Assessment on temperature-pressure severally controlled explosion pretreatment of poplar

Huimei Wang; Zhong Liu; Xu Zheng; Xuejun Pan; Lanfeng Hui; Jingzhi Li; Hao Zhang

doi:10.1016/j.carbpol.2019.115622

Assessment on temperature-pressure severally controlled explosion pretreatment of poplar

Carbohydr Polym. 2020 Feb 15:230:115622. doi: 10.1016/j.carbpol.2019.115622. Epub 2019 Nov 13.

Authors

Huimei Wang¹, Zhong Liu², Xu Zheng¹, Xuejun Pan³, Lanfeng Hui⁴, Jingzhi Li¹, Hao Zhang¹

Affiliations

¹ Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science and Technology, Tianjin 300457, China.
² Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science and Technology, Tianjin 300457, China. Electronic address: mglz@tust.edu.cn.
³ Department of Biological Systems Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
⁴ Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science and Technology, Tianjin 300457, China. Electronic address: huipeak@163.com.

PMID: 31887866
DOI: 10.1016/j.carbpol.2019.115622

Abstract

In this work, temperature-pressure severally controlled explosion pretreatment (TPE) was proposed to pretreat poplar chips to improve the cellulase hydrolysis yield. In TPE process, native poplar chips (NP) were mixed with steam and N₂ under pressure of 2.6, 2.8 and 3.0 MPa at 209 °C for 7 min. Meanwhile, steam explosion (SE) was also used to pretreat poplar chips for comparison at 209 °C (1.9 MPa) for 7 min. Results showed that the contents of hemicellulose and lignin were decreased from 19.4 % to 4.6 % and from 27.8 %-19.5 % with increasing pressure, respectively. For cellulase hydrolysis process, TPE was more advantageous than SE due to lower contents of hemicellulose and lignin, resulting in a higher cellulose conversion (40.7 %) in relation to SE sample (34.9 %). The Langmuir isothermal- type equation expressed the factors related to the hydrolysis capacity, and the results showed that this model can well describe the kinetics of the enzymatic hydrolysis.

Keywords: Cellulose; Enzymatic; Hemicellulose; Hydrolysis; Lignin; Temperature-pressure severally controlled explosion.