title: Emission of volatile aldehydes and ketones from wood pellets under controlled conditions.
abstract: Different qualities of biofuel pellets were made from pine and spruce sawdust according to an industrial experimental design. The fatty/resin acid compositions were determined by gas chromatography-mass spectrometry for both newly produced pellets and those after 2 and 4 weeks of storage. The aldehydes/ketones compositions were determined by high performance liquid chromatography at 0, 2, and 4 weeks. The designs were analyzed for the response variables: total fatty/resin acids and total aldehydes/ketones. The design showed a strong correlation between the pine fraction in the pellets and the fatty/resin acid content but the influence decreased over storage time. The amount of fatty/resin acids decreased approximately 40% during 4 weeks. The influence of drying temperature on the aldehyde/ketone emission of fresh pellets was also shown. The amounts of emitted aldehydes/ketones generally decreased by 45% during storage as a consequence of fatty/resin acid oxidation. The matrices of individual concentrations were subjected to multivariate data analysis. This showed clustering of the different experimental runs and demonstrated the important mechanism of fatty/resin acid conversion.
authors: Unit of Biomass Technology and Chemistry, Swedish University of Agricultural Sciences, KBC-huset, SE-901 87 Umeå, Sweden. mehrdad.arshadi@btk.slu.se
authors: Mehrdad
authors: M
authors: Arshadi
authors: Paul
authors: P
authors: Geladi
authors: Rolf
authors: R
authors: Gref
authors: Pär
authors: P
authors: Fjällström
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000447:Aldehydes / Q000032:analysis*; D056804:Biofuels / Q000032:analysis; D006813:Humidity; D007659:Ketones / Q000032:analysis*; D013696:Temperature; D014934:Wood / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D000447:Aldehydes; D056804:Biofuels; D007659:Ketones