Quench oil viscosity control in pyrolysis fractionator
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United States of America Patent
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Mar 2, 1999
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app pub date -
Oct 27, 1997
filing date -
Oct 27, 1997
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Abstract
The viscosity of quench oil circulated in a pyrolysis fractionation unit is controlled by contacting pyrolysis furnace effluent with a slip stream of 0.1-0.5 kg/kg of the quench oil, separating the resulting vapor-liquid mixture to remove tarry liquid, and feeding the remaining vapor to the fractionator. Removing the tarry liquid from the fractionator feed in this manner allows operation of the fractionator with less reflux, a higher bottoms temperature, and more heat recovery at a higher temperature.
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