Performance
Characteristics
Olens Conversion Technology
Lummus Technology’s Olefins Conversion Technology
(OCT) is used to combine n-butenes with ethylene
to produce polymer-grade propylene. Two chemical
reactions take place: propylene is formed by the
metathesis of ethylene and butene-2; and butene-1
is isomerized to butene-2 as butene-2 is consumed
in the metathesis reaction.
Advantages
This technology can be used with a variety of C4
streams including the mixed C4s produced in steam
cracking, raffinate C4s from MTBE or butadiene
extraction, and C4s produced in FCC units.
The OCT process can handle a wide range of
feedstock compositions, making the unit flexible to
take advantage of many lower-value feedstocks. The
ethylene stream can vary from dilute ethylene,
typical from an FCC, to polymer-grade ethylene.
The C4 stream has similar flexibility because
butanes pass through the system as inerts.
Another important characteristic of the process
is product purification: the system does not
require the superfractionator usually associated with propylene purification. Both C2
and C4 feeds generally have only minor quantities of propane, and since the reaction system
does not generate any propane, propane
/propylene separation is not required.
The propylene produced contains only the
propane contained in the ethylene or C4 feed.
This means that the propylene purity usually
exceeds the polymer-grade level produced by
the majority of steam crackers, without any
superfractionators.
When integrated with a grassroots steam cracker, the
by-product flexibility of the cracker is greatly
enhanced. With high propylene value and
demand, the OCT unit can be operated to
increase the propylene-to-ethylene ratio to
above 1.0. Importing an external C4 stream can
further increase the ratio. Should propylene value
fall, the steam cracker is able to produce as much
as 115% of its nameplate ethylene capacity
while exporting either a mixed C4 stream or a C4
stream where the butadiene has been hydrogenated to butenes. Operation can thereby be optimized depending on the relative values of
ethylene, propylene, butene, and mixed C4s. This
product flexibility ensures profitable operation
as by-product values shift over the 30+ year
life-cycle of the facility.
PerformanceCharacteristicsOlens Conversion TechnologyLummus Technology’s Olefins Conversion Technology(OCT) is used to combine n-butenes with ethyleneto produce polymer-grade propylene. Two chemicalreactions take place: propylene is formed by themetathesis of ethylene and butene-2; and butene-1is isomerized to butene-2 as butene-2 is consumedin the metathesis reaction.AdvantagesThis technology can be used with a variety of C4streams including the mixed C4s produced in steamcracking, raffinate C4s from MTBE or butadieneextraction, and C4s produced in FCC units.The OCT process can handle a wide range offeedstock compositions, making the unit flexible totake advantage of many lower-value feedstocks. Theethylene stream can vary from dilute ethylene,typical from an FCC, to polymer-grade ethylene.The C4 stream has similar flexibility becausebutanes pass through the system as inerts.Another important characteristic of the processis product purification: the system does notrequire the superfractionator usually associated with propylene purification. Both C2and C4 feeds generally have only minor quantities of propane, and since the reaction systemdoes not generate any propane, propane/propylene separation is not required.The propylene produced contains only thepropane contained in the ethylene or C4 feed.This means that the propylene purity usuallyexceeds the polymer-grade level produced bythe majority of steam crackers, without anysuperfractionators.When integrated with a grassroots steam cracker, theby-product flexibility of the cracker is greatlyenhanced. With high propylene value anddemand, the OCT unit can be operated toincrease the propylene-to-ethylene ratio toabove 1.0. Importing an external C4 stream canfurther increase the ratio. Should propylene valuefall, the steam cracker is able to produce as muchas 115% of its nameplate ethylene capacitywhile exporting either a mixed C4 stream or a C4stream where the butadiene has been hydrogenated to butenes. Operation can thereby be optimized depending on the relative values ofethylene, propylene, butene, and mixed C4s. Thisproduct flexibility ensures profitable operationas by-product values shift over the 30+ yearlife-cycle of the facility.
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