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Method for preparing carboxymethyl cellulose by cotton dropped on the ground

A technology of carboxymethyl cellulose and ground cotton, which is applied in the field of polymer chemistry, can solve problems such as harming health, polluting the environment, waste of ground cotton resources, etc., and achieves the goal of reducing production costs, reducing environmental pollution, and reducing environmental pollution Effect

Inactive Publication Date: 2010-07-07
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The waste of a large amount of ground cotton has caused a great waste of resources, endangering people's health and polluting the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The packed 200g ground cotton is opened and decomposed into fluff, and sent to the beater to break the floc raw material into fiber bundles, add 0.5% EDTA and 1.5% magnesium sulfate by mass fraction, and use high-speed The rotating knife stick washes out some heavy impurities; pumps them into the medium-concentrated slag remover to further remove sand, rocks, cotton shells, cotton epidermal cornea and other impurities; mix the crude cotton with a mass fraction of 2% calcium hydroxide The aqueous solution and the aqueous solution with a mass fraction of 0.5% potassium hydroxide pass through the material mixer at the same time, and are sent to a photoelectric oxygen comprehensive reactor (utility model patent number: 200620138146.3) at a temperature of 80°C, and hydrogen peroxide with a mass fraction of 4% is added Be 3% potassium permanganate with the mass fraction, be 18% of the crude cotton mass fraction, react 30min and make it become the cellulose semi-finished produc...

Embodiment 2

[0038] The packed 200g ground cotton is opened and decomposed into velvet, and sent to the Dutch beater to break the floc ground cotton raw material into fiber bundles, adding 0.5% EGTA and 2% magnesia by mass fraction, Use a high-speed rotating knife to wash out some heavy impurities; pump them into a medium-concentrated slag remover to further remove impurities such as sand, stones, cotton shells, and cotton epidermal cornea; mix crude cotton with a mass fraction of 2.5% hydrogen The calcium oxide aqueous solution and the aqueous solution with a mass fraction of 0.5% potassium hydroxide pass through the material mixer at the same time, and are sent to the photoelectric oxygen comprehensive reactor at a temperature of 80 ° C, and the hydrogen peroxide with a mass fraction of 6.5% and the mass fraction of 3.5% are added. Potassium permanganate, crude cotton mass fraction is 20%, reacts 35min and makes it become the cellulose semi-finished product that whiteness is 75%ISO; The p...

Embodiment 3

[0042]The packed 200g ground cotton is opened and decomposed into velvet shape, sent to the Dutch type beater to break the floc ground cotton raw material into fiber bundles, adding 0.5% EDTA and 2% magnesium sulfate by mass fraction, Use a high-speed rotating knife to wash out some heavy impurities; pump them into a medium-concentrated slag remover to further remove impurities such as sand, stones, cotton shells, and cotton epidermal cornea; mix crude cotton with a mass fraction of 2.5% hydrogen The aqueous calcium oxide solution and the aqueous solution with a mass fraction of 0.5% potassium hydroxide pass through the material mixer at the same time, and are sent to the photoelectric oxygen comprehensive reactor at a temperature of 80 ° C. Add hydrogen peroxide with a mass fraction of 5% and a mass fraction of 3.5% Potassium permanganate, the crude cotton mass fraction is 22%, and it is 64%ISO cellulose semi-finished product that reacts 35min to make it become whiteness; The ...

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PUM

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Abstract

The invention relates to a preparation method of carboxymethyl cellulose, in particular to a method for preparing carboxymethyl cellulose by cotton dropped on the ground, which belongs to the technical field of polymer chemistry. The preparation method comprises: taking waste cotton dropped on the ground during spinning as a raw material and refining the cotton dropped on the ground; and obtaining a product of the invention by performing carboxymethylation to cellulose through processes of activation to the cellulose as well as etherification reaction, neutralization reaction and washing to the activated cellulose. The invention can broaden raw materials of the carboxymethyl cellulose and reduce the production cost and production risks brought by shortage of raw materials; and the cotton dropped on the ground produces no poisonous and harmful substances during purification, and has no emission of waste water, waste residue and waste gas, thereby reducing the environmental pollution.

Description

technical field [0001] The invention relates to a method for preparing carboxymethyl cellulose, in particular to a method for preparing carboxymethyl cellulose from botanical cotton, belonging to the technical field of polymer chemistry. Background technique [0002] Carboxymethyl cellulose is a typical and representative cellulose ether, and it is also the most used cellulose ether at present. Because of its good water solubility and properties of thickening, dispersing, film-forming, bonding and protective colloid, it is widely used in oil drilling, textile, printing and dyeing, paint, building materials, papermaking, food, sewage treatment, daily chemical, medicine and other fields. [0003] The production of carboxymethyl cellulose mostly uses refined cotton as raw material. Refined cotton is a refined cotton linter with α-cellulose as the main component, which is obtained by a series of treatments such as high-temperature (160-180°C) alkali boiling and hypochlorous aci...

Claims

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Application Information

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IPC IPC(8): C08B11/12
Inventor 邵自强王普旭王飞俊李跃怡吕少一张云华
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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