Industrial Progress: New Energy-Efficient Absorbents for the CO₂ Separation from Natural Gas, Syngas and Flue Gas

Jörn Rolker, Matthias Seiler
DOI: 10.4236/aces.2011.14039                

Abstract

The CO₂ separation from natural gas, syngas or flue gas represents an important industrial field of applications. An economic and energy-efficient CO₂ separation from these gas streams is a prerequisite for sustainable 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 absorbent. 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 recent industrial absorbent requirements and allow for more efficient or new CO₂ separation processes.

Keywords

Absorbent, CO2, Energy Efficiency, Sustainability, Operational Expenditure, Separation, Capture

Conflicts of Interest

The authors declare no conflicts of interest.

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