Direct fired convection heating in residuum oil solvent extraction process
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United States of America Patent
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Dec 1, 1998
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app pub date -
Sep 8, 1997
filing date -
Sep 8, 1997
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Abstract
A residuum oil solvent extraction process is improved by using direct fired convection heaters for heating the asphaltene, the solvent-deasphalted oil phase, the deasphalted oil and the stripping steam, instead of hot oil heat exchangers. The convection heaters are fired using recirculated flue gas so that the hot flue gas supplied to the convection heaters has a temperature between 800.degree. F. and 1400.degree. F.
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