Description :
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The CO2 separation from natural gas, syngas or flue gas represents
an important industrial field of applica- tions. An economic and
energy-efficient CO2 separation from these gas streams is a prerequisite
for sustain- able industry contributions to the megatrends resource
efficiency and globalization of technologies. One way of reducing
operational expenditure for these separation processes is the
development of better performing CO2 absorbents. Although a number
of absorbents for the separation of CO2 from process gas streams exist,
the need for the development of CO2 absorbents with an improved
absorption performance, less corrosion and foaming, no nitrosamine
formation, lower energy requirement and therefore less operational
expenditure remains. Recent industrial activities have led to the
development of novel high-performance CO2 scrubbing agents that
can be employed in numerous industrial processes such as natural
gas treatment, purification of syngas and the scrubbing of flue gas.
The objective of this paper is to introduce these new high-performance
scrubbing agents and to compare their performance with other
state-of-the-art absorbents. It turned out, that the evaluated
absorbents offer high cyclic capacities in the range of 2.4 to 2.6 mol
CO2/kg absorbent and low absorption enthalpies (–30 kJ/mol) allowing
for distinctive savings in the regeneration energy of the absor- bent.
Calculations with the modified Kremser model resulted in a reduction of
the specific reboiler heat duty of 55%. Furthermore, the absorbents are
less corrosive than standard amines as indicated by the measured corrosion
rates of 0.21 mm/y versus 1.18 mm/y for a piperazine/methyldiethanolamine
mixture. Based on new experimental results it is shown how substantial
savings in operational and capital expenditure can be realized due to
favorable absorbent properties. The novel high-performance CO2 system
solutions meet re- cent industrial absorbent requirements and allow for
more efficient or new CO2 separation processes.
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