An application study of autohydrolysis pretreatment prior to poplar chemi-thermomechanical pulping

Significance Statement

This paper provides an application of autohydrolysis pretreatment prior to poplar chemi-thermomechanical pulping (CTMP) for pulp and paper industry. The extracted hemicelluloses from wood raw materials can be further used for producing high-value bio-based chemicals/ materials, and the autohydrolyzed wood chips can be continuously used for the following high-yield pulping. The above move was based on the concept of the integrated forest biorefinery (IFBR) and that of value prior to pulping (VPP).

This paper finds that autohydrolysis pretreatment prior to chemi-thermomechanical pulping is helpful to realize the full utilization of wood raw materials by recovering the hemicelluloses from the autohydrolysis liquor, while still keeping the good pulping performance in the subsequent chemi-thermomechanical pulping process.

 

An application study of autohydrolysis pretreatment prior to poplar chemi-thermomechanical pulping

Journal Reference

Bioresour Technol. 2014 ;169:155-61.

Hou Q1, Wang Y2, Liu W3, Liu L2, Xu N2, Li Y2.

1Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science & Technology, Tianjin 300457, China. Electronic address: [email protected]

2Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science & Technology, Tianjin 300457, China.and

3Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science & Technology, Tianjin 300457, China; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.

 

Abstract

 This study investigated the autohydrolysis pre-treatment prior to chemi-thermomechanical pulping (CTMP) process including the effects of autohydrolysis pretreatment with a lower severity on characteristics of the autohydrolysis liquor and hydrolyzed chips. The intensity of autohydrolysis, characterized by the severity factor, increased from 1.76 to 3.54, the hydrolyzed chips yield decreased from 99.0% to 86.7% and the xylose extraction yield increased from 0.8% to 44.0%. The content of holocellulose, pentosan and acid soluble lignin remained in the hydrolyzed chips decreased dramatically with increasing the treatment severity. After the autohydrolysis pretreatment, the resultant poplar chemi-thermomechanical pulp with a severity factor of 2.37 could obtain a 15.3 Nm/g tensile index, 58.6% ISO brightness and a 2.39 cm(3)/g bulk.

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