Abstract
To confirm the prospects for application of pre-corrected pH hydrothermal pretreatment in biorefineries, the effects of pH on the dissolution and degradation efficiency of carbohydrates were studied. The species composition of the hydrolysate was analyzed using high efficiency anion exchange chromatography and UV spectroscopy. The result showed that the greatest balance between the residual solid and total dissolved solids was obtained at pH 4 and 170 °C. Maximum recovery rates of cellulose and lignin were as expected, whereas hemicellulose had the least recovery rate. The hemicellulose extraction rate was 42.19%, and the oligomer form accounted for 93.39% of the product. The physicochemical properties of bamboo with or without pretreatment was characterized. Compared with the traditional hydrothermal pretreatment, the new pretreatment bamboo has higher fiber crystallinity and thermal stability. In the pretreatment process, the fracture of β-aryl ether bond was inhibited and the structural dissociation of lignin was reduced. The physicochemical properties of bamboo was protected while the hemicellulose was extracted efficiently. It provides theoretical support for the efficient utilization of all components of woody biomass.
Highlights
Energy and environmental issues have become a global concern [1,2]
total dissolved solids (TDS) is an important index to measure the degree of degradation of the extract in the effect [34]
The results indicate that the amorphous fraction in bamboo was significantly damaged by pre-corrected pH hydrothermal pretreatment
Summary
Energy and environmental issues have become a global concern [1,2]. The idea of biomass refining resulted from these concerns. Profits from the paper industry are falling in the shrinking global economy along with reduced consumption of newsprint and increased costs of energy investments [5,6]. The pulp and paper industry is facing significant production pressure. One of the most effective ways to diversify the product is to add increased value, eliminate the current predicaments, and increase the competitiveness of the pulp and paper industry. The pattern of the traditional pulping paper industry with pulp and paper as a single product has been altered in the biomass refining model based on biochemical and thermal chemical processes [7,8]
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