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Method for preparing carboxymethyl cellulose by waste paper serving as raw material

A technology of carboxymethyl cellulose and cellulose, applied in the field of preparing carboxymethyl cellulose, can solve the problems of low level of waste paper recycling and environmental pollution, achieve high recycling rate, reduce costs, and overcome complex post-processing Effect

Inactive Publication Date: 2018-04-17
ZHEJIANG SCI-TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the recycling level of waste paper in my country is low, and waste paper contains aluminum sulfate, caustic soda and other papermaking auxiliary materials, which will pollute the environment.

Method used

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  • Method for preparing carboxymethyl cellulose by waste paper serving as raw material
  • Method for preparing carboxymethyl cellulose by waste paper serving as raw material
  • Method for preparing carboxymethyl cellulose by waste paper serving as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 6g of dried pulp and place it in a 250ml three-necked flask, add 200mL of 12% concentration NaOH solution into the three-necked flask, and react with mechanical stirring at 100°C for 1h. After the reaction was finished and cooled, the reaction mixture was transferred to a G2 sand core funnel for suction filtration. Subsequently, the sample after suction filtration was transferred to a three-necked flask again, added with distilled water for mechanical stirring, filtered and washed to neutrality, and dried at 80° C. to obtain refined pulp cellulose. The microscopic morphology of the waste paper fiber surface before and after alkali treatment is as follows: Figure 2a and Figure 2b As shown, the X-ray diffraction curve of refined pulp cellulose is as follows Figure 5 As shown in the middle curve a, the thermogravimetric curve is as Figure 6 Shown in curve a.

[0034] In a 250mL three-neck flask equipped with a mechanical stirring device, add 5g of refined was...

Embodiment 2

[0036] Weigh 6g of dried pulp and place it in a 250ml three-necked flask, add 200mL of 12% concentration NaOH solution into the three-necked flask, and react with mechanical stirring at 100°C for 1h. After the reaction was finished and cooled, the reaction mixture was transferred to a G2 sand core funnel for suction filtration. Subsequently, the sample after suction filtration was transferred to a three-necked flask again, added with distilled water for mechanical stirring, filtered and washed to neutrality, and dried at 80° C. to obtain refined pulp cellulose. The microscopic morphology of the waste paper fiber surface before and after alkali treatment is as follows: Figure 2a and Figure 2b As shown, the X-ray diffraction curve of refined pulp cellulose is as follows Figure 5 As shown in the middle curve a, the thermogravimetric curve is as Figure 6 Shown in curve a.

[0037]In a 250mL three-neck flask equipped with a mechanical stirring device, add 5g of refined wast...

Embodiment 3

[0039] Weigh 6g of dried pulp and place it in a 250ml three-necked flask, add 200mL of 12% concentration NaOH solution into the three-necked flask, and react with mechanical stirring at 100°C for 1h. After the reaction was finished and cooled, the reaction mixture was transferred to a G2 sand core funnel for suction filtration. Subsequently, the sample after suction filtration was transferred to a three-necked flask again, added with distilled water for mechanical stirring, filtered and washed to neutrality, and dried at 80° C. to obtain refined pulp cellulose. The microscopic morphology of waste paper fiber surface before and after alkali treatment is shown in Fig. 2, and the X-ray diffraction curve of refined pulp cellulose is shown in Fig. Figure 5 As shown in the middle curve a, the thermogravimetric curve is as Figure 6 Shown in curve a.

[0040] In a 250mL three-neck flask equipped with a mechanical stirring device, add 5g of refined waste paper cellulose and 100mL o...

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Abstract

The invention discloses a method for preparing carboxymethyl cellulose by waste paper serving as a raw material. The method includes the steps: drying waste paper pulp, cutting the dried waste paper pulp into pieces, adding sodium hydroxide solution, reacting mixture at the temperature ranging from 40 DEG C to 100 DEG C, filtering and washing the mixture to reach neutrality, and drying the mixtureto obtain refined cellulose; immerging the refined cellulose into ethanol water containing sodium hydroxide, performing quaternization at the temperature ranging from 25 DEG C to 45 DEG C to obtain alkaline cellulose; continuing to add ethanol water containing chloroacetic acid, heating mixture to reach the temperature ranging from 60 DEG C to 70 DEG C, adding ethanol water containing sodium hydroxide to serve as alkaline catalyst solution, and performing etherification reaction at the temperature ranging from 60 DEG C to 80 DEG C; adjusting pH (potential of hydrogen) to reach neutrality, filtering mixture in an extracting manner, washing and precipitating the mixture by the aid of ethyl alcohol, and drying the mixture to obtain the waste paper carboxymethyl cellulose. According to method, high-additional-value utilization of waste paper resources is achieved, product cost is reduced, environments are protected, and the method is low in cost, simple in operation process, high in product substitution and green and environmentally friendly in process.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for preparing carboxymethyl cellulose by using waste paper as a raw material, which is mainly used as an adhesive, a thickener, etc. in papermaking and daily chemical industries. Background technique [0002] Carboxymethyl cellulose (CMC) is an anionic surfactant, a linear soluble cellulose ether obtained by chemical reaction of natural cellulose widely existing in nature and chloroacetic acid. The appearance of CMC is generally white or light yellow fibrous powder or granular shape, safe and non-toxic, odorless and tasteless, hygroscopic, the solution is neutral or slightly alkaline, insoluble in acid, methanol, ethanol, acetone and ether and other organic solvents , soluble in water and has a certain viscosity. CMC has thickening, water retention, film-forming, gelling, chemical stability, solubility, degradability and suspension effects, etc. These proper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/12
CPCC08B11/12
Inventor 唐艳军黄彪彪王占彬
Owner ZHEJIANG SCI-TECH UNIV
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