Process development,process simulation and energy calculation of integrated utilization of woody biomass

Completing full utilization of the biomass feedstock is what the current biorefinery needs to solve.Compared with cellulose and lignin,hemicellulose exhibits a higher susceptibility to depolymerization.In this paper,a biorefinery process is developed for the fractionation of oil-tea camellia fruit shell wastes into three main products.A scale-up experiment was first carried out in this paper.Oil-tea camellia fruit shell wastes were first hydrolyzed in a C6H8O7/H2O system to remove the hemicellulose.The aqueous fraction comprises monosaccharides and oligosaccharides,achieving a hemicellulose removal efficiency of 79.7%.Lignin was extracted from the residual solids using an ethanol/isopropanol solvent system with a purity of 87.81%.The three products obtained have potential applications in feed,cultivation substrates and sterilizers.Then given the energy-intensive nature of pretreatment,energy consumption of the process was assessed via process simulation software.The water evaporation utilities account for approximately 62%of the overall energy consumption.When the pretreatment reaction is conducted at 130°C with a raw material to water mass ratio of 1:3,energy consumption can be optimized to 0.2140 t/t.With the adoption of reaction liquid recycling,energy consumption can be further reduced to 0.1763 t/t.The pretreatment reaction temperature and the mass ratio of raw material to water have an effect on energy consumption,with the latter exerting a slightly greater influence.Specifically,at a reaction temperature of 130°C and a mass ratio of raw material to water of 1:3,energy consumption can be further reduced by approximately 0.05t/t.Under these conditions,when the reaction liquid is recycled once and twice,the energy consumption is reduced by 0.034t/t and 0.037t/t,respectively.This paper outlined a pathway for the integrated utilization of lignocellulose,facilitating the feasibility of engineering calculations for biorefinery processes.