Magnetochemical Studies on the Carbonization of Heavy Oils (Part 1)

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  • 重質油の炭化に関する磁気化学的研究　Ｉ　　重質油中のバナジル化合物の熱的挙動とアルカリ金属の添加効果
  • 重質油中のバナジル化合物の熱的挙動とアルカリ金属の添加効果

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The chemical structure of vanadyl complexes contained in petroleum heavy oils and the structural change of the chelate complexes during the carbonization process were investigated from ESR spectral parameters. Most of vanadyl porphyrin complexes occurring in original residues from Gach Saran crude oil and Athabasca tar sand bitumen were found to convert at the temperature ranging from 410 to 510°C, in to the new vanadyl complexes, to which the four donor atoms of the ligands are to be sulfur and nitrogen. The produced complex is considered to be one of the intermediates produced during the thermal decomposition of the vanadyl porphyrin complexes in the residues.<br>The addition of alkali metals (Li, Na, K) accelerates the formation of the intermediate complexes. It can be explained in terms of the formation of the activated compounds such as electron donor-acceptor complexes. The measurement of vanadium content in the benzene extract from Gach Saran residue treated with the alkali metals shows that the intermediate complexes were decomposed to vanadium oxide during the extraction process.

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