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02 liquid fuels (sources, properties, recovery,) A thermogravimetric investigation took place into the influences of amount and conditions of the colloid disperse phase, such as asphaltenes and resinous substances on boiling behaviour and evaporation enthalpy important for the design of distillation apparatuses, by heating rates of 5, 10 and 20 Wmin. Measurements are executed on reduced crude, short residue and visbreaker residue with and without various portions of asphaltenes to show their influence. The results are discussed on the basis of an Arrhenius approach considering the influence of heating intensity and activation energy on sampling gravimetric material loss. It is shown that the presence of colloids is needed even for the evaporation enthalpy.
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