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Hydroximic acid-type polymeric flocculant for removing heavy metal ions in sewage

A polymer flocculant, heavy metal ion technology, applied in water/sewage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. Emission targets, the effect of reducing pollution

Inactive Publication Date: 2009-10-21
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, electroplating wastewater is treated by adding inorganic flocculants such as ferrous sulfate or polyferric acid and polyacrylic acid coagulant. The heavy metal content of the treated wastewater cannot meet the discharge standards stipulated by the state.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The three different structural segments of the flocculant in this example are: the first segment is acrylamide, N-18 alkyl acrylamide and methylol acrylamide; the second segment is methacrylic acid, propylene hydroxamic acid and 3-propenylpropanesulfonic acid; the third segment is butyl acrylate, 2-hydroxypropyl acrylate and hexadecyl acrylate.

[0018] Preparation: Take 125g of paraffin solvent oil (containing emulsifier Span80: 8.0g, Span85: 2.5g, PEG: 2.0g) with a boiling point of 200-380°C in a 1000ml beaker; take 102g of acrylamide, N-18 alkylacrylamide 4.0g, methylolacrylamide 6.0g, methacrylic acid 20g, acrylhydroxamic acid 28g, 3-propenylpropanesulfonic acid 1.5g, butyl acrylate 2.0g, 2-hydroxypropyl acrylate 2.0g, cetyl acrylate Put 1.0g of alkanes, 0.2g of EDTA-sodium salt, and 130g of water into a 500ml beaker, heat to dissolve fully, and then blow nitrogen. Add the aqueous solution into the oil and emulsify with a 10000-16000RPM high-speed mixer to prepare ...

Embodiment 2

[0021] The three different structural segments of the flocculant in this example are: the first segment is acrylamide, N-16 alkylacrylamide and methylol methacrylamide; the second segment is acrylic acid, methacryl hydroxime acid and 2-acrylamide-2-methylpropylsulfonic acid; the third segment is octyl acrylate, 2-methylaminopropyl acrylate and dodecyl acrylate.

[0022] Preparation: Take 125.0g of paraffin solvent oil with a boiling point of 200-380°C (including emulsifier Span80: 8.0g, Span85: 2.5g, PEG: 2.0g) in a 1000ml beaker; take 102.0g of acrylamide, N-16 alkyl Acrylamide 4.0g, methylolmethacrylamide 6.0g, acrylic acid 20.0g, methacryl hydroxamic acid 28.0g, 2-acrylamide-2-methylpropanesulfonic acid 1.5g, octyl acrylate 2.0g, acrylic acid Put 2.0g of 2-methylaminopropyl ester, 1.0g of lauryl acrylate, 0.2g of EDTA-sodium salt, and 130g of water into a 500ml beaker, heat to dissolve fully, and then pass nitrogen gas. Add the aqueous solution into the oil and emulsify wi...

Embodiment 3

[0025] The three different structural segments of the flocculant in this example are: the first segment is acrylamide, N-16 alkyl methacrylamide and methylol methacrylamide; the second segment is crotonic acid, formic acid Butene hydroxamic acid and vinylbenzene sulfonic acid; the third segment is 2-methacrylamidoethyl ethyl ester, 2-hydroxypropyl methacrylate and dodecyl acrylate.

[0026] Preparation: Take 125g of paraffin solvent oil (containing emulsifier Span80: 8.0g, Span85: 2.5g, PEG: 2.0g) with a boiling point of 200-380°C in a 1000ml beaker; take 102g of acrylamide, N-16 alkylmethyl Acrylamide 4.0g, methylol methacrylamide 6.0g, crotonic acid 20g, methylbutene hydroxamic acid 28g, vinylbenzenesulfonic acid 1.5g, 2-methacrylamido ethyl alcohol 2.0g, methyl Put 2-hydroxypropyl acrylate, 1.0 g of dodecyl acrylate, 0.2 g of EDTA-sodium salt, and 130 g of water into a 500-ml beaker, heat to dissolve fully, and then pass nitrogen gas. Add the aqueous solution into the oil ...

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Abstract

The invention provides a hydroximic acid-type polymeric flocculant for removing heavy metal ions in sewage and the macromolecule thereof has three chains of different structures; the first chain is at least one out of an acrylamide or a derivative thereof, wherein the total weight percentage of the monomer is 10-90wt%; the second chain is at least two out of a carboxylic acid, sulfonic acid and hydroximic acid compound, wherein the total weight percentage of the monomer is 5-60wt%; the third chain is at least one out of a sulfur-contained, oxygen-contained or amido-contained lipid compound, wherein the total weight percentage of the monomer is 1-20wt%. The flocculant can effectively remove the heavy metal ions in sewage of electroplating, electronic and heavy metal industries, such as iron, copper, zinc, chrome, nickel, and the like, and the removal rate is more than 98%.

Description

technical field [0001] The invention relates to a polymer flocculant, in particular to a hydroxamic acid polymer flocculant capable of removing divalent or more than divalent metal ions in sewage. Background technique [0002] Electroplating wastewater contains iron, zinc, copper, nickel, and chromium. It is a relatively difficult wastewater to treat. If it is not treated properly, it will pollute surface water. At present, electroplating wastewater is treated by adding inorganic flocculants such as ferrous sulfate or polyferric acid and polyacrylic acid coagulant. The heavy metal content of the treated wastewater cannot meet the national discharge standards. Contents of the invention [0003] The purpose of the present invention is to provide a hydroxamic acid polymer flocculant which is used for sewage treatment and can effectively remove heavy metal ions in sewage. [0004] The hydroxamic acid type macromolecule flocculant capable of removing heavy metal ions in sewage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F1/62
Inventor 孟勇尹笃林毛丽秋兰支利伏再辉肖毅徐琼
Owner HUNAN NORMAL UNIVERSITY
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