Process for converting olefins to distillate fuels
AssigneeUop LLC
InventorsDeng-Yang Jan, Amanda Hickman, Manuela Serban, Eseoghene Jeroro, Joseph A. Montalbano
Life of this patent
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Abstract
A process for oligomerizing an olefin stream with an oligomerization catalyst to produce an oligomerized olefin stream. Oligomerization may comprise a first stage ethylene oligomerization step followed by a second stage oligomerization of the first stage oligomerized olefin to higher olefins. The oligomerized olefin stream can be separated into jet and diesel fuel streams. The olefin stream may be obtained by converting oxygenates to olefins with an MTO catalyst.
Claims19
A process for oligomerizing an olefin stream comprising:
- oligomerizing said olefin stream, as a first stage oligomerization step, with a first stage oligomerization catalyst to provide a first stage oligomerized olefin stream;
- oligomerizing said first stage oligomerized olefin stream, as a second stage oligomerization step, with a second stage oligomerization catalyst to provide a second stage oligomerized olefin stream;
- separating a distillate olefin stream from said second stage oligomerized olefin stream and hydrotreating said distillate olefin stream;
- feeding the hydrotreated distillate olefin stream to a stripper column;
- taking a C9+ paraffin diluent stream from a bottoms stream from said stripper column and charging said diluent stream to said first stage oligomerization step, wherein the diluent stream is provided at a diluent-to-feed weight ratio of 2:1 to 5:1;
- and
- separating an ethylene stream from said first stage oligomerized olefin stream and/or said second stage oligomerized olefin stream and recycling said ethylene stream to the first stage oligomerization step.
A process for converting methanol to distillate fuel comprising:
- contacting an oxygenate stream with a methanol-to-olefin (MTO) catalyst to produce an olefin stream;
- recovering a deoxygenated olefin stream from said olefin stream;
- selectively hydrogenating said deoxygenated olefin stream to produce a selectively hydrogenated olefin stream;
- oligomerizing said selectively hydrogenated olefin stream, as a first stage oligomerization step, with an oligomerization catalyst to produce an oligomerized olefin stream;
- oligomerizing said oligomerized olefin stream, as a second stage oligomerization step, to provide a second stage oligomerized olefin stream;
- separating a distillate olefin stream from said second stage oligomerized olefin stream;
- hydrogenating said distillate olefin stream to provide a hydrogenated distillate olefin stream comprising distillate fuel;
- and
- feeding the hydrogenated distillate olefin stream to a stripper column;
- taking a C9+ paraffin diluent stream from a bottoms stream from said stripper column and charging said diluent stream to said first stage oligomerization step, wherein the diluent stream is provided at a diluent-to-feed weight ratio of 2:1 to 5:1.
A process for converting ethylene to distillate fuel comprising:
- oligomerizing said ethylene stream, as a first stage oligomerization step, with a first stage oligomerization catalyst to produce a first stage oligomerized olefin stream;
- oligomerizing said first stage oligomerized olefin stream, as a second stage oligomerization step, with a second stage oligomerization catalyst to produce a second stage oligomerized olefin stream;
- separating a distillate olefin stream from said second stage oligomerized olefin stream;
- hydrogenating said distillate olefin stream to provide a hydrogenated distillate olefin stream comprising distillate fuel;
- and
- feeding the hydrogenated distillate olefin stream to a stripper column;
- taking a C9+ paraffin diluent stream from a bottoms stream from said stripper column and charging said diluent stream to said first stage oligomerization step, wherein the diluent stream is provided at a diluent-to-feed weight ratio of 2:1 to 5:1.
Dependencies are inferred from the claim text.