Background
Hydrogen is one of the main intermediate products largely utilized in
oil and petrochemical industries.
• It is used as a raw material and obtained in some processes as a by-product.
• The off-gas streams contain considerable amount of hydrogen, which are
mostly incinerated in refinery flares as a waste gas.
>Hydrocarbons are converted into hydrogen reformers in order to produce
the hydrogen needed for hydrogen consuming processes.
>Separation of hydrogen from an existing refinery off-gas stream
represents an opportunity to achieve significant cost reductions in refineries
>Cryogenic Technology (CT)
Separation principle:
Cryogenic technology is based on the difference in the relative
component volatility at low temperatures.
Disadvantages:
Extra compressors to increase the pressure at least 20 bar. CO2 separation
is necessary to avoid freezing the CO2 in line at low temperatures.
see simulation
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