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Preparation method for anionic dicarboxy cellulose green flocculation material

An anionic and cellulose technology, applied in the field of environmental engineering, can solve the problems of raw material dependence on petroleum resources, difficulty in biodegradation, and low flocculation efficiency, and achieve the effects of increasing aldehyde content, enhancing electronegativity, and requiring less production equipment

Inactive Publication Date: 2015-12-02
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the practical problems of traditional flocculants such as low flocculation efficiency, difficulty in biodegradation, and dependence on petroleum resources as raw materials, and at the same time resource utilization of renewable biomass resources, to prepare a safe, efficient, and low-cost modified natural polymer flocculant, the present invention The purpose is to provide a preparation method of anionic dicarboxy cellulose green flocculation material

Method used

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  • Preparation method for anionic dicarboxy cellulose green flocculation material
  • Preparation method for anionic dicarboxy cellulose green flocculation material
  • Preparation method for anionic dicarboxy cellulose green flocculation material

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 1) Add 1g of reed pulp to the mixed solution of potassium hydroxide and urea that has been pre-cooled at 2°C for 20 minutes. The mass fractions of potassium hydroxide and urea are 5wt% and 10wt% respectively. The mass ratio of the pulp is 25:1, stirred for 4 minutes to disperse evenly, frozen at -10°C for 120 minutes, taken out and stirred in an ice bath to obtain a uniform and transparent cellulose solution;

[0026] 2) Heat the cellulose solution obtained in step 1) to 50°C under stirring, add anionization reagent sodium chloroacetate to react for 180 minutes, the mass ratio of sodium chloroacetate to reed pulp is 5:1, and obtain uniform, transparent, water-soluble Good anionic cellulose solution;

[0027] 3) Precipitating the anionic cellulose solution obtained in step 2) with ethanol, centrifuging, washing the solid until neutral, and obtaining anionic cellulose;

[0028] 4) Add the anionic cellulose obtained in step 3) to 50 mL of distilled water, add the oxidant ...

Embodiment 2

[0032] 1) Add 1g of moso bamboo dissolving pulp to the mixed solution of potassium hydroxide and urea which has been pre-cooled at 2°C for 20 minutes. The mass fractions of potassium hydroxide and urea are 5wt% and 10wt% respectively. The mass ratio of the moso bamboo dissolving pulp is 35:1, stir for 4 minutes to disperse evenly, freeze at -10°C for 130 minutes, take it out and stir in an ice bath to obtain a uniform and transparent cellulose solution;

[0033] 2) Heat the cellulose solution obtained in step 1) to 45°C under stirring, add anionization reagent sodium chloroacetate to react for 240 minutes, the mass ratio of sodium chloroacetate to moso bamboo dissolving pulp is 3:1, and a uniform, transparent, water-soluble Good anionic cellulose solution;

[0034] 3) Precipitating the anionic cellulose solution obtained in step 2) with ethanol, centrifuging, washing the solid until neutral, and obtaining anionic cellulose;

[0035] 4) Add the anionic cellulose obtained in st...

Embodiment 3

[0039]1) Add 1g of bagasse pulp to the mixed solution of potassium hydroxide and urea which has been pre-cooled at 2°C for 20 minutes. The mass fractions of potassium hydroxide and urea are 5wt% and 10wt% respectively. The mass ratio of the pulp is 45:1, stirred for 4 minutes to disperse evenly, frozen at -10°C for 140 minutes, taken out and stirred in an ice bath to obtain a uniform and transparent cellulose solution;

[0040] 2) Heat the cellulose solution obtained in step 1) to 55°C under stirring, add anionization reagent sodium chloroacetate to react for 420 minutes, the mass ratio of sodium chloroacetate to bagasse pulp is 8:1, and obtain uniform, transparent, water-soluble Good anionic cellulose solution;

[0041] 3) Precipitating the anionic cellulose solution obtained in step 2) with ethanol, centrifuging, washing the solid until neutral, and obtaining anionic cellulose;

[0042] 4) Add the anionic cellulose obtained in step 3) into 60mL of distilled water, add the o...

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Abstract

The invention discloses a preparation method for anionic dicarboxy cellulose green flocculation material. The method is characterized by comprising the following steps: dissolving cellulose through a sodium hydroxide and urea system, adding an anionic reagent, and generating anionic cellulose; and then preparing the anionic dicarboxy cellulose green flocculation material after two stages of oxidation. The method is simple in operation, the raw materials are easy to obtain, the production cost is low, and the method is easy for popularization and application. According to the material disclosed by the invention, chemically modified cellulose is used as a flocculation material, so that the utilization rate of cellulosic feedstocks is sufficiently improved; no poison or byproduct is generated, so that the flocculation efficiency of the existing flocculation cellulose-based material can be significantly improved, and the environmental pollution is reduced; and meanwhile, raw material dependence of traditional synthetic polymer flocculants on petroleum resources is greatly reduced, and the generated anionic dicarboxy cellulose green flocculation material is completely biodegradable and does not cause secondary pollution. The prepared anionic dicarboxy cellulose green flocculation material is widely applied in the flocculation process of papermaking waste water, dyeing waste water, chemical waste water and municipal sewage, and thus has significant environmental and social benefits.

Description

technical field [0001] The invention relates to a preparation method of a cellulose green flocculation material, in particular to a preparation method of an anionic dicarboxy cellulose green flocculation material, and belongs to the technical field of environmental engineering. Background technique [0002] At present, with the rapid development of my country's industry, the output of papermaking, textile, chemical and other industries has increased rapidly, and the discharge of industrial wastewater has also continued to increase. At present, my country's industrial wastewater pollution is relatively serious. More than 90% of the rivers flowing through more than 40 large and medium-sized cities across the country are polluted by industrial wastewater, which has caused great harm to the environment and the health of residents. It has become an urgent problem in my country's environmental protection work. important question. Flocculation and sedimentation are the simplest, mo...

Claims

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Application Information

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IPC IPC(8): C08B15/04C02F1/56
Inventor 张勇陈可忻姚菊明高张昀俞钱涵
Owner ZHEJIANG SCI-TECH UNIV
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