PROCESS FOR PRODUCING NON-CRYSTALLINE CELLULOSE

A process for producing non-crystalline cellulose with excellent productivity, wherein a cellulosic raw material in which the components thereof excluding water have a cellulose content of 20 mass% or higher and the cellulose has a cellulose I crystallinity, shown by the following calculation formula (1), of higher than 33% and which has a water content of 1.8 mass% or lower is treated with a pulverizer to reduce the cellulose I crystallinity thereof to 33% or lower. Cellulose I crystallinity (%) = [(I22.6-I18.5)/I22.6]×100 (1) [I22.6 indicates the X-ray diffraction intensity of the lattice plane (002) (diffraction angle 2? = 22.6º) and I18.5 indicates the X-ray diffraction intensity of the amorphous part (diffraction angle 2? = 18.5º).]