Enhanced hydrolysis of mechanically pretreated cellulose in water/CO2 system

Kejing Wu; Guangrong Feng; Yingying Liu; Changjun Liu; Xingyilong Zhang; Shijie Liu; Bin Liang; Houfang Lu

doi:10.1016/j.biortech.2018.03.098

Enhanced hydrolysis of mechanically pretreated cellulose in water/CO₂ system

Bioresour Technol. 2018 Aug:261:28-35. doi: 10.1016/j.biortech.2018.03.098. Epub 2018 Mar 31.

Authors

Kejing Wu¹, Guangrong Feng¹, Yingying Liu¹, Changjun Liu², Xingyilong Zhang¹, Shijie Liu³, Bin Liang⁴, Houfang Lu⁵

Affiliations

¹ Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, China.
² School of Chemical Engineering, Sichuan University, Chengdu 610065, China.
³ Department of Paper and Bioprocess Engineering, State University of New York College of Environmental Science and Forestry, Syracuse, NY 13210, USA.
⁴ Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, China; School of Chemical Engineering, Sichuan University, Chengdu 610065, China.
⁵ Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, China; School of Chemical Engineering, Sichuan University, Chengdu 610065, China. Electronic address: luhouf@163.com.

PMID: 29653331
DOI: 10.1016/j.biortech.2018.03.098

Abstract

The aim of this work was to study promotion of ball milling and CO₂ assistance on cellulose hydrolysis kinetics in water medium. Kinetic behaviors were analyzed based on first-order and shrinking core models. The results showed that cellulose hydrolysis is enhanced by ball milling and CO₂ assistance. Ball milling reduced crystallinity and particle size of cellulose, resulting in high cellulose conversion, while hydrolysis promoted by CO₂ assistance was weaker. Double-layer hydrolysis was observed for ball-milled cellulose, and rate constant in active layer is higher. Based on double-layer shrinking core model (DL-SCM), activation energy of cellulose conversion decreased from 73.6 to 39.8 kJ/mol when ball milling and CO₂ assistance were applied. Hydrolysis active layer was about 0.9 μm, representing activated thickness of ball-milled cellulose. Hydrolysis promotion by crystallinity and particle size reduction was distinguished via DL-SCM, and crystal evolution possesses greater improvement than particle size decrease on hydrolysis of ball-milled cellulose.

Keywords: Ball milling; CO(2) assistance; Cellulose; Hydrolysis kinetics; Shrinking core model.

MeSH terms

Carbon Dioxide*
Cellulose / chemistry*
Hydrolysis
Particle Size
Water

Substances

Water
Carbon Dioxide
Cellulose