Hydrogen donor solvent production and use in resid hydrocracking processes
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United States of America Patent
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Sep 29, 2009
Grant Date -
May 17, 2007
app pub date -
Aug 7, 2006
filing date -
Nov 14, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process derived hydrogen donor solvent is used to increase the maximum resid conversion and conversion rate in an ebullated bed resid hydrocracker. The hydrogen donor solvent precursor is produced by hydroreforming reactions within the resid hydrocracker, recovered as the resin fraction from a solvent deasphalting unit, regenerated in a separate hydrotreater reactor, and recycled to the ebullated bed resid hydrocracker. The major advantage of this invention relative to earlier processes is that hydrogen is more efficiently transferred to the resin residual oil in the separate hydrotreater and the hydrogen donor solvent effectively retards the formation of coke precursors at higher ebullated bed resid hydrocracker operating temperatures and resid cracking rates.
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