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Lignin-Based cyclodextrin ester multi-purpose sorbent preparation method

A lignin-based, cyclodextrin technology, applied in the directions of lignin derivatives, chemical instruments and methods, organic chemistry, etc., to achieve the effects of large adsorption capacity, fast adsorption rate and simple preparation process

Inactive Publication Date: 2008-06-11
NORTHEAST FORESTRY UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there are few reports on the development of lignin-based adsorbent materials for the adsorption and separation of mixed pollutants at home and abroad, and it is urgent to develop

Method used

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  • Lignin-Based cyclodextrin ester multi-purpose sorbent preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Purification of raw materials: Dissolve the raw materials with 1 mol / L NaOH solution, filter to remove insoluble matter in the raw materials, adjust the pH of the solution to 2 with 1 mol / L HCl, filter, fully wash with distilled water until neutral, and vacuum dry at 40°C.

[0017] Add 1 g of purified alkali lignin into a 100 mL three-necked flask, add 10 mL of 20% NaOH (mass fraction) solution, stir evenly, add 10 g of epichlorohydrin at room temperature, raise the temperature to 80 ° C, and react for 3 hours. After the reaction, filter, the product is washed with benzene, and then washed with water until neutral, and vacuum-dried at 40°C. Then add 1 g of the above reaction product to 25 mL of 20% NaOH (mass fraction) solution, stir evenly, then add 1 g of β-cyclodextrin, adjust the temperature to 55 ° C, react for 3 hours, filter, and fully wash with distilled water until neutral , dried under vacuum at 40°C. The ligninyl cyclodextrin ether is obtained.

[0018] The...

Embodiment 2

[0020] Add 1 g of the purified alkali lignin into a 100 mL three-necked flask, add 15 mL of 20% NaOH (mass fraction) solution, stir evenly, at room temperature, add 10 g of 1,2-ethylene glycol diglycidyl ether, and heat up to 70°C, react for 3 hours. After the reaction, filter, wash with water until neutral, and dry under vacuum at 40°C. Then add 1.5 g of the above reaction product to 25 ml of 20% NaOH (mass fraction) solution, stir evenly, add 3 g of β-cyclodextrin, adjust the temperature to 55° C., react for 3 hours, filter, wash until neutral, 40° C. Vacuum dry. The ligninyl cyclodextrin ether is obtained.

Embodiment 3

[0022] Add 1 g of the purified lignosulfonate into a 100 mL three-necked flask, add 10 mL of 20% NaOH (mass fraction) solution, stir evenly, add 10 g of epichlorohydrin at room temperature, heat up to 80 ° C, and react 3 Hour. After the reaction, wash with benzene and water until neutral, filter and dry in vacuum. Then add 1.5 g of the above reaction product to 30 mL of 20% NaOH (mass fraction) solution, stir evenly, add 1 g of methyl β-cyclodextrin, adjust the temperature to 50 ° C, react for 4 hours, filter, wash until neutral, Vacuum dried at 40°C. The ligninyl cyclodextrin ether is obtained.

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Abstract

The invention discloses a preparing method of multi-effect lignin cyclodextrin ether to adsorb heavy metal, phenol, phenylamine and uric acid, which comprises the following steps: adopting lignin as material; dissolving through alkaline; purifying through acid settling; dissolving disposed lignin in certain density of sodium hydroxide; adding certain quantity of crosslinking agent in the alkaline solution with weight rate at 1:5-1:15; polymerizing under 50-90 deg.c for 1-5h; adding polymer into cyclodextrin with weight rate at 1-5:1; filtering; washing; drying; grinding; obtaining the lignin cyclodextrin ether adsorbent. The lignin is alkali lignin and lignin sulfonate. The crosslinking agent is epichlorohydrin, 1, 2-glycol bisglycidyl ether or 1, 2-butanediol bisglycidyl ether. The cyclodextrin is beta-cyclodextrin, methyl beta-cyclodextrin or hydroxypropyl beta-cyclodextrin.

Description

technical field [0001] The invention relates to a preparation method of a multi-effect lignin-based adsorbent capable of simultaneously adsorbing heavy metals, phenol and aniline, and also adsorbing uric acid. Background technique [0002] The reserves of the earth's non-renewable resources are limited, and synthetic polymer materials and other organic chemical products that mainly rely on oil and natural gas as raw materials will face the plight of gradually depleting raw material sources. Renewable resources are the best alternative resources. Lignin is one of the most abundant renewable resources on the earth. Every year, 150 billion tons of plant growth can be produced in the world, of which 3000 million tons of industrial lignin are produced in the waste liquid of the paper industry. tons. As a by-product of the wood hydrolysis industry and the paper industry, lignin has not been effectively utilized and has become one of the main sources of pollution in the paper indu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07G1/00B01J20/22C08H7/00
Inventor 方桂珍胡春平王献玲
Owner NORTHEAST FORESTRY UNIVERSITY
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