METHOD OF CONTINUOUSLY PRODUCING DEPOLYMERIZED CELLULOSE ETHER

METHOD OF CONTINUOUSLY PRODUCING DEPOLYMERIZED CELLULOSE ETHER

Provided is a method of continuously producing a depolymerized cellulose ether that is space-saving and highly productive, and is capable of reducing adhesion of a cellulose ether powder body to reactors and producing a depolymerized cellulose ether with a suppressed degree of yellowness and contami...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: KUROTANI, Shinichi, KITAMURA, Akira, MIKI, Kentaro, NARITA, Mitsuo
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
DERIVATIVES THEREOF
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
POLYSACCHARIDES
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:Provided is a method of continuously producing a depolymerized cellulose ether that is space-saving and highly productive, and is capable of reducing adhesion of a cellulose ether powder body to reactors and producing a depolymerized cellulose ether with a suppressed degree of yellowness and contaminants. The method includes: bringing a raw material cellulose ether that is of a temperature of 3°C to less than 40°C and is continuously supplied from a raw material tank 1 to a moisture conditioning tank 2 into contact with a water vapor B to obtain a moisture-conditioned cellulose ether; heating the moisture-conditioned cellulose ether to obtain a heated cellulose ether; continuously bringing a gaseous hydrogen chloride into contact with the heated cellulose ether to obtain a depolymerized cellulose ether product; and mixing the depolymerized cellulose ether product with a basic compound to obtain a depolymerized cellulose ether.