 hours;

[0022] 4) Add 32 kg of ammonium chloride into the enamel kettle A, keep it at 75° C. for 2 hours, and let it cool down to room temperature after the reaction, to obtain the decolorizing flocculant for textile printing and dyeing wastewater.

Embodiment 3

[0024] 1) Add 136 kilograms of formaldehyde solution, 80 kilograms of dicyandiamide and 11.4 kilograms of ammonium chloride successively with a mass concentration of 37% in the enamel kettle A equipped with a reflux condenser and coil heating / cooling, heat to 45 ° C and stir 25 minutes until the solution is transparent;

[0025] 2) Dissolve 23.93 kg of paraformaldehyde in 25 kg of NaOH solution with a concentration of 3 mol / L in reactor B, heat to 70°C and stir to dissolve it;

[0026] 3) Add the solution obtained in step 2) into the enamel kettle A, make the pH of the solution in the enamel kettle A be 7.7±0.2, continue heating to 70°C for 2 hours;

[0027] 4) Add 34.2 kg of ammonium chloride into the enamel kettle A, keep the reaction at 70°C for 1 hour, and let it cool down to room temperature after the reaction, to obtain the decolorizing flocculant for textile printing and dyeing wastewater.

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Abstract

The invention provides a preparation method of a textile printing and dyeing wastewater decoloration flocculant. The preparation method comprises the following steps: adding 15-23% of formaldehyde solution at the mass concentration of 37%, 22-30% of dicyandiamide and 2-4.25% of ammonium chloride into an enamel kettle A in sequence, heating the mixture to 40-50 DEG C and stirring the mixture for 20-30 minutes; 2) dissolving 5-9% of paraformaldehyde in 6-9% of a NaOH solution at the concentration of 2-4 mol / L in a reaction kettle B, performing heating to 60-80 DEG C and performing stirring until the paraformaldehyde is dissolved in the solution; 3) adding the solution obtained in the step 2) into the enamel kettle A, performing heating to 60-80 DEG C, and conducting a reaction for 1-2 hours; and 4) adding 8-12.75% of ammonium chloride into the enamel kettle A, conducting a reaction at 60-80 DEG C for 1-3 hours, and allowing the reacted material to stand and cool to room temperature after the reaction is completed, so as to obtain the textile printing and dyeing wastewater decoloration flocculant. The prepared textile printing and dyeing wastewater decoloration flocculant is good in decoloration effects, COD removal effects and low-temperature storage stability.

Description

technical field [0001] The invention relates to a preparation method of a decolorizing flocculant for textile printing and dyeing wastewater, and belongs to the technical field of textile printing and dyeing wastewater treatment. Background technique [0002] Textile printing and dyeing wastewater has the characteristics of deep color, large water volume and complex composition, which is very harmful to the environment. National (GB4287-2012 "Discharge Standards of Water Pollutants for Textile Dyeing and Finishing Industry") and localities (such as DB37 / 533-2005 "Shandong Province Local Standards for Discharge Standards of Water Pollutants for Textile Dyeing and Finishing Industry") both regulate the chromaticity of the discharged printing and dyeing wastewater. , COD has strict requirements. Among the many methods of printing and dyeing wastewater treatment, adding a decolorizing flocculant for flocculation and sedimentation is a treatment method that can effectively reduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/54C02F1/56C02F103/30
CPCC02F1/5236C02F1/54C02F1/56C02F2103/30
Inventor 段红英王杨王方水任纪忠
Owner ZIBO LURUI FINE CHEM CO LTD
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