1 Phenolic Ethers Alkyl Phenolics Heterocyclic Ethers Larger PAH 500 600 700 800 900 Figure 1 Formation of biomass tars and example of compounds formed ID: 190318
Download Pdf The PPT/PDF document "Tar is a complex mixture of condensable ..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
1 Tar is a complex mixture of condensable hydrocarbons and many definitions of biomass tar have been given by as many institutions working on biomass gasification. Within the European project on standardization of measuring tar a consensus on the definition was agreed, being all organic hydrocarbons higher than benzene, (for more information, see www.tarweb.net When biomass is heated the molecular bonds of the biomass break; the smallest molecules gaseous, the larger molecules are called primary tars. These primary tars, which are always fragments of the original material, can react to secondary tars by further reactions at the same temperature and to tertiary tars at high temperature. One pathway for tar formation can be visualised as follows: Mixed Ogygenates Phenolic Ethers Alkyl Phenolics Heterocyclic Ethers Larger PAH 500 600 700 800 900 Figure 1 Formation of biomass tars and example of compounds formed