Carboxymethyl cellulose prep methods

Carboxymethyl cellulose is a kind of cellulose derivative with ether construction received by chemical substance adjustment of all-natural cellulose, which is traditionally used. In order to enable everyone learn more regarding it, let's understand more about it from the preparation methods.

1. Tools and reagents:

Three-throat flask (250m1), electric stirrer, condenser, decreasing funnel, continuous temperature water bath, warm water funnel, Buchner funnel, suction power filter flask, beaker, Erlenmeyer flask, Kjeldahl flask, water water pump.

Real natural cotton (or paper pulp), 90Per cent ethanol, 79% ethanol, 26Per cent chloroacetic acidity liquor solution, 30Percent NaOH, acetic acidity.

2. Preparing actions of carboxymethyl cellulose:

1. Placed 4g of pulp inside a 3-necked container, add more 100ml of 75% ethanol, and stir. Slowly include 30Per cent NaOH? 40ml through the dropping funnel under strenuous stirring, comfortable water bathtub under reflux (30-35°C) and carry on stirring for 30min. Ethanol can market the penetration and diffusion of alkali to materials. The temperatures from the alkalization process should not go over 35°C to stop the alkali dietary fiber from turning yellow.

2. After the alkali fiber content is cooled to room temperatures, add more 12.5ml of chloroacetic acid solution liquor option through the falling funnel, stir and reflux within a 55°C water bath tub for 45min, then boost the temperature to 70°C, as well as heat and blend under reflux for 1.5h. It is not good in case the reaction temperature is simply too great or too very low. When it is too very low, it will change the conversion price, and when it is too much, it can affect the h2o consumption and viscosity of your completed product or service. Go on a little trial, which can be dissolved in normal water, suggesting the reaction is finished.

3. Filtration while very hot and eliminate the filtrate. Relocate the crude carboxymethyl cellulose merchandise in a beaker, add more 100ml of 95Percent ethanol in a 50°C water bath to generate a slurry, filtration, and clean with a modest amount of 95Per cent ethanol (15ml× 2), until the merchandise fails to have NaCl (check with AgNO3 answer).

4. Distill the product under reduced pressure in a normal water bathroom at 80°C to recover the liquor, and the pure white-colored natural powder carboxymethyl cellulose are usually in the flask.