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Method for preparing carboxycellulose by using hydrogen peroxide

A carboxycellulose, hydrogen peroxide technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of limiting the wide application of oxidized cellulose, harsh conditions, and by-products leftover, etc., and achieves convenient industrial application and reaction conditions. Mild, lower production cost effect

Active Publication Date: 2014-09-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, although there have been reports on the preparation of carboxylated oxidized cellulose at home and abroad, the preparation process is complicated and the conditions are harsh, and it must be prepared in a strongly acidic or alkaline medium.
The selected oxidizing agent is not only destructive to the cellulose itself, but also has by-products left over, which has a certain impact on the environment
During the reaction process, the molecular weight of cellulose will be reduced to a certain extent, the oxidation and degradation will be uneven, and the degradation will be too severe and other defects, which limit the wide application of oxidized cellulose.

Method used

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  • Method for preparing carboxycellulose by using hydrogen peroxide
  • Method for preparing carboxycellulose by using hydrogen peroxide
  • Method for preparing carboxycellulose by using hydrogen peroxide

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Take 20 parts by mass of cellulose and soak it in a potassium carbonate solution with a mass fraction of 24%, wash it with distilled water after soaking for 2 hours, and filter it to neutrality, then add 14 parts of hydrogen peroxide and 100 parts of water , and cobalt sulfate accounting for 0.025% of the cellulose mass, stirred with a magnetic stirrer for 24 hours at a temperature of 20°C. After oxidation, it was washed with distilled water until the pH was 7, and the obtained sample was dried in an oven at 55°C for 8 hours to obtain oxidized cellulose with high carboxyl content, which was ground into powder and then dissolved and titrated, and the carboxyl content was measured as 6.3%.

Embodiment 2

[0042] Weigh 20 parts by mass of cellulose and soak it in 18% sodium hydroxide solution, wash with distilled water after soaking for 12 hours, and filter it to neutrality, then add 30 parts of hydrogen peroxide and 100 parts of cellulose Water, and iron sulfate accounting for 0.075% of the mass of cellulose were stirred with a magnetic stirrer for 48 hours at a temperature of 15°C. After oxidation, it was washed with distilled water until the pH was 7, and the obtained sample was dried in an oven at 60°C for 6 hours. After drying, it was ground into powder and then dissolved and titrated. The carboxyl content was found to be 6.7%.

Embodiment 3

[0044] Take 20 parts by mass parts of cellulose and soak it in a potassium hydroxide solution with a mass fraction of 30%, wash it with distilled water after soaking for 8 hours, and filter it to neutrality, then add 28 parts of hydrogen peroxide and 100 parts of Water and cobalt sulfate accounting for 1% of the cellulose mass were stirred with a magnetic stirrer for 75 hours at a temperature of 25°C. After oxidation, the sample was washed with distilled water until the pH was 7, and the obtained sample was dried in an oven at 60°C for 7 hours. After drying, it was ground into powder and then dissolved and titrated. The carboxyl content was found to be 6.6%.

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Abstract

The invention relates to a method for preparing carboxycellulose by using hydrogen peroxide. The method comprises the steps of weighing 20 parts of cellulose in parts by mass, soaking in a pre-treatment solution of which the mass percentage is 5-40%, washing by using distilled water after soaking for 1-48 hours, performing suction filtration to be neutral, adding 10-80 parts of oxidant in parts by mass and a catalyst which accounts for 0.01-5% of the mass of cellulose, stirring for 0.5-96 hours by using a magnetic stirrer, performing solid-liquid separation, washing a solid product by using the distilled water until the pH value is 7.0, and baking an obtained solid sample in a baking oven at 40-80 DEG C for 4-12 hours to obtain oxidized cellulose with different oxidation degrees. The method disclosed by the invention is relatively mild in reaction condition, simple in process and high in yield, does not have special requirements for equipment technologies, is convenient for industrial application, is low in preparation cost, can not generate any harmful by-products, is green and environment-friendly, and can not cause any hazards and pollutions to the environment.

Description

technical field [0001] The invention belongs to the technical field of carboxy cellulose, in particular to a method for preparing carboxy cellulose by using hydrogen peroxide. Background technique [0002] Cellulose is a macromolecular polysaccharide composed of D-glucopyranose with β-1,4-glucosidic bonds, with a molecular weight of about 50,000 to 2,500,000, equivalent to 300 to 15,000 glucosyl groups, and is the most widely distributed and most abundant in nature. Natural polymers, derived from the photosynthesis of plants, are cheap and widely used in various fields. [0003] Oxidized cellulose (Oxidized Cellulose) is a derivative of cellulose, which has the characteristics of good biocompatibility, biodegradability, environmental friendliness and non-toxicity, so it is widely used in various fields. The performance of oxidized cellulose with high carboxyl content is greatly improved compared with natural cellulose after chemical modification. In particular, the carboxy...

Claims

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Application Information

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IPC IPC(8): C08B15/04B01J20/24
Inventor 张水洞姜立春陈艳琴林少娜黄恒
Owner SOUTH CHINA UNIV OF TECH
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