Cellulosic polymers consist of highly ordered (crystalline regions) as well as amorphous (disordered) regions linked together in cellulose fibrils . The ground pulp (over 80% dry mass is cellulose) is mixed with the preheated sulphuric acid stream leading to the hydrolysis reaction. The concentrated acid breaks down hemicellulose and the amorphous regions of cellulose at a much faster rate than the crystalline cellulose regions. Subsequently, cellulose chains become shorter until the amorphous regions are fully hydrolyzed, leading to liberation of the crystalline domains, namely, the cellulose nanocrystals (CNC) . In this process, the degree of polymerization (DP) is decreased until a levelling-off DP is reached at ~90-100 ,