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- W163440221 abstract "Trends in quality of crude feedstocks to US refineries and the problems in processing and utilization caused by the changing feed quality were reviewed. The quality of feedstocks declined in the period 1978 to 1985. This is shown, for example, by declining in API gravity from 34.3 to 32.4 and an increase in sulfur content from 0.78 to 0.91%. The lower quality was due primarily to a decline in quality of imported rather than domestic crudes. The shift in crude quality was not caused by a shortage of conventional crude, but resulted from economic factors which encouraged the utilization of cheaper heavier crudes. While domestic throughput decreased significantly during this period, the fraction of the residual material being upgraded increased. The increased conversion was driven by heavier feedstocks, a sustained demand for distillate products, a decreased demand for residual fuels, and an increased conversion capacity by industry. The majority of the upgrading relied largely on carbon rejection techniques. A variety of problems are associated with the utilization of lower quality feedstocks and increased resid processing. These include both problems in the refinery and problems with product quality. The understanding of fundamental petroleum chemistry of heavy crudes and resids is inadequatemore » to predict their processing behavior. Processing flexibility for resids from heavy crudes is limited due largely to their metals content and propensity for coke formation. Other problems discussed include those with desalting, naphthenic acids, hydrotreating, cat cracking, and thermal operations. The change in feedstock quality and increased resid upgrading did not negatively affect overall gasoline quality, but have negatively affected quality of heavier fuels. Heavier feedstocks and increased resid processing result in more aromatic diesel cuts with poorer diesel ignition quality. 24 refs., 11 figs., 2 tabs.« less" @default.
- W163440221 created "2016-06-24" @default.
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- W163440221 date "1987-01-01" @default.
- W163440221 modified "2023-09-27" @default.
- W163440221 title "Trends in refinery feedstock properties and refining problems: Topical report" @default.
- W163440221 hasPublicationYear "1987" @default.
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