Cationic dextran-based polymer and preparation thereof, and applications as flocculant

A dextran-based, cationic technology, which is applied in the field of cationic dextran derivative flocculants and its preparation, can solve secondary pollution, environmental problems, etc., achieve improved flocculation efficiency, simple operation steps, and good biodegradability and biocompatibility effects

Inactive Publication Date: 2019-11-12
安徽春霖环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past few decades, inorganic flocculants (aluminum salts and iron salts, etc.) and some synthetic organic polymers (such as polyacrylamide) have been widely used in the flocculation process, but they have also caused serious secondary pollution. and new environmental issues

Method used

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  • Cationic dextran-based polymer and preparation thereof, and applications as flocculant
  • Cationic dextran-based polymer and preparation thereof, and applications as flocculant
  • Cationic dextran-based polymer and preparation thereof, and applications as flocculant

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Embodiment 1

[0026] First, prepare 0.58mol / L sucrose solution with acetic acid-calcium acetate buffer solution with pH=5.4, and carry out catalytic fermentation reaction with 5.0U / mL dextran sucrase in T=25℃ water bath for 24 hours. , react until the dynamic viscosity reaches 8000CPS, adopt ethanol to precipitate high molecular weight dextran and dissolve it in water after washing 2-3 times to obtain a polymer dextran solution with a solid content of 5-10%; then the obtained dextran solution (about 100mL) Stir in the 250mL three-necked reaction bottle that has mechanical stirring device and make it dissolve fully; Then the potassium persulfate (as free radical initiator initiation system) of 3% mass content is slowly added in the three-necked bottle, at T=60 Initiate at ℃ for 15 minutes; then add METAC monomer according to the reaction molar ratio of cationic monomer 2-(methacryloyloxy)-ethyltrimethylammonium chloride (METAC) and dextran is 3:1 (mol / mol) , Stir the polymerization reaction ...

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Abstract

The invention discloses a cationic dextran-based polymer preparation method, which comprises: adding potassium persulfate to a dextran solution under an oxygen-free condition, stirring for 15-20 min,adding METAC, carrying out a reaction for 2-4 h at a temperature of 65-75 DEG C, adding ethanol to obtain a precipitate, purifying, washing, and drying to obtain white dry solid particles, ie., the cationic dextran-based polymer, wherein a sucrose solution is subjected to an enzyme-catalyzed fermentation reaction with dextran sucrose to obtain the dextran solution. Compared with the commercially available organic flocculant, the flocculating agent of the invention is safe, non-toxic and pollution-free, does not contain environmentally harmful components, and achieves the industrial productionand application of environmentally-friendly bioflocculants; and based on the basic skeleton structure of the biopolymer, the grafted derivative can be regenerated, and has good biodegradability and good biocompatibility so as to meet the ecological concept of sustainable development.

Description

technical field [0001] The invention relates to the field of biological polysaccharide-based flocculants, in particular to a cationic dextran derivative flocculant and a preparation method thereof. Background technique [0002] With the rapid development of industry and the growth of population, more and more surface water and groundwater are polluted to varying degrees. The deterioration of water quality and the shortage of water resources have become huge problems that urgently need to be solved in today's society. In the field of water treatment, flocculation technology is the most widely used and most critical step, and the flocculation efficiency mainly depends on the choice of flocculant type. In the past few decades, inorganic flocculants (aluminum salts and iron salts, etc.) and some synthetic organic polymers (such as polyacrylamide) have been widely used in the flocculation process, but they have also caused serious secondary pollution. and new environmental probl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/34C02F1/56
CPCC02F1/56C08F251/00C08F220/34
Inventor 张洪斌斯春林杨红兵李君
Owner 安徽春霖环保科技有限公司
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