Preparation method of coal-based composite chelating agent

A chelating agent, coal-based technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of high cost, unsatisfactory effect, limited source of matrix, etc., and achieve good mechanical properties, excellent chelating performance, and low price cheap effect

Active Publication Date: 2013-04-10
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the inventors found in the research and development process that the current research on che

Method used

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  • Preparation method of coal-based composite chelating agent
  • Preparation method of coal-based composite chelating agent
  • Preparation method of coal-based composite chelating agent

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0024] Example 1

[0025] Taking 10g of raw coal powder as an example, the method for preparing a coal-based composite chelating agent consists of the following steps:

[0026] (1) Take 10g of coal powder with a particle size of 0.075mm, add 0.6g of γ-aminopropyltriethoxysilane and mix well for 3h. The mass ratio of coal powder to γ-aminopropyltriethoxysilane is 1:0.06 to obtain modified coal powder particles.

[0027] (2) Weigh 10g of the modified coal particles prepared in step (1) and place them in 12 mL of acrylic acid, react at 75°C for 4 hours, wash twice with water, and dry to constant weight in a thermostat at 80°C to obtain aminopropyl Basicized coal particles;

[0028] (3) Dissolve 10g of sodium carbonate in 10g of hydroxylamine hydrochloride, add 10g of aminopropylated coal powder, the mass ratio of aminopropylated coal powder to sodium carbonate and hydroxylamine hydrochloride is 1:1:1, mix well , Keep constant temperature reaction under 90℃ water bath condition for 4 ho...

Example Embodiment

[0029] Example 2

[0030] Taking 10g of raw coal powder as an example, the method for preparing a coal-based composite chelating agent consists of the following steps:

[0031] (1) Take 10g of coal powder with a particle size of 0.075mm, add 0.4g of γ-aminopropyltriethoxysilane and mix well for 3h. The mass ratio of coal powder to γ-aminopropyltriethoxysilane is 1:0.04 to obtain modified coal powder particles.

[0032] (2) Weigh 10 g of the modified coal particles prepared in step (1) and place them in 10 mL of acrylic acid, react at 75°C for 4 hours, wash twice with water, and dry to constant weight in a thermostat at 80°C to obtain aminopropyl Basicized pulverized coal particles;

[0033] (3) Dissolve 6g sodium carbonate in 6g hydroxylamine hydrochloride, add 10g aminopropylated coal powder, the mass ratio of aminopropylated coal powder to sodium carbonate and hydroxylamine hydrochloride is 1:0.6:0.6, mix well , Keep constant temperature reaction under 90℃ water bath condition for...

Example Embodiment

[0034] Example 3

[0035] Taking 10g of raw coal powder as an example, the method for preparing a coal-based composite chelating agent consists of the following steps:

[0036] (1) Take 10g of coal powder with a particle size of 0.075mm, add 0.8g of γ-aminopropyltriethoxysilane and mix well for 3h. The mass ratio of coal powder to γ-aminopropyltriethoxysilane is 1:0.08 to obtain modified coal powder particles.

[0037] (2) Weigh 10 g of the modified coal particles prepared in step (1) and place them in 15 mL of acrylic acid, react at 75°C for 4 hours, wash twice with water, and dry to constant weight in a thermostat at 80°C to obtain aminopropyl Basicized pulverized coal particles;

[0038] (3) Dissolve 16g sodium carbonate in 16g hydroxylamine hydrochloride, add 10g aminopropylated coal powder, the mass ratio of aminopropylated coal powder to sodium carbonate and hydroxylamine hydrochloride is 1:1.6:1.6, mix well , Keep constant temperature reaction under 90℃ water bath condition f...

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Abstract

The invention relates to a preparation method of a coal-based composite chelating agent. The method comprises the steps that powdered coal particles are taken as a substrate; the powdered coal particles are subjected to surface modification by a coupling agent, namely r-aminopropyl triethyl silane; polyacrylic acid is coupled and grafted on the surfaces of the powdered coal particles; amine oximation is conducted on the powdered coal particles; and then the coal-based composite chelating agent having good mechanical properties and high heavy metal ion chelation and adsorption capacity is prepared. Powdered coal is relatively cheap and has better mechanical strength, rich pore structure, large specific surface area and good adsorptive property. According to the preparation method, rich active functional groups such as -OH, -COOH and -CO- contained on a macromolecule skeleton of the powdered coal are utilized, the coal is taken as the substrate, and the coal-based composite chelating agent having good mechanical strength and excellent chelation property can be prepared.

Description

technical field [0001] The invention belongs to the technical field of research on chelating adsorbents, in particular to a preparation method of a coal-based composite chelating agent. Background technique [0002] The chelation precipitation method is to use the polymer heavy metal chelating agent to chelate the heavy metal ions in the water to form a water-insoluble flocculent heavy metal complex precipitation to remove the heavy metal ions in the waste water. It also has unique effects in the treatment of gray heavy metals. The chelation precipitation method has high removal efficiency, wide pH range, and good treatment effect, especially for low-concentration wastewater. The complexes formed are stable in nature and will not precipitate heavy metals under strong acid or strong alkaline conditions. Ions, heavy metal chelates are also very stable in the temperature range of -100°C-300°C. Polymer stability can be maintained for hundreds of years in the natural environmen...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30
Inventor 刘转年
Owner XIAN UNIV OF SCI & TECH
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