Effect of ball milling on the hydrolysis of microcrystalline cellulose in hot‐compressed water

Abstract

Ball milling leads to a considerable reduction in cellulose particle size and crystallinity, as well as a significant increase in the specific reactivity of cellulose during hydrolysis in hot‐compressed water (HCW). Cryogenic ball milling for 2 min also results in a significant size reduction but only little change in cellulose crystallinity and specific reactivity during hydrolysis. Therefore, crystallinity is the dominant factor in determining the hydrolysis reactivity of cellulose in HCW while particle size only plays a minor role. Ball milling also significantly influences the distribution of glucose oligomers in the primary liquid products of cellulose hydrolysis. It increases the selectivities of glucose oligomers at low conversions. At high conversions, the reduction in chain length plays an important role in glucose oligomer formation as cellulose samples become more crystalline. An extensive ball milling completely converts the crystalline cellulose into amorphous cellulose, substantially enhancing the formation of glucose oligomers with high degrees of polymerization. © 2010 American Institute of Chemical Engineers AIChE J, 2011

Towards carbon efficient biorefining: Multifunctional mesoporous solid acids obtained from biodiesel production wastes for biomass conversion

“…Further, when microcrystalline cellulose was used as substrate sugar yield reduced by half (Fig. 9), which may be attributed to the difficulties associated with getting past the highly packed and crystalline structure of untreated cellulose (crystallinity index ∼82%) [40]. Typically, previous studies have employed amorphous cellulose obtained by ball-milling (48-72 h) as substrate which are much easier to hydrolyze [4,[36][37][38][39][40].…”

Isolation of cellulose nanofibrils from Triodia pungens via different mechanical methods

“…Isolation of micro and nanofibrils from various cellulose sources using ball milling methods has already been reported by employing both dry and wet milling conditions (Ago et al 2004;Liimatainen et al 2011;Yu and Wu 2011;Zhang et al 2010). As mentioned earlier, in order to examine the scalability and to identify an optimal processing window, micronizing was performed under wet conditions by systematically varying the milling time and speed.…”

Relationship between Crystallinity Index and Enzymatic Hydrolysis Performance of Celluloses Separated from Aquatic and Terrestrial Plant Materials

“…Cellulose with a lower CrI is more susceptible to hydrolysis because of its loose structure Hendriks and Zeeman 2009). For example, during hydrolysis in hot-compressed water (HCW), the hydrolysis reactions of amorphous cellulose is considerably faster than for crystalline cellulose (Yu and Wu 2011;Yu and Wu 2010). For enzymatic hydrolysis of microcrystalline cellulose, it has also been reported that the lower cellulose CrI, the higher will be the sugar yield and the faster will be the hydrolysis reaction rate (Fan et al 1981;Peng et al 2013;Wang et al 2006).…”