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Chelating agent capable of simultaneously processing multiple heavy metallic ions

A technology for simultaneous treatment of heavy metal ions, applied in water/sewage treatment, water/sludge/sewage treatment, organic chemistry, etc. The effect of content

Inactive Publication Date: 2007-12-05
TIANJIN RUIJI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the application practice, it is found that the neutralization precipitation method and the sulfide precipitation method have certain defects. First, the treatment of copper ions by the neutralization precipitation method needs to be realized when the pH is ≥ 11, and the reagents required to change the pH value when dealing with a large amount of ion content Large dosage, economically unreasonable
Secondly, in order to improve the cleanliness of products in the production process of electronic chemicals, some chemicals can react with some specific ions in organic matter to form complexes that cannot be treated by neutralization and precipitation, although it is possible to use sulfide precipitation to treat them These complexes, but in industrial practice, it has been found that the sulfide precipitates generated by the sulfide precipitation method have a small particle size and are difficult to separate and remove

Method used

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  • Chelating agent capable of simultaneously processing multiple heavy metallic ions
  • Chelating agent capable of simultaneously processing multiple heavy metallic ions
  • Chelating agent capable of simultaneously processing multiple heavy metallic ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh the polyethyleneimine and separate it, select 200g of polyethyleneimine with n equal to 6-20, 1000ml of 15% sodium hydroxide, put it into the reaction bottle at 20°C, add 120g of carbon disulfide dropwise, and stir for 30 minutes to precipitate a solid. Filter, wash with deionized water and drain to obtain a solid product. The product was analyzed by infrared spectroscopy to be sodium polythiocarbamate.

Embodiment 2

[0032] Weigh the polyethyleneimine and separate it, select 200g of polyethyleneimine with n equal to 6-20, 1000ml of 15% sodium hydroxide, put it into the reaction bottle at 15°C, add 200g of carbon disulfide dropwise, and stir for 30 minutes to precipitate a solid. Filter, wash with deionized water and drain to obtain a solid product. The product was analyzed by infrared spectroscopy to be sodium polythiocarbamate.

Embodiment 3

[0034] Weigh the polyethyleneimine and separate it, select 200g of polyethyleneimine with n equal to 6-20, 1000ml of 15% sodium hydroxide, put it into the reaction bottle at 15°C, add 300g of carbon disulfide dropwise, and stir for 45 minutes to precipitate a solid. Filter, wash with deionized water and drain to obtain a solid product. The product was analyzed by infrared spectroscopy to be sodium polythiocarbamate.

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Abstract

The present invention discloses one kind of chelating agent capable of treating several kinds of metal ion simultaneously. The chelating agent is synthesized with polyamine or polyethylene imine as basic skeleton and carbon disulfide in alkaline condition, where, polyamine or polyethylene imine and carbon disulfide have weight ratio of 1 to 0.6-2.0. The chelating agent of the present invention can form chelate precipitate simultaneously with several kinds of metal ion, and is especially suitable for use in purifying waste water, chemical intermediate and chemicals for printed circuit board containing metal ions.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a stable polymer chelating agent, more specifically a chelating agent capable of simultaneously treating multiple metal ions. Background technique [0002] At present, the methods for removing or reducing the content of metal ions include chemical treatment, ion exchange, electrolysis, adsorption, reverse osmosis, electrodialysis, evaporation concentration and biological treatment, etc., but due to economic reasons, it is often used Chemical treatment, including under certain conditions, metal ions and OH - The reaction produces hydroxides which are insoluble or slightly soluble in water. The neutralization precipitation method of precipitation and the sulfide precipitation method of reacting with S to form water-insoluble metal sulfide precipitation, etc. In the application practice, it is found that the neutralization precipitation method and the sulfide precipi...

Claims

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Application Information

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IPC IPC(8): C07C333/16C02F1/62
Inventor 朱其军王家喜李昆鹏
Owner TIANJIN RUIJI CHEM
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