Pyrolysis of lipid wastes under different atmospheres: vacuum, nitrogen and methanePyrolysis of lipid wastes under different atmospheres: vacuum, nitrogen and methane Πλήρης Δημοσίευση σε Συνέδριο Conference Full Paper 2019-11-072017enPyrolysis of high acidity olive oil, olive husk oil and animal fat was carried out under different atmospheres (vacuum, N2 and CH4), at constant temperature and different residence times. Bio-oils were the main pyrolysis products, with mass yields from 55.2% to 88.9%. The use of nitrogen or methane atmospheres led to an increase in the formation of gas products (14.1% to 26%), while increasing the residence time resulted in higher yields of gases and solids. The pyrolysis bio-oils contained 54.4% to 88.7% (w/w) of distillable liquids, collected as a light fraction and a heavy fraction. Both fractions were analysed by GC-MS to determine the hydrocarbon profiles and identification of functional groups. Vacuum pyrolysis promoted the formation of low molecular weight liquids while the use of a methane atmosphere increased the relative concentration of aliphatic components in the bio-oil.http://creativecommons.org/licenses/by/4.0/425-4304th International Conference Wastes: Solutions, Treatments and OpportunitiesWASTES - Solutions, Treatments and Opportunities II - Selected papers from the 4th edition of the International Conference Wastes: Solutions, Treatments and Opportunities Durão Luís Gonçalves Margarida Rosal Oliveira Ana Paula Nobre Catarina Mendes Benilde Kolaiti Tereza Κολαϊτη Τερεζα Tsoutsos Theocharis Τσουτσος Θεοχαρης CRC Press/Balkema Methane Pyrolysis Olive oil Wastes