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A kind of copolymerized polymer chelating flocculant and preparation method thereof

A polymer and flocculant technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water pollutants, etc., can solve the problems of slow sedimentation, weak chelation ability, small flocs, etc., and achieve less pollution , Enhanced chelating ability, thicker flocs

Active Publication Date: 2021-02-02
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently existing chelating agents, some of which form chelates are easily soluble in water, such as ammonia carboxyl complexing agents, typically such as EDTA; some form small flocs, such as small molecule chelating agents such as copper reagents; some chelating agents The complexing ability is relatively weak, such as citric acid, thiourea, etc.; some formed floc structure is loose, and the sedimentation is relatively slow, such as some chelating agents with multifunctional groups, such as polyethylene polyaminodithioformate

Method used

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  • A kind of copolymerized polymer chelating flocculant and preparation method thereof
  • A kind of copolymerized polymer chelating flocculant and preparation method thereof
  • A kind of copolymerized polymer chelating flocculant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Get the piperazine 2.16g that mass fraction is 99.5% and join in the three-necked bottle of 250mL band mechanical stirring, reflux condenser and dropping funnel, then add 108.0g dehydrated alcohol, after fully dissolving, add mass fraction is 5.9 mL of 95.0% triethylenetetramine, then heated up to 60°C, slowly added 2.97 mL of epichlorohydrin with a mass fraction of 99.0% dropwise within 30 minutes, and continued the reaction for 3 hours after the addition;

[0028] (2) The reaction mixture obtained in step (1) was rotary-evaporated at 60°C and -0.095MPa until no more solvent dripped out to obtain 10.37g of light yellow sticky substance; collected 96.3g of ethanol;

[0029] (3) Transfer the viscous matter obtained in step (2) into a 500mL three-necked bottle with mechanical stirring, reflux condenser and dropping funnel, add 207.4g of distilled water, stir to dissolve, and then add 6.875g with a mass fraction of 96.0% After dissolving, slowly add 9.18 mL of carbon d...

Embodiment 2

[0033](1) Take 2.16g of piperazine with a mass fraction of 99.5% and add it to a 250mL three-necked bottle with mechanical stirring, reflux condenser and dropping funnel, then add the 96.3g ethanol collected in Example 1, after fully dissolving, add 7.1mL of triethylenetetramine with a mass fraction of 95.0%, then raised the temperature to 65°C, slowly added 3.56mL of epichlorohydrin with a mass fraction of 99.0% dropwise within 35min, and continued the reaction for 2.5h after the addition;

[0034] (2) The reaction mixture obtained in step (1) was rotary-evaporated at 60°C and -0.095MPa until no more solvent dripped out to obtain 10.49g of light yellow viscous substance; 86.9g of ethanol was collected;

[0035] (3) Transfer the viscous matter obtained in step (2) into a 500mL three-necked bottle with mechanical stirring, reflux condenser and dropping funnel, add 262.3g of distilled water, stir to dissolve, and then add 8.625g of 96.0% mass fraction After dissolving, slowly ad...

Embodiment 3

[0037] (1) Take 2.16g of piperazine with a mass fraction of 99.5% and add it to a 250mL three-necked bottle with mechanical stirring, reflux condenser and dropping funnel, then add the 86.4g ethanol collected in Example 2, after fully dissolving, add 7.87mL of triethylenetetramine with a mass fraction of 95.0% was then heated up to 60°C, and 3.96mL of epichlorohydrin with a mass fraction of 99.0% was slowly added dropwise within 35min, and the reaction was continued for 2h after the addition;

[0038] (2) The reaction mixture obtained in step (1) was rotary-evaporated at 60°C and -0.095MPa until no more solvent dripped out to obtain 10.84g of light yellow sticky substance; collected 75.9g of ethanol;

[0039] (3) Transfer the viscous matter obtained in step (2) into a 500mL three-necked bottle with mechanical stirring, reflux condenser and dropping funnel, add 325.2g of distilled water, stir and dissolve, then add 10.83g of 96.0% mass fraction After dissolving sodium hydroxide...

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Abstract

The invention relates to a copolymerized polymer chelating flocculant and a preparation method thereof. It uses polyethylene polyamine and piperazine as raw materials, and introduces polyethylene polyamine containing active amino groups and piperazine ring with rigid structure into the polymer chain through epichlorohydrin under mild conditions , and then react with carbon disulfide and sodium hydroxide to insert the strong chelating group dithioformate into the molecular chain. The present invention introduces a rigid piperazine ring structure into the polymer chain, which effectively changes the molecular chain structure and the spatial distribution of the chelating group, thereby facilitating the coordination of the chelating group and the heavy metal ion, as well as the formation and The growth makes the flocs produced dense and coarse, which improves the chelation and flocculation ability of heavy metals and the separation performance of flocs. The method of the invention has simple technological process, mild technological control conditions, and is easy to control and realize; and the whole technological process is environmentally friendly, and has good popularization and application value.

Description

technical field [0001] The invention relates to the field of heavy metal wastewater treatment, in particular to a copolymerized polymer chelating flocculant and a preparation method thereof. Background technique [0002] Heavy metal pollution is currently the most serious pollution and one of the most difficult to deal with. Due to the rapid development of industry, the number of industries and fields involving heavy metals is increasing day by day, and the amount of heavy metal waste discharged is increasing day by day, which makes the ecological environment and human beings more and more exposed to the threat of heavy metals. Especially with the improvement of people's quality of life and level, the quality requirements for products continue to increase. Therefore, the types and quantities of additives added in the manufacturing and processing of these products continue to increase, making the composition of the discharged heavy metal wastewater more complicated. Treatment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56C08G73/06C02F101/20
CPCC02F1/56C02F2101/20C08G73/0633
Inventor 刘立华叶小倩蒋甜甜刘一达王群黄金美
Owner HUNAN UNIV OF SCI & TECH
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