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Polyamide tree-like heavy metal chelating agent and preparation method thereof

A technology of heavy metal chelating agent and polyamide, which is applied in the protection device against harmful chemicals, etc., can solve the problems of weak resistance to acid and alkali impact, weak long-term stability of heavy metal precipitates, etc., and achieve high long-term stability, excellent resistance The effect of acid-base shock capacity

Active Publication Date: 2015-03-25
宝武集团环境资源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of weak acid and alkali impact resistance and weak long-term stability of heavy metal precipitates in the environment during the treatment of heavy metals in solid waste, the present invention provides a polyamide dendritic heavy metal chelating agent and a preparation method thereof, It can be used in the range of pH 1-14, has extremely high acid and alkali impact resistance and long-term stability, and the heavy metal complex or chelate formed by the polyamide dendritic heavy metal chelating agent and heavy metal has long-lasting stability, can be Effectively reduce or even eliminate the risk of secondary pollution of heavy metals in solid waste

Method used

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  • Polyamide tree-like heavy metal chelating agent and preparation method thereof
  • Polyamide tree-like heavy metal chelating agent and preparation method thereof
  • Polyamide tree-like heavy metal chelating agent and preparation method thereof

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Embodiment 1

[0083] The preparation method of embodiment 1 polyamide dendritic heavy metal chelating agent of the present invention, comprises the following steps:

[0084] 1) At 0°C, dissolve cyanuric chloride into a mixed solution of potassium carbonate and acetonitrile in the reactor, and then add diethyl iminodiacetate dropwise in the reactor, wherein cyanuric chloride, carbonic acid The molar ratio of potassium to diethyl iminodiacetate is 15-20:1:50-60, and the stirring is continued for 25-40 minutes, the temperature is raised to 20-25°C for 3-4 hours, heated to reflux, and the reaction is 6-7 hours. Take solid by filtration under reduced pressure, obtain carboxylate intermediate I, reaction formula is as follows:

[0085]

[0086] 2) The obtained carboxylate intermediate was washed with distilled water for 2 to 3 times, cooled to room temperature, filtered, dried, and the precipitate was slowly dissolved in methanol.

[0087] 3) Slowly add the methanol solution in step 2) dropwi...

Embodiment 2

[0105] Embodiment 2 The polyamide dendritic heavy metal chelating agent of the present invention is that the preparation method of the dendritic molecular structure with only three linear branches is as follows:

[0106] 1) Preparation of carboxylate intermediate

[0107] Use cyanuric chloride, potassium carbonate and ethyl aminoacetate as raw materials, the molar ratio of which is 15-20:1:50-60, stir for 25-40 minutes, heat up to 20°C-25°C for 3-4 hours, heat to Reflux, react for 6 to 7 hours, filter under reduced pressure to take the solid, wash the solid with distilled water 2 to 3 times, filter and dry to obtain the carboxylate intermediate;

[0108] 2) Preparation of polyamide intermediate

[0109] Dissolve the obtained carboxylate intermediate in methanol, then dropwise add it to the methanol solution of anhydrous ethylenediamine, raise the temperature to 50-55°C for 10-14 hours, and distill under reduced pressure to obtain a solid, which is The polyamide intermediate ...

Embodiment 3

[0124] Example 3 Stabilization treatment of heavy metal dust in a waste incineration power plant along the coast

[0125] Directly add 3g sodium sulfide, 3g thiourea and 3g product 1 of the present invention respectively in the flue gas dedusting ash of certain waste incineration power plant along the coast of 100g (structural formula sees figure 2 ), add 28g of water and stir evenly to make a solidified body of dedusting ash, and stand still for 24h under natural conditions. Then the dedusting ash solidified body was leached according to HJ / T300-2007 (Solid Waste Heavy Metal Leach Toxic Acetic Acid Buffer Solution Method), and the data are shown in Table 1.

[0126] Table 1 Leach toxicity of heavy metal dust after stabilization treatment in a coastal waste incineration power plant

[0127] indicators

[0128] As can be seen from the data in Table 1, the heavy metal leaching concentration in the flue gas dedusting ash after the product treatment of the present inve...

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Abstract

The invention discloses a polyamide tree-like heavy metal chelating agent and a preparation method thereof. The polyamide tree-like heavy metal chelating agent is a tree-like organic compound with variant fractal side chain or a linear side chain adopting a trimerization triazine ring as an inner core, and polyamide with dithiocarboxylic acid groups as the fractal side chain, and with aminothiocarboxylate at the tail of the side chain; the polyamide tree-like heavy metal chelating agent can be used in the range of pH 1-14, has extremely high acid and alkali resistant capacity and long-term stability; and the heavy metal clathrate or chelate formed by the polyamide tree-like heavy metal chelating agent and heavy metal has durable stability, and the secondary pollution risk of the heavy metal in solid waste can be effectively reduced even completely eradicated.

Description

technical field [0001] The invention relates to the field of heavy metal treatment of solid waste, in particular to a polyamide dendritic heavy metal chelating agent and a preparation method thereof. Background technique [0002] Heavy metal pollution has become the most serious problem in my country's environmental pollution control. The treatment of heavy metal pollution in solid waste such as soil, dust, tailings and industrial waste residues is particularly urgent, and the technical difficulty of disposal is much higher than that of heavy metal wastewater treatment. [0003] Heavy metals in solid waste not only have a certain degree of concealment, but also have potential mobility, which can be released due to changes in the environment, causing serious secondary pollution. However, the physical properties of the above-mentioned solid wastes vary greatly. For example, industrial waste residues may be strongly acidic (pH<2) or strongly alkaline (pH>13). In order to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33C08G83/00A62D101/43
CPCA62D3/33A62D2101/43C08G83/003
Inventor 胡竹云卢四平秦晓东程远芳姚兰陈兴海季玉玄
Owner 宝武集团环境资源科技有限公司
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