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Decolorizing coagulant as well as preparation method and uses thereof

A high-efficiency decolorizing flocculant and preparation process technology, applied in separation methods, chemical instruments and methods, flocculation/sedimentation water/sewage treatment, etc., can solve problems such as poor flocculation performance, few active adsorption points, and low average relative quality , to achieve low cost of use, good flocculation performance, and reduce production costs

Inactive Publication Date: 2008-09-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lignin can be directly used as a flocculant, but its flocculation performance is not good due to its low average relative mass and few active adsorption sites.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put 60g, 90g, 75g, 30g of lignin, dicyandiamide, formaldehyde and ammonium chloride into a reaction kettle equipped with a reflux condensing device, stir and mix evenly, and slowly raise the temperature to 55°C for polycondensation reaction. After the temperature change is stable, add the remaining 45g of formaldehyde, heat to control the reaction temperature at 65°C, continue the polycondensation reaction, keep the temperature for 6h, and then naturally cool to room temperature to obtain the product.

Embodiment 2

[0021] Put 45g, 100g, 85g, and 40g of lignin, dicyandiamide, formaldehyde, and ammonium chloride into a reaction kettle equipped with a reflux condensing device, stir and mix evenly, and slowly raise the temperature to 60°C for polycondensation. After the temperature change is stable, add the remaining 30g of formaldehyde, heat to control the reaction temperature at 80°C, continue the polycondensation reaction, keep the temperature for 4h, and then naturally cool to room temperature to obtain the product.

Embodiment 3

[0023] Put 30g, 110g, 95g, and 50g of lignin, dicyandiamide, formaldehyde, and ammonium chloride into a reaction kettle equipped with a reflux condensing device, stir and mix evenly, and slowly raise the temperature to 65°C for polycondensation. After the temperature change is stable, add the remaining 15g of formaldehyde, heat to control the reaction temperature at 95°C, continue the polycondensation reaction, keep the temperature for 2h, and then naturally cool to room temperature to obtain the product.

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PUM

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Abstract

The invention relates to an industrial waste treatment technology, in particular to a method for preparing an efficient decolorizing flocculant. Under the effect of a catalyzer, preliminary condensation polymerization is performed among lignin, dicyandiamide and a part of formaldehyde under a certain condition, a part of formaldehyde is mixed after the heat release of the reaction is stable, the temperature is controlled between 65 to 95 DEG C, and a product can be obtained after heat preservation is performed for 2 to 6 h. The catalyzer of the invention can be one or more of ammonium chloride, aluminium chloride, aluminium sulphate and alum. The process equipment of the invention is simple, the operation is secure and the cost is low. The product can be applied to the advanced treatment of the wastewater in dye, printing and dyeing, pulp and paper engineering industries, and the decolorization ratio can reach more than 95 percent.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, and in particular provides a lignin-modified dicyandiamide-formaldehyde decolorizing flocculant, its preparation method and its application in industrial wastewater treatment. Background technique [0002] Pulping, papermaking, printing and dyeing and other industrial wastewater has the characteristics of complex composition, high chroma, and large discharge volume, and has been difficult to be effectively treated for a long time. It is difficult to remove the chroma by using general flocculants, so it is particularly important to use efficient decolorizing flocculants. [0003] Dicyandiamide-formaldehyde polycondensate is a new type of high-efficiency decolorizing flocculant with high cationic charge density. It destabilizes and separates color-developing organic matter in wastewater through the effects of electrical neutralization, adsorption, and net capture and sweeping. , to a...

Claims

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Application Information

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IPC IPC(8): C02F1/54B01D21/01C02F103/30
Inventor 乔瑞平孙承林杨旭于永辉卢庆亮彭福勇
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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