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

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...

Examples

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...

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...

Examples

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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