Different acid pretreatments at room temperature boost selective saccharification of lignocellulose via fast pyrolysis

• Published in: Cellulose (London) Vol. 28; no. 1; pp. 81 - 90
• Main Authors: Zhang, Fan, Xu, Lujiang, Xu, Feixiang, Jiang, Liqun
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 2021; Springer Nature B.V
• Subjects: Acetic acid; Alkaline earth metals; Biomass; Bioorganic Chemistry; Ceramics; Chemical composition; Chemistry; Chemistry and Materials Science; Composites; Formic acid; Glass; High temperature; Hydrochloric acid; Lignocellulose; Natural Materials; Nitric acid; Organic Chemistry; Original Research; Oxalic acid; Phosphoric acid; Physical Chemistry; Polymer Sciences; Pretreatment; Pyrolysis; Refineries; Room temperature; Saccharification; Sugar; Sulfuric acid; Sustainable Development; Levoglucosan; Pyrolysis; Lignocellulose; Acid pretreatment
• ISSN: 0969-0239; 1572-882X
• DOI: 10.1007/s10570-020-03544-5

Fermentable sugars are a group of pivotal intermediates and platform compounds achieved by the conversion of lignocellulose. Fast pyrolysis, as a little-explored way to liberate levoglucosan from biomass, may have a potential capability to overcome the technical barriers and fundamental limitations for efficient saccharification. Pretreatment prior to fast pyrolysis is essential to improve levoglucosan yield from lignocellulose. Contrary to typical high-temperature acid pretreatments, a pretreatment under mild conditions was evaluated and optimized, where different acid (formic acid, acetic acid, oxalic acid, nitric acid, phosphoric acid, sulphuric acid and hydrochloric acid) were employed at room temperature prior to fast pyrolysis of lignocellulose. Due to the alteration of chemical compositions and physical structures of biomass, especially the elimination of alkali and alkaline earth metals, the levoglucosan yield of dilute acid pretreated biomass was improved remarkably as compared with that of raw material, meanwhile claimed that acid pretreatments at room temperature had an enough capability in efficient utilization of biomass. In sum, this study offered a novel and economical strategy for selective saccharification of lignocellulose for industrialized bio-refinery.