Methods for converting C2+ olefins to higher carbon number olefins
AssigneeExxonMobil Technology and Engineering Company
InventorsMatthew J. Vincent, Keith H. Kuechler
Life of this patent
Estimating the term…
Abstract
A method for producing an isoolefinic stream may include: oligomerizing an ethylene stream to a C4+ olefin stream in a first olefin oligomerization unit comprising a serial reactor and a lights removal column, wherein the C4+ olefin stream contains no greater than 10 wt % of methane, ethylene, and ethane combined; and wherein the ethylene stream contains at least 50 wt % ethylene, at least 2000 wppm ethane, no greater than 1000 wppm of methane, and no greater than 20 wppm each of carbon monoxide and hydrogen; and oligomerizing the C4+ olefin stream and a propylene/C4+ olefin stream in a second oligomerization unit to produce the isoolefinic stream.
Claims20
A method for producing an isoolefinic stream comprising:
- oligomerizing an ethylene stream to a C4+ olefin stream in a first olefin oligomerization unit comprising a reactor and a lights removal column, wherein the C4+ olefin stream contains no greater than 10 wt % of ethylene, and wherein the ethylene stream contains at least 50 wt % ethylene, at least 2000 wppm ethane and no greater than 1000 wppm of methane;
- and
- oligomerizing the C4+ olefin stream and a propylene/C4+ olefin stream in a second oligomerization unit to produce the isoolefinic stream.
A method comprising:
- converting an oxygenate to olefins to produce a raw olefin stream;
- wherein the raw olefin stream comprises ethylene, propylene, and C4+ olefins, wherein at least 10 wt % of all olefins in the raw olefin stream are ethylene,
- separating the raw olefin stream to remove hydrogen, carbon monoxide, propylene and C4+ olefins from the raw olefin stream, and produce an ethylene stream containing at least 50 wt % ethylene at least 2000 wppm ethane and no greater than 1000 wppm of methane, wherein at least 95 wt % of all the ethylene in the raw olefin stream is recovered in the ethylene stream;
- oligomerizing at least a portion of the ethylene stream in a first oligomerization unit to convert at least 90% of the ethylene contained in the ethylene stream to a C4+ olefin stream containing no greater than 10 wt % of methane, ethylene, and ethane combined;
- and
- oligomerizing the C4+ olefin stream and a propylene/C4+ olefin stream in a second oligomerization unit to produce the isoolefinic stream.
A method for producing an isoolefinic stream comprising:
- providing a raw olefin stream comprising ethylene, propylene and C4+ olefins, wherein at least 10 wt % of all olefins in the raw olefin stream are ethylene, and further containing at least 100 wppm of each carbon monoxide and hydrogen;
- separating the raw olefin stream to remove hydrogen, carbon monoxide, propylene and C4+ olefins from the raw olefin stream, and produce an ethylene stream containing at least 50 wt % ethylene, at least 2000 wppm ethane, and no greater than 1000 wppm of methane;
- oligomerizing at least a portion of the ethylene stream in a first olefin oligomerization unit comprising a reactor and a lights removal column, to convert in a single pass through the reactor(s) at least 90% of the ethylene contained in the ethylene stream to a C4+ olefin stream containing no greater than 10 wt % of ethylene;
- and
- oligomerizing at least a portion of each of the propylene and the C4+ olefins removed from the raw olefins stream, and at least a portion of the C4+ stream in a second olefin oligomerization unit comprising a reactor and a fractionation column to produce the isoolefinic stream.
Dependencies are inferred from the claim text.