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Ethoxylated pentaerythritol core hyperbranched polymer taking dithiocarboxylate as side group and end group and application of ethoxylated pentaerythritol core hyperbranched polymer in chelating heavy metals

A dithiocarboxylate, hyperbranched polymer technology, applied in water pollutants, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of reduced chelating group utilization efficiency, DTC group Low utilization efficiency, affecting flocculation and sedimentation performance, etc., to achieve good chemical stability, large flocs, and improve sedimentation rate and effect.

Active Publication Date: 2020-04-28
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large molecular weight and multiple DTC groups on the molecular chain, it can quickly flocculate after chelating with heavy metals to form large, dense, fast-settling, and easy-to-separate deposits, showing good flocculation, but the linear polymer chain is due to Large molecular weight, easy to curl, its DTC group can not be fully exposed to produce steric hindrance, the utilization efficiency of DTC group is low, and the dosage of the drug is large; in addition, the steric hindrance of the polymer chain reduces the utilization efficiency of the chelating group , causing the flocs to repel each other with excess negative charges, which in turn affects their flocculation and sedimentation performance

Method used

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  • Ethoxylated pentaerythritol core hyperbranched polymer taking dithiocarboxylate as side group and end group and application of ethoxylated pentaerythritol core hyperbranched polymer in chelating heavy metals
  • Ethoxylated pentaerythritol core hyperbranched polymer taking dithiocarboxylate as side group and end group and application of ethoxylated pentaerythritol core hyperbranched polymer in chelating heavy metals
  • Ethoxylated pentaerythritol core hyperbranched polymer taking dithiocarboxylate as side group and end group and application of ethoxylated pentaerythritol core hyperbranched polymer in chelating heavy metals

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Under nitrogen protection, 48.00g (0.80mol) ethylenediamine (EDA) and 48.00g methanol were added respectively in the round bottom flask with stirring, reflux condenser, constant pressure dropping funnel and thermometer, started stirring and cooled to 5° C.; then through the dropping funnel, slowly dropwise add 105.60 g (0.10 mol, 50%) of a methanol solution of ethoxylated pentaerythritol tetraacrylate (EO-PETA). After the dropwise addition was completed, the reaction was carried out at 25° C. for 24 hours. Then, at 90°C, distilled under reduced pressure for 4 hours to distill off excess ethylenediamine and methanol to obtain a light amber viscous product, which is the intermediate - ethoxylated pentaerythritol tetrakis ((N-(2-aminoethyl) Base))-3-aminopropionate) hyperbranched polymer (referred to as EO-PETA / EDA). Then, add 200.00g deionized water to the intermediate, stir evenly, cool to 5°C, slowly add 64.00g (50%, 0.80mol) of sodium hydroxide aqueous solution throug...

Embodiment 2

[0040] Under nitrogen protection, 60.00g (1.0mol) ethylenediamine (EDA) and 60.00g methanol were added respectively in the round bottom flask with stirring, reflux condenser, constant pressure dropping funnel and thermometer, started stirring and cooled to 5° C.; then through the dropping funnel, slowly dropwise add 105.60 g (0.10 mol, 50%) of a methanol solution of ethoxylated pentaerythritol tetraacrylate (EO-PETA). After the dropwise addition was completed, the reaction was carried out at 25° C. for 24 hours. Then, under the condition of 95°C, distill under reduced pressure for 4 hours to distill off excess ethylenediamine and methanol to obtain a light amber viscous product, which is the intermediate-ethoxylated pentaerythritol tetrakis((N-(2-aminoethyl Base))-3-aminopropionate) hyperbranched polymer (referred to as EO-PETA / EDA). Then, add 195.00g deionized water in the intermediate, stir evenly, be cooled to 5 ℃, slowly add the sodium hydroxide aqueous solution of 68.00g...

Embodiment 3

[0043] Under nitrogen protection, 30.00g (0.50mol) ethylenediamine (EDA) and 32.40g ethanol are respectively added in the round-bottomed flask with stirring, reflux condenser, constant pressure dropping funnel and thermometer, start stirring and cooling to 5° C.; then through the dropping funnel, slowly dropwise add 52.80 g (0.05 mol, 50%) of an ethanol solution of ethoxylated pentaerythritol tetraacrylate (EO-PETA). After the dropwise addition was completed, the reaction was carried out at 25° C. for 24 hours. Then, under the condition of 95°C, distill under reduced pressure for 4 hours to distill off excess ethylenediamine and ethanol to obtain a light amber viscous product, which is an intermediate: ethoxylated pentaerythritol tetrakis((N-(2-aminoethyl Base))-3-aminopropionate) hyperbranched polymer (referred to as EO-PETA / EDA). Then, add 125.00g deionized water in the intermediate, stir evenly, be cooled to 5 ℃, slowly add the sodium hydroxide aqueous solution of 32.80g (...

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Abstract

The invention provides an ethoxylated pentaerythritol core hyperbranched polymer taking dithiocarboxylate as a side group and an end group and application of the ethoxylated pentaerythritol core hyperbranched polymer as a heavy metal chelating agent, and relates to the technical field of chemical engineering and environmental protection. The chemical formula of the ethoxylated pentaerythritol corehyperbranched polymer is C[CH2OCH2CH2OCOCH2CH2N(CSSM)CH2CH2NHCSSM]4, wherein M is Na < + >, K < + > or NH4 < + >. The preparation method of the hyperbranched polymer is simple, raw materials are easyto obtain, and industrialization is easy. The hyperbranched polymer can be used as a heavy metal chelating agent, a special three-dimensional space structure of the hyperbranched polymer can be alternately chelated with heavy metals to form a compact ultra-large three-dimensional molecular combination with low solubility and strong stability, and wastewater and wastes containing the heavy metalscan be effectively treated.

Description

technical field [0001] The invention relates to the technical fields of chemical engineering and environmental protection, in particular to an ethoxylated pentaerythritol core hyperbranched polymer with dithiocarboxylate as side and end groups and its application for chelating heavy metals. Background technique [0002] In recent years, heavy metal pollution has become the most important environmental crisis in China, posing a serious threat to the ecosystem and public health. Incidents such as "arsenic poisoning", "blood lead" and "cadmium rice" have occurred frequently, making heavy metal pollution the most serious environmental crisis. One of the public events of concern. With the strengthening of supervision, solving heavy metal pollution has become an urgent environmental protection demand. [0003] Heavy metal wastewater treatment technologies mainly include neutralization precipitation method, chelation precipitation method, adsorption method, ion exchange method, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C02F1/56D06M101/20
CPCC08G83/005C02F1/56C02F2101/20C08G83/006C02F1/5272
Inventor 张冰如李风亭崔进
Owner TONGJI UNIV
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