A review of the chemistry for catalytic cracking of heavy oils

The chemistry of catalytic cracking of heavy oils is basic and essential to the research, use and development of advanced catalytic cracking technique s for heavy oils. The effect of physic-chemical characteristics of heavy oi ls on the catalytic cracking process were discussed. The researches on chem ical composition and structure of heavy oils were summarized in terms of se paration methods and the determination of chemical composition and structur al parameters. Studies and developments of the chemistry of catalytic crack ing of heavy oils were reviewed in this paper. At last some problems to be resolved about the feed, catalyst, processing and regeneration were put for ward based on information in hand.