Studies On Characteristics And Pyrolysis Of Xinjiang Oil Sand

The Xinjiang oil sand was chosed as the object of study in the paper. The oil content andsand content was obtainted by Dean-Stark separation method. The bitumen and sand werepicked up by toluene extraction and the bitumen from oil sand was separated into fourcomponents: asphaltenes, saturates, aromatics and resins. The research was studied aboutelement composition, VPO molecular weight, surface tension, IR spectrum and meandipolement polarity of bitumen and its fracions. The colloidal stability of bitumen wascharacterised by three methods. Further study was about the distribution of sediment size,surface wetting properties, Zeta potential between sediment and oil. The pyrolysis propertiesof oil sand, bitumen, sediment were studied and the pyrolysis process was dealed with thekinetic equation, which obtained the kinetic parameters.The resulted indicated that the oil content of Xinjiang oil sand was13%, the mineral withhigh oil content, which was suitable for industry development. The compositon of asphalt andresins was above50%, and the ratio of H/C was similar with the residue of Xinjiang. Threecharacterization methods illustrated that the colloidal stability of bitumen from oil sand arepoor. Sediment studies have shown that sediment particle size contact with the bitumen fromoil sands was under10μm. The wettablity of sediment in toluene solution was significantbetter than in water, which indicated that Xinjiang sediment got a obvious lipophilic. Thecharged nature of sediment surface was affected by the temperature, pH, electrolytes Na+,Ca2+type and concentration. Oil sand pyrolysis process can be divided into three stages: thefirst stage of the oil sands combined with the removal of water and small molecules. Thesecond and third stage were the main oil sand weightlessness temperature range. The secondstage was mainly the volatile and desorption of lignt hydrocarbon compounds. The third stage was the the heavy organics broken up. Activation energy increased from37.43kJ·mol-1to41.05kJ·mol-1with the the heating rate changed from5°C·min-1to20°C·min-1, similar withthe trend of the third stage an the reaction activation energy of the second stage was muchsmaller than the activation energy of the third stage.