Method for preparing sodium carboxymethylcellulose by abandoned cotton fabrics

A technology of carboxymethyl cellulose and cotton fabrics, applied in the field of preparing sodium carboxymethyl cellulose, which can solve the problems of cumbersome process steps, complicated pre-treatment, long cooking time, etc., achieve green environmental protection in the process, and overcome cumbersome post-processing , high yield and high purity

Inactive Publication Date: 2012-08-22
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

1) The patent application (publication number: CN88101790A) records that rice straw and plant stalks are used as raw materials, and sodium carboxymethyl cellulose is prepared through nearly 15 steps such as stockpiling, pretreatment, and impregnation; since vegetation also contains lignin , pentose, fat and wax and other organic matter, in order to remove these organic matter, the cooking temperature required by the method is higher, and the cooking time is longer, time-consuming and labor-intensive; Broken paper is used as raw material, and sodium carboxymethyl cellulose is prepared through nearly 13 steps such as pretreatment, alkalization, and pressure filtration; since the cellulose content in the coated broken paper used as raw material is not high, the purity of the obtained product is not high. High, at the same time, the cost of coating broken paper is relatively high, and the process steps of this method are relatively cumbersome, so the preparation cost of this method is relatively high
3) In the patent application (publication number: CN101768220A), the ground cotton is used as a raw material, and sodium carboxymethyl cellulose is prepared through steps such as removal of impurities, alkalization, etherification; because there are more impurities in the ground cotton as a raw material, For example, sand, stone, cotton shell, and cotton epidermal cornea, the pre-treatment is quite complicated; at the same time, there are many types of organic solvents that need to be used in the preparation process, which makes the post-treatment of the preparation process more cumbersome
At present, the industrial production of sodium carboxymethyl cellulose mostly uses refined cotton linters as raw materials, but the price of cotton linters is high, and a large amount of difficult-to-treat wastewater is generated during the refining process, polluting the environment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Raw material pretreatment

[0043]Wash, dry and shred the waste cotton tops, place them in a hydrogen peroxide solution with a mass concentration of 30%, heat and stir them with an electronic thermostat electric heating mantle, and the heating temperature is 76°C. Squeeze out the pretreatment agent solution in the cotton fabric after the fabric fades.

[0044] (2) Alkaline cooking

[0045] Put the cotton fabric in a sodium hydroxide solution with a mass concentration of 20%, and use a KDM type temperature-adjusting electric heating mantle to cook at 75°C for 90 minutes and stir until the color of the cotton fabric fades completely, then filter and dry to obtain cellulose.

[0046] (3) Alkalization of cellulose

[0047] Weigh 1g of cellulose, cut it into pieces and put it into a glass container, add 30ml of sodium hydroxide solution with a mass fraction of 45% to completely immerse the cellulose, and then stir for 2h at 30°C using a multi-head magnetic stirrer, Re...

Embodiment 2

[0054] (1) Pretreatment of raw materials:

[0055] After washing, drying and cutting the waste cotton tops into thin strips, weigh 3g, completely immerse it in a hydrogen peroxide solution with a mass concentration of 45%, heat and stir with an electronic temperature-regulating electric heating mantle, The heating temperature is 100°C. Observe with the naked eye, and squeeze out the hydrogen peroxide solution in the cotton fabric after it fades.

[0056] (2) Alkaline cooking

[0057] Add the cotton fabric to the sodium hydroxide solution with a mass concentration of 10%, and use a KDM type temperature-adjusting electric heating mantle to cook at 100°C for 45 minutes, stir properly to prevent swelling, until the color of the cotton fabric fades completely, filter and dry to obtain cellulose.

[0058] (3) Alkalization of cellulose

[0059] Cut the cellulose into pieces and put it into a glass container, add 30ml of sodium hydroxide solution with a mass concentration of 40% to...

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Abstract

The invention discloses a method for preparing sodium carboxymethylcellulose by abandoned cotton fabrics, which includes cleaning, drying and cutting up the abandoned cotton fabrics, placing the abandoned cotton fabrics into a pretreating agent solution for heating and stirring, and filtering out after the abandoned cotton fabrics faded; placing and heating the abandoned cotton fabrics in a sodium hydroxide solution for 45-90 minutes at the temperature from 75 DEG C to 100DEG C until colors of the abandoned cotton fabrics are completely faded, and obtaining celluloses; submerging the celluloses into the sodium hydroxide solution, heating the celluloses for 1.5-2 hours at the temperature from 30 DEG C to 50 DEG C, and then removing the sodium hydroxide solution to obtain alkali celluloses; shredding the alkali celluloses and adding absolute ethyl alcohol and the sodium hydroxide solution; dropwise adding a chloroacetic acid ethanol solution at the temperature from 50 DEG C to 60 DEG C; heating for 80-100 minutes at the temperature from 70 DEG C to 80 DEG C; performing a suction filtration and washing; and adding a phenolphthalein indicator, dropwise adding hydrochloric acid for a neutralization until the solution is colorless, washing 1-2 times, and drying after a suction filtration to obtain a finished product.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for preparing sodium carboxymethyl cellulose by using waste cotton fabrics. Background technique [0002] At present, there are many preparation methods of sodium carboxymethyl cellulose, and each method has its own advantages and disadvantages. 1) The patent application (publication number: CN88101790A) records that rice straw and plant stalks are used as raw materials, and sodium carboxymethyl cellulose is prepared through nearly 15 steps such as storage, pretreatment, and impregnation; since the vegetation also contains lignin , pentose, fat and wax and other organic matter, in order to remove these organic matter, the cooking temperature required by the method is higher, and the cooking time is longer, time-consuming and labor-intensive; Broken paper is used as raw material, and sodium carboxymethyl cellulose is prepared through nearly 13 steps such as p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/12C08B11/20
Inventor 杨莉朱杨志李斌郭佳韩赛男肖梦娜
Owner CHANGAN UNIV
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