PPE 1 (QUART 2) Flashcards
(11 cards)
PRIMARY FRACTIONATOR OR STABILISER
are separated in a fractionating column
the bottom product of which is the heavy cracked oil rich in high
boiling aromatics.
Cracked liquids and gases
PRIMARY FRACTIONATOR OR STABILISER
is also partly used as the quenching medium for the
products from the furnace and partly sold as the carbon black
feedstock (CBFS) due to its heavy aromatic contents.
heavy oil
HYDROGEN SEPARATOR
from this vessel is used in the hydrogenating units, such
as pyrolysis gasoline and butadiene hydrogenation, or as a fuel.
Hydrogen
PRIMARY FRACTIONATOR OR STABILISER
containing hydrocarbons, both saturated and
unsaturated, from methane to C7 hydrocarbons emerge from the top
of the column, which is then compressed and amine (or caustic)
washed to remove hydrogen sulfide and carbon dioxide gases.
Cracked gases
HYDROGEN SEPARATOR
are then passed through a flash
separator vessel, where liquid hydrocarbon gases are separated
from hydrogen at high pressure and low temperature.
Amine or caustic washed gases
FRACTIONATION COLUMNS
The liquified gas mixture from the bottom of the de-ethaniser
is separated from propane and propylene (C3 mixture), which leaves from
the top of the column and enters the propane–propylene fractionator.
Depropaniser:
FRACTIONATION COLUMNS
In this column, propylene is recovered as
the top product and propane as the bottom product.
Propane–propylene separator:
FRACTIONATION COLUMNS
Butane, butenes, and butadiene (C4 mixture) are recovered
as the top product and components heavier than the C4 mixture, i.e., C5
and heavier, are recovered as the pyrolysis gasoline (bottom product).
Debutaniser:
FRACTIONATION COLUMNS
Liquified gases from a hydrogen separator are then
separated from methane in a distillation column where methane (C1)
emerges from the top and is used as a fuel for the cracking furnace.
Demethaniser:
FRACTIONATION COLUMNS
It is also a distillation column that separates ethane and
ethylene mixture (C2 mixture) as the top product from the rest of the liquified gases containing propane, propylene, butane, butylenes, etc.
De-ethaniser:
FRACTIONATION COLUMNS
A C2 mixture from the top of the de-ethaniser
column is then passed through another distillation column that separates
ethylene as the top product and ethane as the bottom product.
Ethane-ethylene separator:
