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Composite heavy metal stabilizing agent containing dithiocarboxylic acid functional star-like super-branched polymer, preparation method and application method thereof

A technology of hyperbranched polymers and heavy metal stabilizers, applied in chemical instruments and methods, solid waste removal, water/sewage treatment, etc., can solve problems such as not meeting concentration limits, and achieve good acid and alkali impact resistance and stability Heavy metals, strong anti-acid and alkali impact effects

Active Publication Date: 2015-03-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when sodium phosphate is used to treat the fly ash of a waste incineration plant (Zhou Bin et al., 2009), when the dosage is 10%, the Pb leaching concentration is 0.46mg / L, which meets the old national standard (GB5086.2-1997) The concentration limit of 3mg / L, but can not meet the new national standard (GB16889-2008), when the dosage is 30% of fly ash, the leaching concentration of Pb is 0.27mg / L, still can not meet the new national standard of 0.25mg / L Concentration limit of L

Method used

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  • Composite heavy metal stabilizing agent containing dithiocarboxylic acid functional star-like super-branched polymer, preparation method and application method thereof
  • Composite heavy metal stabilizing agent containing dithiocarboxylic acid functional star-like super-branched polymer, preparation method and application method thereof
  • Composite heavy metal stabilizing agent containing dithiocarboxylic acid functional star-like super-branched polymer, preparation method and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1: Preparation of trimethylolpropane core dithiocarboxylate functionalized star hyperbranched polymer and sodium hexamethylenediamine tetradithiocarboxylate composite stabilizer

[0051] Add 29.00 g (0.25 mol) of hexamethylenediamine (1,6-Hexanediamine, hereinafter referred to as HDA) and 29.00 g of methanol into a four-necked flask equipped with stirring, reflux condenser and thermometer, and then under 10°C, nitrogen protection and stirring Under the conditions, slowly drop 29.60 g (50.00%, 0.05 mol) methanol solution of trimethylolpropane triacrylate (TMPTA) and control the rate of addition to keep the temperature below 10°C. Then raise the temperature to 25°C and react for 24 hours to obtain a mixture of trimethylolpropane triacrylate / Hexanediamine star hyperbranched polymer (TMPTA / HDA for short) and hexamethylenediamine (HDA) .

[0052] Then cool to 10°C, slowly add 88.40 g (50.00%, 1.105 mol) of sodium hydroxide solution, and control the dropping rat...

Embodiment 2

[0055] Example 2: Preparation of Trimethylolpropane Core Dithiocarboxylate Functionalized Star Hyperbranched Polymer and Sodium Butylenediamine Tetradithiocarboxylate Composite Stabilizer

[0056]Add 22.00 g (0.25 mol) of butanediamine (1,4-Butanediamine, hereinafter referred to as BDA) and 22.00 g of ethanol into a four-necked flask equipped with stirring, reflux condenser and thermometer, and then under the condition of less than 10 ° C, nitrogen protection and stirring conditions Slowly add 29.60 g (50.00%, 0.05 mol) of trimethylolpropane triacrylate (TMPTA) methanol solution dropwise, and control the dropping rate so that the temperature is less than 10°C. Then heat up to 25°C and react for 22 hours to obtain a mixture of trimethylolpropane triacrylate / Butanediamine star hyperbranched polymer (TMPTA / BDA for short) and butanediamine (BDA) .

[0057] Then cool to 10°C, slowly add 95.20 g (50.00%, 1.19 mol) of sodium hydroxide solution, and control the dropping rate so tha...

Embodiment 3

[0060] Embodiment 3: Preparation of trimethylolpropane core dithiocarboxylate functionalized star hyperbranched polymer and sodium ethylenediamine tetradithiocarboxylate composite stabilizer

[0061] Add 18.00 g (0.30 mol) of ethylenediamine (EDA for short) and 18.00 g of methanol into a four-necked flask equipped with stirring, reflux condenser and thermometer, and slowly drop Add 29.60 g (50.00%, 0.05 mol) of trimethylolpropane triacrylate (TMPTA) in methanol, and control the rate of addition so that the temperature is less than 10°C. Then raise the temperature to 25°C and react for 24 hours to obtain a mixture of Trimethylolpropane triacrylate / Ethylenediamine star hyperbranched polymer (TMPTA / EDA for short) and ethylenediamine (EDA) , wherein the molar ratio of TMPTA / EDA to EDA is 1:3.

[0062] Then cool to 10°C, slowly add 126.00 g (50.00%, 1.575 mol) of sodium hydroxide solution, and control the dropping rate so that the temperature of the reaction mixture is less than...

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Abstract

The invention relates to a composite heavy metal stabilizing agent containing dithiocarboxylic acid functional star-like super-branched polymer, a preparation method and an application method thereof. The composite stabilizing agent is composed of dithiocarboxylic salt functional star-like super-branched polymer which takes trimethylol propane as a core and ADA-4CSSNa, wherein a chemical reaction of the dithiocarboxylic salt functional star-like super-branched polymer which takes trimethylol propane as the core is shown as CH3CH2C[CH2OCOCH2CH2N(CSSM)CH2(CH2)nCH2N(CSSM)2]3, a chemical reaction of ADA-4CSSNa is shown as (MSSC)2NCH2(CH2)nCH2N(CSSM)2, and n is a positive integer from 0 to 10; and M is monovalent cation such as Na<+>, K<+> or NH<4+>. The heavy metal stabilizing agent has high efficiency stabilization effect and good acid and alkali performance on heavy metal in the garbage burning fly ash, and can reduce the risk of fly ash in long-term pollution environment; and the composite stabilizing agent is also suitable for processing waste water and soil polluted by heavy metal.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, in particular to the field of solid waste and wastewater treatment containing toxic heavy metals, and specifically relates to a composite heavy metal stabilizer containing dithiocarboxylic acid functionalized star-shaped hyperbranched polymers, a preparation method and the Instructions. Background technique [0002] With the development of urbanization, the output of waste continues to increase, and at the same time, the scale of waste incineration is also increasing year by year. The scale of waste incineration in my country increased from 3.699 million tons in 2003 to 35.84 million tons in 2012, with an average annual increase of 96.9%. Construction Planning of Garbage Harmless Treatment Facilities”, 2012). [0003] However, after garbage incineration, about 2% to 5% of the fly ash contains As, Cd, Cr, Hg, Pb and other toxic heavy metals, which cannot be directly landfilled, a...

Claims

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Application Information

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IPC IPC(8): B09B3/00C02F1/00C02F1/62C08G83/00
Inventor 张冰如李风亭邓天琳
Owner TONGJI UNIV