Environmental Engineering Reference
In-Depth Information
Natural gas, naphtha
Fuel oil, coal
H
2
Hydrotreating
Sulfur removal
Steam
Primary
retorming
Steam
O
2
O
2
Primary
retorming
Partial
oxidation
Partial
oxidation
Steam
Steam
Air
Secondary
retorming
H
2
S and COS
removal
Purification
HT shift
conversion
HT shift
conversion
shift conversion
(CoMo cat.)
HT shift
conversion
LT shift
conversion
CO
2
and H
2
S
removal
CO
2
removal
CO
2
removal
Sulfur
removal
Methanation
Liquid nitrogen
scrubbing
Liquid nitrogen
scrubbing
Sulfur
recovery
Pressure swing
adsorption
Molecular
sieves
N
2
N
2
N
2
Puritier
CO
2
CO
2
CO
2
Ammonia synthesis
Ammonia
FIGURE 2.8
Different options for generating and purifying ammonia synthesis gas.
Source
: Repro-
duced with permission from Appl [16].
is then removed) and hydrogen. The fourth step is production of hydrogen
via catalytic methanation, including removal of any small residual amounts
of carbon monoxide or carbon dioxide from the hydrogen. The final step is
to produce the desired end-product ammonia, in which hydrogen is catalyti-
cally reacted with nitrogen (derived from process air) to form anhydrous
Search WWH ::
Custom Search