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Ethoxylated trimethylolpropane core hyperbranched polymer taking dithiocarboxylate as side group and end group and application of chelating metal

A technology for ethoxylated trimethylolpropane and dithiocarboxylate, applied in organic chemistry, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of reduced utilization efficiency of chelating groups, DTC Low group utilization efficiency, affecting flocculation and sedimentation performance, etc., to achieve good chemical stability, fast sedimentation rate, and strong stability

Active Publication Date: 2020-05-05
TONGJI UNIV
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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 , so that the flocs repel each other with excess negative charges, which in turn affects their flocculation and sedimentation performance, and it is still necessary to add a small amount of flocculant to aid sedimentation

Method used

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  • Ethoxylated trimethylolpropane core hyperbranched polymer taking dithiocarboxylate as side group and end group and application of chelating metal
  • Ethoxylated trimethylolpropane core hyperbranched polymer taking dithiocarboxylate as side group and end group and application of chelating metal
  • Ethoxylated trimethylolpropane core hyperbranched polymer taking dithiocarboxylate as side group and end group and application of chelating metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Under nitrogen protection, 36.00g (0.60mol) ethylenediamine (EDA) and 36.00g methanol are respectively added in the round bottom 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 85.60 g (0.10 mol, 50%) of a methanol solution of ethoxylated trimethylolpropane triacrylate (EO-TMPTA). 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 an intermediate: ethoxylated trimethylolpropane tri((N-( 2-aminoethyl))-3-aminopropionate) hyperbranched polymer (EO-TMPTA / EDA). Then, add 140.00g of deionized water, stir evenly, cool to 5°C, slowly add 48.00g (50%, 0.60mol) of sodium hydroxide aqueous solution through a constant pressure dr...

Embodiment 2

[0039] Under nitrogen protection, 48.00g (0.80mol) ethylenediamine (EDA) and 54.00g methanol were respectively added 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 85.60 g (0.10 mol, 50%) of a methanol solution of ethoxylated trimethylolpropane triacrylate (EO-TMPTA). After the dropwise addition was completed, the reaction was carried out at 25° C. for 20 hours. Then, under the condition of 95°C, distill under reduced pressure for 3 hours to distill off excess ethylenediamine and methanol to obtain a light amber viscous product, which is an intermediate: ethoxylated trimethylolpropane tri((N-( 2-aminoethyl))-3-aminopropionate) hyperbranched polymer (referred to as EO-TMPTA / EDA). Then, add 145.00g of deionized water, stir evenly, cool to 10°C, slowly add 49.60g (50%, 0.62mol) of sodium hydroxide aqueous solution through a co...

Embodiment 3

[0042] Under nitrogen protection, 18.00g (0.30mol) ethylenediamine (EDA) and 30.00g 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 42.80 g (0.05 mol, 50%) of a methanol solution of ethoxylated trimethylolpropane triacrylate (EO-TMPTA). 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 an intermediate: ethoxylated trimethylolpropane tri((N-( 2-aminoethyl))-3-aminopropionate) hyperbranched polymer (referred to as EO-TMPTA / EDA). Then, add 66.00g of deionized water, stir evenly, cool to 5°C, slowly add 24.00g (50%, 0.30mol) of sodium hydroxide aqueous solution through a cons...

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Abstract

The invention provides an ethoxylated trimethylolpropane core hyperbranched polymer taking dithiocarboxylate as a side group and an end group and a preparation method and application of the ethoxylated trimethylolpropane 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 trimethylolpropane core hyperbranched polymer taking dithiocarboxylate as a side group and an end group is CH3CH2C [CH2OCH2CH2OCOCH2CH2CH2N (CSSM) CH2CH2NHCSSM] 3, wherein M is Na<+>, K<+>or NH4<+>. The hyperbranched polymer provided by the invention is simple in preparation method, easily available in raw materials and easy to industrialize. The hyperbranched polymer can be used as aheavy metal chelating agent, the special three-dimensional space structure of the hyperbranched polymer can be alternately chelated with heavy metals to form a three-dimensional super-macromolecular combination with low solubility and strong stability, and wastewater and wastes containing heavy metals can be effectively treated.

Description

technical field [0001] The invention relates to the technical fields of chemical engineering and environmental protection, in particular to the application of an ethoxylated trimethylolpropane core hyperbranched polymer with dithiocarboxylate as side and end groups and a chelated metal. 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, revers...

Claims

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Application Information

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IPC IPC(8): C07C333/16A62D3/33C02F1/62
CPCA62D3/33C02F1/62C07C333/16
Inventor 郅玉声
Owner TONGJI UNIV
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