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Biological-polysaccharide-based decoloring flocculation agent and preparation method thereof

A technology of decolorizing flocculant and biological polysaccharide, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc. It can solve the problems that the molecular weight and structural properties are difficult to meet the actual needs, and achieve good social and economic benefits, no secondary pollution, and a wide market foreground effect

Active Publication Date: 2016-03-02
威海汉邦生物环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when these materials are used, their molecular weight and structural properties are still difficult to meet the actual needs.

Method used

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  • Biological-polysaccharide-based decoloring flocculation agent and preparation method thereof
  • Biological-polysaccharide-based decoloring flocculation agent and preparation method thereof
  • Biological-polysaccharide-based decoloring flocculation agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of dicyandiamide-formaldehyde condensation polymer solution containing carbon-carbon double bonds at the end: In a four-necked flask equipped with an electric stirrer, a thermometer, and a reflux condenser, add 63g of dicyandiamide, 11.25g of urea, and 53.25g of acrylamide in sequence , 40.13g of ammonium chloride, 81.08g of 37% formaldehyde solution, the temperature of the water bath is controlled at 35-45°C, and the stirring is started. After it is completely dissolved, 11.25g of ethylenediamine is added. When it drops to 48°C, slowly add 40.54g of 37% formaldehyde solution dropwise, then raise the temperature to 66-68°C, keep it warm for 2 hours, take it out, and cool it down to obtain the product.

[0031] Dilute the above product into a 50% aqueous solution, take 50g of the solution and add it to a 500ml three-necked flask, then add 170g of a biological polysaccharide solution with a mass concentration of 15%, start stirring, and slowly heat up to 45°C, ...

Embodiment 2

[0033] Preparation of dicyandiamide-formaldehyde polycondensate solution containing carbon-carbon double bonds at the end: In a four-necked flask equipped with an electric stirrer, a thermometer, and a reflux condenser, add 69g of dicyandiamide, 12.33g of urea, and 58.32g of acrylamide in sequence , 26.39g of ammonium chloride, 100g of 37% formaldehyde solution, the temperature of the water bath is controlled at 45-50°C, and the stirring is started. After it is completely dissolved, 12.33g of ethylenediamine is added. When it reaches 50°C, slowly add 66.67g of 37% formaldehyde solution dropwise, then raise the temperature to 66-68°C, keep it warm for 2h, take it out, and cool it down to obtain the product.

[0034] Dilute the above product into a 50% aqueous solution, take 60g of the solution and add it to a 500ml three-necked flask, then add 100g of a biological polysaccharide solution with a mass concentration of 15%, start stirring, and slowly heat up to 50°C, and after pass...

Embodiment 3

[0036]Preparation of dicyandiamide-formaldehyde polycondensate solution containing carbon-carbon double bonds at the end: In a four-necked flask equipped with an electric stirrer, a thermometer, and a reflux condenser, add 123.34g of dicyandiamide, 15.42g of urea, and 104.3g of propylene in sequence Amide, 1.47mol of HCl, 100g of 37% formaldehyde solution, the temperature of the water bath is controlled at 35-45°C, and stirring is started. After it is completely dissolved, 15.42g of ethylenediamine is added. When it reaches 48°C, slowly add 66.67g of 37% formaldehyde solution dropwise, then raise the temperature to 66-68°C, keep it warm for 2 hours, take it out, and cool it down to obtain the product.

[0037] Dilute the above product into a 50% aqueous solution, take 20g of the solution and add it to a 500ml three-necked flask, then add 125g of a biological polysaccharide solution with a mass concentration of 8%, start stirring, and slowly heat up to 45°C, and after passing ni...

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Abstract

The present invention relates to a biological-polysaccharide-based decoloring flocculation agent and a preparation method thereof, and a large-scale produced non-toxic and degradable biological polysaccharide with the ultra-high molecular weight of 2 to 30 million is used as a basic skeleton for grafting and copolymerizing with a dicyandiamide-formaldehyde cationic polycondensate with a terminal carbon-carbon double bond to prepare the ultra-high molecular weight biological-polysaccharide-based decoloring flocculation agent with both decoloring and flocculation functions. The product is suitable for processing printing and dyeing wastewater large in changes in water quality, has good acid and heat resistant properties, and can make the CODcr removal rate in the water more than 80%, and the decolorization rate more than 93%. Compared with acrylamide and natural high polymer material flocculation agents, the biological-polysaccharide-based decoloring flocculation agent has more extensive market prospects and good social and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of polysaccharide biological flocculant modification technology, in particular to a biological polysaccharide-based decolorizing flocculant and a preparation method thereof. Background technique [0002] At present, dicyandiamide-formaldehyde decolorizing flocculants and cationic polyacrylamide decolorizing flocculants are mostly used in the treatment of printing and dyeing wastewater. The formed flocs are small and the sedimentation speed is slow, while the latter is just the opposite of the former, with good flocculation performance but poor decolorization performance. [0003] In order to achieve the purpose of decolorization and flocculation at the same time, the prior art combines polyacrylamide flocculant with dicyandiamide-formaldehyde decolorant to prepare a new type of decolorizing flocculant. For example, patent CN103304744A reports a two-phase decolorization Preparation process of flocculant emul...

Claims

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Application Information

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IPC IPC(8): C02F1/56C08G81/00
Inventor 庄茅胡阳倪小朋谭伟龙王晓东管涛陈亚红
Owner 威海汉邦生物环保科技股份有限公司
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