Process for producing middle distillates by hydroismerizing and hydrocracking a heavy fraction from a fischer-tropsch effluent
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United States of America Patent
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Apr 29, 2014
Grant Date -
Nov 25, 2010
app pub date -
Jun 3, 2008
filing date -
Jun 12, 2007
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Abstract
A process in which the paraffinic effluent derived from a Fischer-Tropsch synthesis unit is separated to obtain a heavy C5+ fraction, said heavy fraction then being hydrogenated in the presence of a hydrogenation catalyst at a temperature in the range 80° C to 200° C, at a total pressure in the range 0.5 to 6 MPa, at an hourly space velocity in the range 1 to 10 h-1, and at a hydrogen flow rate corresponding to a hydrogen/hydrocarbons volume ratio in the range 5 to 80 NI/I/h, the liquid hydrogenated effluent then being brought into contact with a hydroisomerization/hydrocracking catalyst, with no prior separation step, the hydroisomerized/hydrocracked effluent then being distilled to obtain middle distillates and possibly oil bases.
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