Structure Changes Of Asphaltine Oil Sands During Pyrolysis

As the world oil demand growth, oil sands as a non-conventional resource can beused to replace traditional fossil fuels. Because of its rich oil reserves, has receivedthe wide world’s attention. The current international and domestic oil sands bitumenseparation methods have three kinds: Hot alkaline water separation, solvent extractionand pyrolysis carbonization method. Typically, the caustic water separation andsolvent extraction can not be destroyed bitumen structure, the different nature of theoil sands for bitumen. Both the petrochemical or power resources must go through theprocess of pyrolysis. Therefore, the oil sands bitumen the process of physicalchemistry changes in the structure of the characteristic, oil sands a lot of developmentand efficient and clean use of important infrastructure. This document provides aNuclear Magnetic Resonance technology as the major research tool, the6oil sandssamples of the chemical structure characteristics, as well as heat to process thechemical structure change to a detailed study.Through the solid13C Nuclear Magnetic Resonance(NMR) technology to oilsand bitumen of NMR spectrum analysis, get the list of oil sand bitumen qualitystructural features12of the structural skeleton parameters. According to the studyresults of the analysis, the content of the oil sands bitumen is about60%, indicatingthat its chemical structure is mainly to the structure. The grease cartridge, methylenewas the most, mainly appeared in the fatty chain; aromatic carbon content is less than40%, of which protonated aromatic carbons were greater than non-protonatedaromatic carbons. Bridghead aromatic carbon was the most in the non-protonatedaromatic carbons，inferring aromatic carbon in the polycyclic mode. Carbonyl carbonin oil sand bitumen accounted for only an extremely small amount. Althoughaccording to elemental composition，oil sand bitumen could be classified as Type Ikerogen，but there was difference in hydrocarbon generation potential and structurecharacteristics. The oil sand bitumen was not the degradation product of kerogen. By using Soxhlet extraction to extract the oil sand bitumen, obtain all bitumen.The element analysis showed that the main elements of bitumen component for the Cand H elements. Analysis of liquid NMR experiments on oil sand bitumen matterswas obtained,6kinds of oil sand bitumen quality aliphatic content more than70%,with a long straight chain structure model is given priority to, the average chainlength greater than8carbon atoms.Through the analysis of the oil sands pyrolysis gas TG-FTIR spectra, methyleneand methine C-H stretching vibration and methyl C-H in-plane bending wereidentified by FTIR. The carbon structure skeleton parameters of bitumen in differentfinal temperatures were obtained by13C NMR technology, which reveals the changesof chemical structure of tar during pyrolysis. The aromatic carbon increased slightlyand the methylene carbon number reduced greatly, but methyl carbon numberchanges little in aliphatic carbon. Oil potential carbon ratio ST4oil sands is decreasedfrom0.56to0.27, SD oil sands have dropped0.63to0.43. Two experimental resultsto confirm each other and are in good agreement with the.