Diene removal from an olefin feedstock
AssigneeShell Oil Company
InventorsPaul B. Himelfarb, Cornelius Mark Bolinger
Life of this patent
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Abstract
The invention pertains to a process of removing dienes from an olefin feedstock. A preferred olefin feedstock is for the production of primary alcohol compositions by skeletal isomerization of the olefins followed by hydroformylation. In this preferred embodiment, the olefin feedstock may be purified before and/or after skeletal isomerization. The olefins in the feedstock preferably have a carbon chain length of about 8 to about 36 carbon atoms, preferably about 10 to about 20 carbon atoms, most preferably about 12 to about 18 carbon atoms.
Claims67
A method for purifying an olefin stream comprising:
- providing an olefin feedstock wherein said olefins have an average molecular chain length of from about 10 to about 20 carbon atoms, said olefin feedstock comprising a quantity of dienes;
- contacting said olefin feedstock with a hydrogenation catalyst that is sensitive to diene poisoning in the presence of a gas feed comprising an inert gas, said gas feed also comprising from about 2 to about 6 vol. % hydrogen, at a feedstock flow rate of about 1 LHSV or less under conditions effective to convert a majority of said dienes to olefins.
The method of claim, 3 wherein said feedstock flow rate is about 0.5 LHSV or less.
A method for purifying an olefin stream comprising:
- providing an olefin feedstock wherein said olefins have an average molecular chain length of from about 8 to about 36 carbon atoms, said olefin feedstock comprising a quantity of dienes;
- contacting said olefin feedstock and a gas feed comprising an inert gas with a hydrogenation catalyst that is sensitive to diene poisoning under conditions effective to produce a purified olefin stream comprising a paraffin content of about 1 wt.% or less, said conditions comprising a quantity of hydrogen in said gas feed of from about 2 to about 6 vol. % and a flow rate of said olefin feedstock, said quantity and said flow rate being sufficiently low to convert a majority of said dienes to olefins.
A method for purifying an olefin stream comprising:
- providing an olefin feedstock wherein said olefins have an average molecular chain length of from about 10 to about 20 carbon atoms and an average number of branches per molecular chain of at least 0.7, said olefin feedstock comprising a quantity of dienes;
- contacting said olefin feedstock with a fixed bed hydrogenation catalyst in the presence of a gas feed comprising an inert gas, said gas feed also comprising from about 2 to about 6 vol. % hydrogen, said hydrogenation catalyst comprising from about 0.05 wt. % to about 0.2 wt. % palladium on alumina, said alumina having a surface area of about 15 m2/g or less, wherein said olefin feedstock has a flow rate through said fixed bed of about 1 LHSV or less under conditions effective to convert a majority of said dienes to olefins.
Dependencies are inferred from the claim text.