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Lignin amine macroporous anion exchange resin as well as preparation method and application thereof

A lignin amine and exchange resin technology, applied in ion exchange water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve resin poisoning, unfavorable ion exchange kinetic process, and difficulty in resin regeneration and other problems, to achieve the effect of reducing the preparation cost, improving the ion exchange efficiency and desorption regeneration ability, and improving the utilization rate of raw materials

Active Publication Date: 2022-05-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pores of the product are mostly micropores, or even have no pore structure, which is not conducive to the kinetic process of ion exchange, and is likely to cause resin poisoning and difficult resin regeneration.

Method used

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  • Lignin amine macroporous anion exchange resin as well as preparation method and application thereof
  • Lignin amine macroporous anion exchange resin as well as preparation method and application thereof
  • Lignin amine macroporous anion exchange resin as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Dissolve 10g alkali lignin (raw material from Xiangjiang alkali lignin provided by Hunan Yongzhou Xiangjiang Paper Co., Ltd., the same below) in 20 parts of water, and adjust pH=12 with sodium hydroxide solution; add 4g diethylenetriamine, Under nitrogen protection, the mixture was stirred and dissolved evenly at room temperature, heated to 95°C, and then 5 g of formaldehyde was added dropwise; after the dropwise addition, the reaction was kept at 95°C for 3 hours. Then add 5g epichlorohydrin, use solvent water as the porogen in the curing stage, and cure at 80°C for 12 hours to obtain a blocky ligninamine macroporous anion exchange resin, which can be pulverized to obtain a particle size of 0.5mm ligninamine macroporous anion exchange resin.

[0039] The ligninamine macroporous anion exchange resin prepared in Example 1 is named DAL 1 . DAL in this embodiment 1 The average pore size is 520 nm, the porosity is 54.8%, the lignin content is 46.0%, the dry basis exchang...

Embodiment 2

[0041]Dissolve 10g of alkali lignin in 20 parts of water, adjust pH=12 with sodium hydroxide solution; add 6g of diethylenetriamine, stir and dissolve evenly at room temperature under nitrogen protection, heat up to 95°C, and then dropwise add 7g of formaldehyde ; After the dropwise addition, the reaction was incubated at 95°C for 3 hours. Then add 5g epichlorohydrin, use solvent water as the porogen in the curing stage, and cure at 80°C for 12 hours to obtain a blocky ligninamine macroporous anion exchange resin, which can be pulverized to obtain a particle size of 0.5mm ligninamine macroporous anion exchange resin.

[0042] The ligninamine macroporous anion exchange resin prepared in Example 2 is named DAL 2 . DAL in this embodiment 2 The average pore size of Cr(VI) is 482 nm, the porosity is 50.2%, the lignin content is 52.47%, the dry basis exchange capacity for Cr(VI) reaches 460.7 mg / g, and the 4 2- The dry basis exchange capacity of 201.8 mg / g, for PO 4 3- The dr...

Embodiment 3

[0044] Dissolve 10g of alkali lignin in 20 parts of water, adjust pH=12 with sodium hydroxide solution; add 8g of diethylenetriamine, stir and dissolve evenly at room temperature under nitrogen protection, heat up to 95°C, and then dropwise add 9.3g formaldehyde; after the dropwise addition, the reaction was kept at 95°C for 3 hours. Then add 5g epichlorohydrin, use solvent water as the porogen in the curing stage, and cure at 80°C for 12 hours to obtain a blocky ligninamine macroporous anion exchange resin, which can be pulverized to obtain a particle size of 0.5mm ligninamine macroporous anion exchange resin.

[0045] The ligninamine macroporous anion exchange resin prepared in Example 3 is named DAL 3 . DAL in this embodiment 3 The average pore size is 615 nm, the porosity is 67.5%, the lignin content is 46.15%, the dry basis exchange capacity for Cr(VI) reaches 634.9 mg / g, and the exchange capacity for SO is 634.9 mg / g. 4 2- The dry basis exchange capacity of 186.2 mg...

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Abstract

The invention discloses a lignin amine macroporous anion exchange resin and a preparation method and application thereof, the preparation method comprises the following steps: dissolving lignin in water, and adjusting the pH value of the solution to 10-12; adding amine, stirring and dissolving uniformly at room temperature under the protection of nitrogen, heating to 90-95 DEG C, and dropwise adding aldehyde for reaction; and then adding a cross-linking agent, and carrying out curing reaction by taking water as a pore-foaming agent to obtain the lignin amine macroporous anion exchange resin. According to the method disclosed by the invention, the lignin amine is directly crosslinked by using the cross-linking agent in the aqueous solution, so that on one hand, water can be used as a pore-foaming agent to form the macroporous lignin amine anion exchange resin with a multi-pore structure, and the ion exchange efficiency and the desorption regeneration capacity are greatly improved; on the other hand, unreacted amine in the solution can be further crosslinked, the utilization rate of raw materials is increased, and the content of active groups in the lignin amine macroporous anion exchange resin is increased.

Description

technical field [0001] The present invention relates to modified lignin and its application, in particular to a lignin amine macroporous anion exchange resin and its preparation method and application. Background technique [0002] The lignin structure contains a large number of phenolic hydroxyl groups, which provide a large number of reaction sites for the amination modification of lignin, so it can be used as a natural raw material to prepare anion exchange resins. It can not only reduce the use of fossil energy, but also realize the high-value utilization of lignin. [0003] Ion exchange resin is a network polymer with active groups. It is mainly composed of a resin skeleton and active groups fixed on the skeleton. It has the functions of exchange, catalysis and adsorption. It is widely used in electroplating metallurgy, medicine and health, bioengineering and other fields. [0004] Anion exchange resin can dissociate hydroxide in water and exchange with anions in solu...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08J3/24C08L97/00C02F1/42C02F101/10C02F101/18C02F101/22
CPCC08J9/28C08J3/24C02F1/42C02F2001/422C02F2101/22C02F2101/101C02F2101/105C02F2101/18C08J2201/0504C08J2397/00Y02E60/50
Inventor 周明松吴浩邱学青庞煜霞杨东杰钱勇楼宏铭
Owner SOUTH CHINA UNIV OF TECH
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