Crosslinked lignosulfonic acid based cation exchange resin as well as preparation method and application thereof

A lignosulfonic acid and cation exchange technology, which is applied in the field of cross-linked lignosulfonic acid-based cation exchange resin and its preparation, can solve the problem of high risk of sulfuric acid sulfonation reaction, low actual exchange equivalent of resin, and unsatisfactory exchange equivalent and other problems, to achieve the effect of simple and controllable synthesis process, high sulfonation efficiency and low cost

Active Publication Date: 2019-07-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the application of sulfonated cross-linked polystyrene type cation exchange resin is common, such as #732 type cation exchange resin, the risk of oleum sulfonation reaction is large; and it is first polymerized and then sulfonated, and the sulfonation efficiency is low. The actual exchange equivalent of the resin is much lower than the theoretical exchange equivalent
However, the actual exchange equivalent of the composite polystyrene type cation exchange resin is not ideal enough.

Method used

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  • Crosslinked lignosulfonic acid based cation exchange resin as well as preparation method and application thereof
  • Crosslinked lignosulfonic acid based cation exchange resin as well as preparation method and application thereof
  • Crosslinked lignosulfonic acid based cation exchange resin as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Dissolve 5 parts by mass of sodium sulfite, 8 parts by mass of sodium lignosulfonate and 6 parts by mass of acetone in 30 parts by mass of water, then raise the temperature to 40°C for 10 minutes, and then add 5 parts of formaldehyde dropwise within 0.5 hours; , heat up to 85°C for 1 hour and react for 1 hour to obtain a liquid active polycondensation product; put the liquid product in a closed container, add 2 parts by mass of epichlorohydrin and mix evenly, and then react at 90°C for 12 hours to obtain a cross-linked solid Resin, the product can be crushed to obtain 2mm cation exchange resin particles.

[0044] The sulfonic acid group content of the exchange resin product obtained in this embodiment is 2.501 mmol / g.

Embodiment 2

[0046] Dissolve 5 parts by mass of potassium sulfite, 10 parts by mass of ammonium lignosulfonate and 8 parts by mass of acetone in 40 parts by mass of water, then raise the temperature to 50°C for 15 minutes, and then add 12 parts by mass of formaldehyde dropwise within 0.5 hours; After the addition is completed, heat up to 90°C for 1 hour and react for 1 hour to obtain a liquid active polycondensate; put the liquid product in an airtight container, add 3 parts by mass of epichlorohydrin and mix evenly, then keep the temperature at 95°C for 24 hours to obtain a polycondensate Linked solid resin, the product can be crushed to obtain 3mm cation exchange resin particles.

[0047] The sulfonic acid group content of the exchange resin product obtained in this embodiment is 2.625 mmol / g.

Embodiment 3

[0049] Dissolve 5 parts by mass of sodium bisulfite, 15 parts by mass of potassium lignosulfonate and 10 parts by mass of acetone in 50 parts by mass of water, then raise the temperature to 60°C for 20 minutes, and add 10 parts by mass of formaldehyde dropwise within 0.5 hours; After the dropwise addition, the temperature was raised to 95°C for 1 hour of heat preservation reaction to obtain a liquid active polycondensation product; the liquid product was placed in an airtight container, and 4 parts by mass of epichlorohydrin was added to mix evenly, and then kept at 100°C for 24 hours to obtain Cross-linked solid resin, the product can be crushed to obtain 1mm cation exchange resin particles.

[0050] The sulfonic acid group content of the exchange resin product obtained in this embodiment is 2.891 mmol / g.

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Abstract

The invention belongs to the technical field of cation exchange resin and discloses a crosslinked lignosulfonic acid based cation exchange resin as well as a preparation method and application thereof. The method comprises the steps: carrying out an aldol condensation reaction on sulfite, ketone, lignosulfonate and aldehyde to obtain an active polycondensate; and adding a crosslinking agent for athermal insulation curing crosslinking reaction to obtain the crosslinked lignosulfonic acid based cation exchange resin, wherein the dosages of all the components are calculated in parts by mass: 3-8parts of sulfite, 4-10 parts of ketone, 5-15 parts of lignosulfonate, 5-15 parts of aldehyde and 2-5 parts of crosslinking agent. According to the resin disclosed by the invention, not only is the ketone sulfonated to introduce a great number of sulfonic acid groups, but also lignosulfonate also contains a great number of sulfonic acid groups, and therefore, the product is high in sulfonated group content, can be used as a biomass-based strongly-acidic cation exchange resin, has the characteristics of high exchange equivalent weight and relatively low cost, can be used in the field of industrial water treatment and can be particularly applied as a strongly-acidic cation exchange resin to the removal of calcium and magnesium ions in hard water.

Description

technical field [0001] The invention belongs to the technical field of cation exchange resins, in particular to a cross-linked lignosulfonic acid-based cation exchange resin and its preparation method and application. Background technique [0002] Ion exchange resin, as a cross-linked polymer loaded with active groups, has the functions of exchange, absorption and catalysis, and is mainly used in the fields of water treatment, food, electric power, medicine and health, and metallurgy. In my country, strong-acid cation exchange resins are widely used, accounting for 80% of the total output of ion exchange resins. Most of the current commercial cation exchange resins use styrene and acrylic acid (ester) as raw materials, cross-linking and polymerizing with the cross-linking agent divinylbenzene to prepare body-shaped polymers with a network skeleton structure, and then sulfonated with oleum Preparation of sulfonated polystyrene cation exchange resin. Sulfonated polystyrene c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G6/02B01J39/19C02F1/42C02F101/10
CPCB01J39/19C02F1/42C02F2001/425C02F2101/10C08G6/02
Inventor 周明松彭瑞芬邱学青杨东杰汪东平
Owner SOUTH CHINA UNIV OF TECH
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