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Mercapto and carboxyl functionalized pentaerythritol core star hyperbranched polymer, preparation method and use thereof

A technology of hyperbranched polymers and carboxyl functionalization, which is applied in the preparation of organic compounds, mercaptans, and carboxylates. It can solve problems such as poor acid resistance, increased safety risks, and increased leaching of heavy metals. Good anti-acid and alkali impact effect

Active Publication Date: 2018-06-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a long-term natural environment, acid rain will gradually neutralize the alkaline substances in fly ash. At this time, fly ash is in an external environment with pH<5, and the leaching of heavy metals will increase rapidly.
Therefore, the phosphate-stabilized fly ash stabilization product has insufficient acid resistance, increasing its long-term safety risk
[0009] Similarly, inorganic salt stabilizers such as sulfides, alkaline substances, and iron salts also have the problems of large dosage and poor acid resistance.

Method used

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  • Mercapto and carboxyl functionalized pentaerythritol core star hyperbranched polymer, preparation method and use thereof
  • Mercapto and carboxyl functionalized pentaerythritol core star hyperbranched polymer, preparation method and use thereof
  • Mercapto and carboxyl functionalized pentaerythritol core star hyperbranched polymer, preparation method and use thereof

Examples

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Effect test

Embodiment 1

[0037] Embodiment 1: Preparation of mercapto and carboxyl functionalized pentaerythritol core star hyperbranched polymer

[0038] Add 13.60 g (50%, 0.05 mol) of pentaerythritol in acetic acid solution into a four-neck flask with stirring, reflux condenser and thermometer, then add 39.20 g (50%, 0.20 mol) of maleic anhydride in acetic acid solution, and stir well Afterwards, under the protection of nitrogen, the temperature was raised to 85° C. and reacted for 4 hours to obtain pentaerythritol tetramaleate. Then lower the temperature to 30°C, add 31.92 g (50%, 0.21 mol) of thiourea in methanol while stirring, react at 30°C for 18 hours, and distill under reduced pressure at 90°C to obtain a white solid, which is washed twice with water , filtered and vacuum-dried to obtain 40.78 g of a white solid, namely amidinosulfanyl and carboxyl-functionalized pentaerythritol-core star-shaped hyperbranched polymers, with a yield of 98.03%. Put the obtained white solid into 100 g aqueous s...

Embodiment 2

[0041] Embodiment 2: Preparation of mercapto and carboxyl functionalized pentaerythritol core star hyperbranched polymer

[0042] Add 13.60 g (50%, 0.05 mol) of pentaerythritol in acetic acid solution into a four-necked flask with stirring, reflux condenser and thermometer, then add 39.79 g (50%, 0.203 mol) of maleic anhydride in acetic acid solution, and stir well Afterwards, under nitrogen protection, the temperature was raised to 90° C., and the reaction was carried out for 3 hours to obtain pentaerythritol tetramaleate. Then lower the temperature to 30°C, add 33.44 g (50%, 0.22 mol) of thiourea in methanol while stirring, react at 40°C for 16 hours, and distill under reduced pressure at 95°C to obtain a white solid, which is washed twice with water , filtered and dried in vacuo to obtain 41.19 g of white solid, namely amidinosulfanyl and carboxyl-functionalized pentaerythritol-core star-shaped hyperbranched polymer, with a yield of 98.01%. The obtained white solid was put...

Embodiment 3

[0043] Example 3: Stabilization treatment of incineration fly ash

[0044] The incineration fly ash comes from a waste incineration plant. The leaching toxicity test adopts the acetic acid leaching toxicity test specified in the industry standard "Solid Waste Leaching Toxicity Leaching Method - Acetic Acid Buffer Solution Method (HJ / T 300-2007)", and its pollutant control standard It is "Standards for Pollution Control of Domestic Garbage Landfill Sites (GB16889-2008)", and the test results are shown in Table 1. It can be seen that the leaching concentration of Cd and Pb in the fly ash exceeds the national standard for the identification of hazardous waste leaching toxicity, and other heavy metal elements do not exceed the standard. Therefore, it must be stabilized to make the concentration of heavy metals in the leach solution lower than the standard limit before it can be landfilled.

[0045] The mercapto and carboxyl functionalized pentaerythritol core star-shaped hyperbra...

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Abstract

The invention relates to a sulfydryl and carboxyl functional pentaerythritol core starlike hyperbranched polymer, a preparation method and application thereof.The polymer is a starlike hyperbranched polymer with sulfydryl and carboxyl as end groups and pentaerythritol as a core.The chemical formula of the polymer is C[CH2OCOCH2CH(COOH)SH]4.The starlike hyperbranched polymer and heavy metals can form matter with the extremely low solubility, the polymer can be used as a stabilizer for the heavy metals in refuse incineration fly ash, the stabilized fly ash heavy metals have good acid and alkali resistance, and the risk that the fly ash pollutes the environment again in a long-term natural environment can be reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and environmental protection, and in particular relates to a star-shaped hyperbranched polymer with a mercapto- and carboxyl-functionalized pentaerythritol core, a preparation method and its application, and its use for stabilizing heavy metals in incineration fly ash. Background technique [0002] Waste incineration has received more and more attention because of its advantages of volume reduction, volume reduction, high degree of harmlessness, and recyclable energy, and has gradually become one of the mainstream technologies for the harmless treatment of waste in my country. However, the 3%~5% fly ash produced by incineration is rich in toxic heavy metals, and direct landfill will pollute the soil and groundwater, which is prohibited in many countries with strict legislation. For example, China, the United States, Japan, France, Italy, etc. all stipulate that the fly ash must be treate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C319/02C07C323/52A62D3/33A62D101/43A62D101/08
CPCA62D3/33A62D2101/08A62D2101/43C07C67/08C07C319/02C07C335/34C07C323/52C07C69/60
Inventor 郅玉声李风亭张冰如
Owner TONGJI UNIV
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