Composite heavy metal chelating agent containing dithiocarboxylate functionalized ethoxylated pentaerythritol core hyperbranched polymer

A technology of heavy metal chelating agent and hyperbranched polymer, which is applied in the fields of organic chemistry, water pollutants, chemical instruments and methods, etc., can solve the problem that the concentration of heavy metals cannot meet the discharge standards, cannot handle complex heavy metal wastewater, and the linear molecular chain is easy to Curl and other problems, to achieve good flocculation and sedimentation performance, good chemical stability, low cost effect

Active Publication Date: 2020-04-28
SHANDONG XINTAI WATER TREATMENT TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although inorganic precipitants (hydroxides, sulfides) are simple and low in cost, they have their inherent limitations: (1) they need to use a large amount of alkali to adjust the pH value; (2) they are easy to form colloids; (3) the precipitation is fine, A large amount of flocculant needs to be added, and the amount of heavy metal sludge is large; (4) Complex heavy metal wastewater cannot be treated; (5) The concentration of residual heavy metals is far from meeting the current discharge standards
Multi-DTC linear polymer chelating agent, there are multiple DTC groups on the linear molecular chain, after chelating with heavy metals, it can quickly flocculate to form large volume, fast sedimentation, and easy to separate deposits, good flocculation, but its linear molecular chain is easy to curl , the DTC group cannot be fully exposed to generate steric hindrance, and the utilization efficiency is low

Method used

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  • Composite heavy metal chelating agent containing dithiocarboxylate functionalized ethoxylated pentaerythritol core hyperbranched polymer
  • Composite heavy metal chelating agent containing dithiocarboxylate functionalized ethoxylated pentaerythritol core hyperbranched polymer
  • Composite heavy metal chelating agent containing dithiocarboxylate functionalized ethoxylated pentaerythritol core hyperbranched polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of dithiocarboxylate functionalized pentaerythritol core hyperbranched polymer and ethylenediamine-N,N'-bisdithiocarboxylate sodium complex heavy metal chelating agent:

[0037] Under nitrogen protection, add 36.00g (0.60mol) ethylenediamine (EDA for short) and 36.00g methanol respectively in the round bottom flask with stirring, reflux condenser, constant pressure dropping funnel and thermometer, start stirring And control the temperature at 25°C; then mix 52.80g (0.10mol) ethoxylated pentaerythritol tetraacrylate (EPTA) and 52.80g methanol into the dropping funnel, and drop them into the ethylenediamine solution in the round bottom flask in three equal parts In , the interval time of each batch of addition is 6h. After the dropwise addition, react at 25°C for 28 hours to obtain an intermediate——ethoxylated pentaerythritol tetrakis((N-(2-aminoalkylene))-3-aminopropionate) hyperbranched polymer and ethylenediamine mixed methanol solution. Then, cool to 20°...

Embodiment 2

[0041] Preparation of dithiocarboxylate functionalized pentaerythritol core hyperbranched polymer and butanediamine-N,N'-bisdithiocarboxylate sodium complex heavy metal chelating agent:

[0042] Under nitrogen protection, 52.80g (0.60mol) of butanediamine (1,4-Butanediamine, hereinafter referred to as BDA) and 52.80g of ethanol were respectively added to the round bottom with stirring, reflux condenser, constant pressure dropping funnel and thermometer In the flask, start stirring and control the temperature at 25°C; then mix 52.80g (0.10mol) of ethoxylated pentaerythritol tetraacrylate (EPTA) with 52.80g of ethanol, place it in the dropping funnel, and drop it into the round bottom in three equal parts. In the ethylenediamine solution in the flask, the interval between the addition of each batch is 6h. After the dropwise addition, react at 25°C for 28 hours to obtain an intermediate——ethoxylated pentaerythritol tetrakis((N-(4-aminoalkylene))-3-aminopropionate) hyperbranched p...

Embodiment 3

[0046] Preparation of dithiocarboxylate functionalized pentaerythritol core hyperbranched polymer and hexamethylenediamine-N,N'-bisdithiocarboxylate sodium complex heavy metal chelating agent:

[0047] Under the protection of nitrogen, 81.20g (0.70mol) of hexamethylenediamine ((1,6-Hexanediamine, referred to as HDA) and 81.20g of ethanol were respectively added to the round bottom with stirring, reflux condenser, constant pressure dropping funnel and thermometer. In the flask, start stirring and control the temperature at 20°C; then mix 52.80g (0.10mol) of ethoxylated pentaerythritol tetraacrylate (EPTA) with 52.80g of ethanol, place it in the dropping funnel, and drop it into the round bottom flask twice In the middle, first drop one-half, stir for 4h, and then drop the remaining one-half. After the dropwise addition, react at 25°C for 24 hours to obtain the intermediate——ethoxylated pentaerythritol tetrakis((N-(6 -aminoalkylene))-3-aminopropionate) hyperbranched polymer and ...

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Abstract

The invention provides a composite heavy metal chelating agent containing a dithiocarboxylate functionalized ethoxylated pentaerythritol core hyperbranched polymer, and relates to the technical fieldof chemical engineering and environmental protection. The composite heavy metal chelating agent provided by the invention is prepared from a dithiocarboxylate functionalized ethoxylated pentaerythritol core hyperbranched polymer and micromolecular alkylene diamine-N, N'-dithiocarboxylate in a molar ratio of 1:(1.0-10.0), and the two components of different structure types have a synergistic positive effect, cooperate with heavy metals to be alternately combined with the heavy metals to form super-large molecular insoluble chelate precipitates while chelating the heavy metals, and have chelating-self-flocculation dual properties. The composite heavy metal chelating agent provided by the invention can treat heavy metal wastewater, especially low-concentration heavy metal wastewater, in a standard reaching manner, is wide in application range, and does not need to add a coagulant aid; and the preparation method is simple in process, easily available in raw materials, low in cost and easyto industrialize.

Description

technical field [0001] The invention relates to the technical fields of chemical engineering and environmental protection, in particular to a compound heavy metal chelating agent containing a dithiocarboxylate functionalized ethoxylated pentaerythritol core hyperbranched polymer, a preparation method and an application. Background technique [0002] In recent years, heavy metal pollution has become the most important environmental crisis in China, posing a serious threat to the ecosystem and public health. With the continuous upgrading of national environmental protection monitoring, the electroplating and steel industry has begun to implement the special discharge of heavy metals in Table 3 of "Electroplating Pollutant Discharge Standard (GB21900-2008)" and "Steel Industry Water Pollutant Discharge Standard (GB13456-2012)" Limit standard. More stringent heavy metal discharge indicators, such as copper discharge from 0.5mg / L to 0.3mg / L; nickel in the electroplating industry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F1/56C02F1/54C07C333/16C02F101/20
CPCC02F1/62C02F1/54C02F1/56C07C333/16C02F2101/20
Inventor 崔进张冰如李风亭
Owner SHANDONG XINTAI WATER TREATMENT TECH
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