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Salt-reducing adsorbent used for papermaking production and preparation method and application thereof

An adsorbent and salt reduction technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of low sulfonation degree and insignificant adsorption effect of direct sulfonated modified cellulose. Achieve the effect of making good use of space, reducing paper breaks, and reducing the content of metal ions

Inactive Publication Date: 2019-12-20
广东二十四克垃环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] By chemically modifying cellulose, active groups such as sulfonic acid groups are introduced to adsorb metal ions, but the degree of sulfonation of cellulose modified by direct sulfonation is often low, and it can still play a role in environments with low salt content. , but the adsorption effect is not obvious in the environment with high salinity, so the popularization and use of sulfonated modified cellulose has certain limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Mix 5.00g of cellulose and 65.00g of N,N-dimethylformamide, stir continuously until the mixture is complete, then slowly add 8.00g of chlorosulfonic acid dropwise, control the reaction temperature at 60°C, and the reaction time is 2.0h, Then cool to room temperature, adjust to neutral, and filter under reduced pressure to obtain sulfonated cellulose A1.

[0034] (2) Mix 25.00g of dicyandiamide, 10.00g of acrylamide and 25.00g of hydrochloric acid (15wt%), stir continuously until the mixture is complete, then add 30.00g of formaldehyde, and then add the remaining 30.00g of formaldehyde after the temperature of the reaction system is stable. Formaldehyde was added, the temperature was raised to 80°C, the reaction time was 4.0 hours, and then cooled to room temperature, the obtained liquid was the grafted polymer B1.

[0035] (3) The sulfonated cellulose A1 prepared above, the grafted macromolecule B1 prepared above, and 0.03 g of ammonium persulfate are controlled und...

Embodiment 2

[0037] (1) Mix 4.00g cellulose and 35.00g dichloromethane, stir continuously until the mixture is complete, then slowly add 6.00g oleum dropwise, control the reaction temperature at 60°C, and the reaction time is 4.0h, then cool to room temperature, After adjusting to neutral, filter under reduced pressure to obtain sulfonated cellulose A2.

[0038] (2) Mix 15.00g of dicyandiamide, 7.00g of acrylamide and 15.00g of hydrochloric acid (25wt%), keep stirring until the mixture is complete, then add 23.00g of formaldehyde, after the temperature of the reaction system is stabilized, the remaining 23.00g A mass of formaldehyde was added, the temperature was raised to 80°C, the reaction time was 4.0 hours, and then cooled to room temperature, the obtained liquid was the grafted polymer B2.

[0039] (3) The sulfonated cellulose A2 prepared above, the grafted macromolecule B2 prepared above, and 0.02 g of sodium persulfate are controlled under the condition of nitrogen gas, and the reac...

Embodiment 3

[0041] (1) Mix 2.50g cellulose and 20.00g dichloromethane, stir continuously until the mixture is complete, then slowly add 5.00g chlorosulfonic acid dropwise, control the reaction temperature at 40°C, the reaction time is 4.0h, and then cool to room temperature, After adjusting to neutral, vacuum filtration under reduced pressure to obtain sulfonated cellulose A3.

[0042] (2) Mix 10.00g of dicyandiamide, 5.00g of acrylamide and 10.00g of hydrochloric acid (37wt%), keep stirring until the mixture is complete, then add 15.00g of formaldehyde, after the temperature of the reaction system is stabilized, the remaining 15.00g A mass of formaldehyde was added, the temperature was raised to 60°C, the reaction time was 4.0 hours, and then cooled to room temperature, the obtained liquid was the grafted polymer B3.

[0043] (3) With the sulfonated cellulose A3 prepared above, the grafted macromolecule B3 prepared above and 0.01 g of initiator sodium persulfate, under the condition of n...

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Abstract

The invention belongs to the field of papermaking technology and functional materials, and discloses a preparation and application of a salt-reducing adsorbent used for papermaking production. The preparation method of the salt-reducing adsorbent comprises the following steps: sulfonating cellulose and sulfonating reagent to generate sulfonated cellulose A; reacting dicyandiamide, acrylamide, hydrochloric acid and formaldehyde to obtain graft polymer B; mixing sulfonated cellulose A, grafted polymer B and initiator and reacting to obtain salt-reducing adsorbent. According to the invention, active groups such as sulfonic acid group, amino group and the like are introduced into cellulose through two graft modifications, and atoms such as N, S, O and the like in these groups can provide lonepair electrons in the adsorption process and further form complexes with metal ions, so that metal ions in the solution are adsorbed. At the same time, cellulose is also rich in hydroxyl groups, and lone pair electrons on each group can cooperate to adsorb free metal ions more stably. In addition, the branched chain can make better use of space and better wrap and adsorb metal ions.

Description

technical field [0001] The invention belongs to the field of papermaking technology and functional materials, in particular to a salt-reducing adsorbent used in papermaking production and its preparation method and application. Background technique [0002] In papermaking production, due to the small amount of metal elements contained in the raw materials, the metal ions in the system will gradually accumulate with continuous production. When the metal ion content is too high, it is easy to cause paper breaks, which will affect the paper production and quality of the factory. All have adverse effects, so a method that can reduce the metal ion content of the system is needed. [0003] At the same time, as environmental protection is getting more and more attention today, the paper industry is one of the main sources of wastewater, and it is the general trend to gradually reduce or zero discharge papermaking wastewater. In this regard, if you want to recycle papermaking wastew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F103/28
CPCB01J20/24C02F1/286C02F2103/28
Inventor 张创平
Owner 广东二十四克垃环保科技有限公司
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