Method for preparing sodium carboxymethyl cellulose

• Main Authors: GUO HONGYAN, LI YOUQI
• Format: Patent
• Language: English
• Published: 06.05.2015
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; DERIVATIVES THEREOF; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; POLYSACCHARIDES; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention relates to a method for preparing sodium carboxymethyl cellulose. The method for preparing high-substituting-degree sodium carboxymethyl cellulose, provided by the invention, has the aims that the source of raw materials is wide, the process is simple and the investment is small. The method comprises the steps: crushing cellulose, then, putting the crushed cellulose, an ethanol solution of sodium hydroxide and flaky sodium hydroxide into a kneader together, vacuumizing, inflating inert gas, and carrying out first-time alkalization reaction at the temperature of 10-50 DEG C; adding an etherifying agent, adding the ethanol solution of sodium hydroxide again, and carrying out second-time alkalization reaction; adding the etherifying agent, and heating up to further react for 30-90 minutes; washing a product, neutralizing, centrifuging, drying and crushing, thereby obtaining the sodium carboxymethyl cellulose finished product. During the production of sodium carboxymethyl cellulose by adopting the method disclosed by the invention, when the product substituting degree is greater than 1.0, the utilization ratio of chloroacetic acid reaches 76% and is increased by 13% compared with the traditional processes; when the product substituting degree is greater than 1.2, the utilization ratio of chloroacetic acid reaches 70% and is increased by 15% compared with the traditional processes.