Method for producing cellulose ester acetate by using plant cellulose

A technology of cellulose acetate and plant cellulose, applied in the field of preparation of cellulose acetate, can solve the problem of high cost of raw materials, and achieve the effects of improving reaction rate, expanding application scope and abundant raw material sources

Inactive Publication Date: 2007-05-09
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method solves the problem of high raw material cost in the current method for producing cellulose ester

Method used

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  • Method for producing cellulose ester acetate by using plant cellulose
  • Method for producing cellulose ester acetate by using plant cellulose
  • Method for producing cellulose ester acetate by using plant cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh about 0.6g of corn cob cellulose and 59.4g of ionic liquid 1-allyl-3-methylimidazolium chloride (AMIMCl), put them into a round bottom flask, heat in an oil bath to 80°C, seal and stir vigorously 2h. A clear and transparent cellulose solution was obtained, and the concentration of the cellulose solution was 1% (mass fraction). At the same time, acetic anhydride (about 1.05 ml) was added to the solution so that the molar ratio of acetic anhydride to cellulose glucose unit was 3:1, and the reaction was carried out for 1 h. After the reaction was completed, the product was repeatedly washed with water, then placed in a vacuum drying oven, and dried at 60°C for 24 hours; at the same time, the water in the washing liquid was removed by rotary evaporation to realize the recovery of the ionic liquid.

[0032] Weigh 0.1 g of the intermediate product, dissolve in 3 ml of dichloromethane-methanol mixed solvent (volume ratio 9:1), dissolve at room temperature for 2 h, and t...

Embodiment 2

[0034] Weigh about 0.6g of corn stalk cellulose and 9.6g of ionic liquid 1-ethyl-3-methylimidazolium acetate (EMIMAc), put them into a round bottom flask, heat to 60°C in an oil bath, seal and stir vigorously for 4h . A clear and transparent cellulose solution was obtained, and the concentration of the cellulose solution was 4% (mass fraction). The temperature of the oil bath was raised to 90°C, and acetic anhydride (about 1.58 ml) was added to the solution at the same time, so that the molar ratio of acetic anhydride to cellulose glucose unit was 4.5:1, and the reaction was carried out for 8 hours.

[0035] Ionic liquid recovery and product separation are the same as in Example 1.

Embodiment 3

[0037] Weigh about 0.6g of peanut shell cellulose and 9.6g of ionic liquid 1-butyl-3-methylimidazolium chloride (BMIMCl), put them into a round bottom flask, heat to 90°C in an oil bath, seal and vigorously stir mechanically for 6h. A clear and transparent cellulose solution was obtained, and the concentration of the cellulose solution was 4% (mass fraction). The temperature of the oil bath was raised to 120° C., and acetic anhydride (about 2.45 ml) was added to the solution at the same time, so that the molar ratio of acetic anhydride to cellulose glucose unit was 7:1, and the reaction was carried out for 12 hours.

[0038] Weigh 0.1 g of the intermediate product, dissolve it in 5 ml of dichloromethane-methanol mixed solvent (volume ratio 9:1), dissolve at room temperature for 4 h, and then filter with suction to obtain a clear and transparent filtrate. Settling and filtering the filtrate in n-hexane, and collecting the filter residue, the filter residue is cellulose acetate....

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Abstract

This invention relates to a method for preparing cellulose ester acetate from plant cellulose in ionic liquid. The method comprises: (1) utilizing plant cellulose as the raw material; (2) dissolving plant cellulose in ionic liquid; (3) adding acylation agent into the ionic liquid, performing homogeneous acetylation on plant cellulose, washing the intermediate with water and drying; (4) separating and purifying dried intermediate to obtain cellulose ester acetate. This invention provides a method for homogeneously preparing cellulose ester acetate in clean solvent (ionic liquid) by using low quality plant cellulose as the raw material. The method solves the problem of high cost faced by the present methods.

Description

technical field [0001] The invention relates to a method for preparing cellulose acetate, in particular to a method for producing cellulose acetate by utilizing plant cellulose in an ionic liquid. Background technique [0002] Cellulose acetate is an organic acid ester with the largest output and widest application among cellulose derivatives, and is widely used in clothing fabrics, cigarette filters, plastics, films and coatings. Acetate fiber is the first man-made fiber invented by human beings. Due to the structure of the fiber itself, its products have many advantages of natural fibers, such as acetate silk has a lighter specific gravity, better hand feeling, and better hygroscopicity than synthetic fibers. It can also be interwoven with synthetic filaments and cotton yarns or after post-treatment to learn from each other to obtain varieties with excellent performance. In this regard, more than 100 kinds of acetate fabric products have been developed abroad in recent ye...

Claims

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Application Information

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IPC IPC(8): C08B3/06
CPCY02P20/54
Inventor 曹妍武进李会泉张懿张军何嘉松
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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