Preparation method of high-purity battery-grade ammonium carboxymethyl cellulose

• Main Authors: LI CHAO, QIU LEI, GUAN YINGSHUANG, ZHOU KANGJIAN
• Format: Patent
• Language: Chinese; English
• Published: 21.07.2023
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; DERIVATIVES THEREOF; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; POLYSACCHARIDES; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention relates to the technical field of natural polymer chemical modification, in particular to a preparation method of high-purity battery-grade ammonium carboxymethyl cellulose. The method comprises the following steps: S1, selecting a natural cellulose raw material, and preparing a potassium hydroxide solution; s2, carrying out an alkalization reaction to generate alkali cellulose; s3, carrying out etherification reaction to prepare an etherifying agent, and then carrying out secondary etherification reaction; s4, carrying out acidification reaction; s5, carrying out an ammoniation reaction; and S6, washing, drying, crushing and finally sieving to obtain a high-purity ammonium carboxymethyl cellulose finished product. Through raw material adjustment and process formula design, the preparation method has the advantages of high product yield, few side reactions, high product stability, small product ash content, few raw fiber residues, high light transmittance, good dispersion solubility and uniform