Patent ID: 11498980

Abstract:
Provided is a novel defibration method different from defibration by physical/mechanical pulverization and different from defibration by chemical modification. Provided is a defibration method and a production apparatus each capable of obtaining an intended, fine CNF without chemically modifying the CNF itself and by a treatment for a short time. A method for producing a cellulose nanofiber, the method being a method for continuously obtaining a cellulose nanofiber from raw material cellulose without performing chemical defibration and without performing physical/mechanical defibration in a post-treatment, and comprising mixing subcritical water in a high-temperature/high-pressure state, the subcritical water having a temperature of 180° C. or higher and lower than 370° C. and having a pressure of 5 MPa to 35 MPa, and the raw material cellulose, thereby defibrating the raw material cellulose to obtain a cellulose nanofiber dispersed in water, and a production apparatus for obtaining the cellulose nanofiber.