Thermal properties of lignocellulosic biomass barley straw
Authors: Iroba, K, L Tabil
Description: Lignocellulosic biomass barley straw is a complex formation of cellulose, hemicellulose, and lignin. The lignin acts as an external crosslink binding hemicellulose and cellulose with cellulose positioned at the inner core of the structure. The lignocellulosic nature provides mechanical strength to plant cell walls, and makes it naturally resistant to the microbial and enzymatic degradation during hydrolysis and fermentation processes. This necessitates pretreatment of lignocellulosic biomass prior to hydrolysis and fermentation. Pretreatment is generally aimed at breaking down of the lignocellulosic matrix. Pretreatment of lignocellulosic biomass involves the application of heat and the response to heat transfer is dependent on thermal properties of the biomass. Therefore, the thermal properties of lignocellulosic biomass were determined. The thermal conductivity was measured using an assembled thermal conductivity probe at temperatures ranging from 25 to 90oC. The specific heat capacity was investigated using the differential scanning calorimetry (DSC) at temperatures ranging from 25 to 90oC. The measurement was done with five levels of ratio (1:4-1:8) of biomass to NaOH solution and three biomass screen size (0.354, 0.8, & 1.6 mm). These are essential thermal properties required for optimization of processes involving heat transfer. Keywords: lignocellulosic biomass, pretreatment, thermal conductivity, specific heat capacity, and thermal diffusivity.
Keywords: lignocellulosic biomass, pretreatment, thermal conductivity, specific heat capacity, and thermal diffusivity
Technical field: technical_fields_app1
Session name: Biological systems