Fig. 6. Yield of hemicelluloses (A) and celluloses extracted (B) after the hydrolysis process using nine Nafamostat of urban trees at 250 °C.Figure optionsDownload full-size imageDownload as PowerPoint slide
3.4. Solid products
Amount and characterization of solid obtained after the hydrothermal process.BiomassSolid after hydrolysis (g/g biomass)Lignin content (g/g biomass)Linden0.250.41Plane0.140.63Eucalyptus0.110.56Catalpa0.100.69Holm Oak0.320.32Maple0.150.56Almond0.190.63Pine0.170.92Cedar0.110.78Full-size tableTable optionsView in workspaceDownload as CSV
3.5. Heat integration
The use of high temperatures and pressures in this process leads to the realistic solutions to make the process more economically and energetically efficient. For this reason, the use of a heat exchanger to recover energy was installed (E-01, Fig. 1). The reaction temperature was 250 °C and the flow was 10 ml/min. The overall heat transfer coefficient (U) was 1674 W m−2 °C−1 and the heat recovery was as high as 95.6%. The high heat recovery is an important point when analyzing the scale up. Practically very low demand of heat is required by the system to work. The second heat exchanger (E-03, Fig. 1) was not used because the temperature of outlet stream was between 35 and 40 °C.