Comparison of microwave-assisted zinc chloride hydrate and alkali pretreatments for enhancing eucalyptus enzymatic saccharification. (15th April 2019)

• Record Type: Journal Article
• Authors: Wei, Weiqi; Zhang, Hongdan; Jin, Yongcan
• Is Part Of: Energy conversion and management. Volume 186(2019)
• Page Start: 42
• Page End: 50
• Publication Date: 2019-04-15
• Subjects: Eucalyptus -- Pretreatments -- Enzymatic hydrolysis -- Tween 80; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2019.02.054
• Languages: English
• ISSNs: 0196-8904

Abstract

Graphical abstract: Highlights: Four different pretreatment methods were developed and compared in this study. MW-ZnCl2 ·4H2 O pretreatment was highly effective for enhancing eucalyptus hydrolysis. The pretreatment time can be significantly shortened by using microwave heating. Tween 80 addition not only promoted glucose release but also reduced cellulase dosage. Abstract: In this work, four kinds of pretreatment methods including microwave-assisted ZnCl2 ·4H2 O or NaOH pretreatment, traditional electrical heating ZnCl2 ·4H2 O or NaOH pretreatment were developed and compared for eucalyptus hydrolysis at 100 °C. The effect of various pretreatment methods on hemicellulose and lignin degradation, and as well as subsequent pretreated solids enzymatic saccharification were completely investigated. The results showed that microwave-assisted ZnCl2 ·4H2 O pretreatment was highly successful for enhancing eucalyptus enzymatic saccharification due to the removal of hemicellulose and the change of cellulose crystal structure. The pretreatment time can be significantly shortened from 90 min to 20 min by using microwave irradiation as a heating manner, which means energy saving. The addition of Tween 80 into enzymatic hydrolysis step could remarkably reduce the cellulase dosage while the glucose yields do not decrease. The highest glucose yield of this work was 35.7 g/100 g raw material, which represented 90.6% glucose in eucalyptus feedstock. It could be concluded that combination of ZnCl2 ·4H2 O and microwave irradiation provided an applicable strategy for enhancing sugars release from eucalyptus.