Therefore, the largest column is usually the demethanizer. This is
a tall, two diameter column with trays for internals
. The natural gas is chilled usually with a turbo expander down to -120
o
F.
What is the purpose of a Deethanizer?
The deethanizer is designed
to take liquid from the low temperature separator (LTS) and remove ethane and lighter components from the liquid
.
How does a demethanizer tower work?
The cooled gas and condensed liquid flow into
the demethanizer tower where the gas rises and the liquid descends. The liquid product exits the bottom of the tower to be further processed as required. The cold residual gas exits the top of the tower and flows through the subcooler and into the gas/gas heat exchanger.
What is a trayed tower?
A vertical process tower for liquid-vapor contacting (as in distillation, absorption, stripping, evaporation, spray drying, dehumidification, humidification, flashing, rectification, dephlegmation), along the height of which is a
series of trays designed to cause intimate contact between the falling liquid and the
…
How tall is a demethanizer tower?
A demethanizer tower — manufactured by Exterran at
186 feet long
, 11 feet in diameter and 535,600 pounds — may be one of the largest objects ever transported on land through Oklahoma.
How does a Depropanizer work?
The depropanizer (DPR) operates at about 250 psia
and separates propane from the butanes and heavier components
. The debutanizer (DBR) operates at about 70 psia and separates the butanes from the gasoline. The deisobutanizer (DIBR) operates at about 85 psia and separates isobutane from normal butane.
How does a Deethanizer work?
The deethanizer
condenser temperature increases rapidly
while the hydrate formation temperature increases slowly with the pressure. Using these characteristics, a high-purity ethane can be obtained by increasing the deethanizer pressure to force the condenser temperature to surpass the hydrate point.
How does a reboiler work?
Reboilers are heat exchangers typically
used to provide heat to the bottom of industrial distillation columns
. They boil the liquid from the bottom of a distillation column to generate vapors which are returned to the column to drive the distillation separation.
What is the difference between tray tower and packed tower?
Packed towers offer a
lower pressure drop
. Tray towers are better at handling solids or other sources of fouling. Tray towers are better at handling lower liquid rates. Packed towers are better for corrosive liquids.
What is the difference between random and structured packing?
Random packing uses a random distribution of small packing materials to assist in the separation process, while structured packing uses
larger, fixed packing structures
. These more formal materials guide the liquid materials through complex structural channels into a specific, fixed shape.
What is Q in Mccabe Thiele method?
The parameter q is
the mole fraction of liquid in the feed
and the slope of the q-line is q / (q – 1). For example, if the feed is a saturated liquid it has no vapor, thus q = 1 and the slope of the q-line is infinite which means the line is vertical.
What is a trim reboiler?
A trim reboiler (not depicted on the diagram) located on the NGL Product outlet
stream facilitates heating changes to control the C1/C2 ratio in the bottoms outlet
. An analysis point on the NGL Product out- let stream is needed to maintain an optimum C1/C2 ratio.
How does a cryogenic gas plant work?
A cryogenic processing plant (aka striping plant) is a facility
where natural gas flowing from wells is cooled to sub-zero temperatures in order to condense liquids or NGLs (natural gas liquids)
. … Typically a plant separates NGLs from natural gas by chilling the gas stream down to around -120 degrees Fahrenheit.
What does a turbo expander do?
A turboexpander is a rotating machine with an expansion turbine
that converts the energy contained in a gas into mechanical work
, much like a steam or gas turbine.
What does Depropanizer mean?
:
to remove propane and sometimes lighter fractions from
(something, such as cracked gasoline) by distillation.
What is a Deisobutanizer?
Deisobutanizer: Deisobutanizer (DIB) is
a superfractionator that separates isobutane (i-C4) from normal butane (n-C4) plus heavier products
. The DIB tower has 80 trays which are required to separate the close-boilingpoint components, isobutane and normal butane.
