Hydrogen sulfide
The hydrogen sulfide product will typically contain less than 100 ppm of ammonia,
with only traces of hydrocarbons. Any carbon dioxide present in the sour water feed
will remain in the hydrogen sulfide product.
The hydrogen sulfide is generally available at about 100 psig (6.9 Bar) and 100
ºF (38 ºC) and is saturated with water vapor.
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Waste water treatment unit |
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Stripped Water
The stripped water typically contains less than 50 ppm of free ammonia and less
than 10 ppm of free hydrogen sulfide.
It also will contain traces of phenols and salts which entered with the feed.
Stripped water produced by the WWT Process may be reused or discharged through
downstream treating facilities without problems. It has many reuse possibilities,
including hydroprocessing unit injection water, crude unit desalter water and
process water wash. For example, stripped water from WWT plants has been successfully
reused in ISOCRACKING plants (the Chevron Lummus Global licensed hydrocracking process).
WWT stripper water has been used successfully for many years as hydrocracker injection
water.
The reuse of WWT water is particularly attractive because it reduces net makeup
water requirements and can be an important step toward reducing waste water discharge
rates to treating facilities and to receiving waters.
Ammonia
Ammonia produced as vapor for incineration will typically be scrubbed to reduce
the hydrogen sulfide content to about 1500 ppm. The ammonia will be saturated with
water at the scrubber temperature.
Under normal operating conditions, anhydrous liquid ammonia will have maximum
free hydrogen sulfide and water contents of 5 ppmw and 0.4 Wt.%, respectively.
Typical conditions at the plot limit are a temperature of 100ºF (38ºC)
and a pressure of 200 psig (13.8 Bar). The anhydrous ammonia will contain trace
amounts of mercaptans and oils.
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