Biogas upgrading – Review of commercial technologies - SGC
Biogas upgrading – Review of commercial technologies - SGC
Biogas upgrading – Review of commercial technologies - SGC
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<strong>SGC</strong> Rapport 2013:270<br />
The reason for the simplification is the pH at which the reaction is taking place.<br />
There is a significant difference between the absorption capacity <strong>of</strong> the MDEA<br />
alone and the mixture <strong>of</strong> MDEA and PZ. The reason is that the secondary or primary<br />
amines (PZ) have very high reaction rates with CO2 and the ability <strong>of</strong> the system<br />
to react the CO2 further with the tertiary amine. The tertiary amine on the other<br />
hand has relatively low heat <strong>of</strong> reaction, making the regeneration affordable from<br />
an energy standpoint (Bishnoi & Rochelle 2000).<br />
Amine scrubbing for biogas <strong>upgrading</strong> is today a mature technology, but the<br />
technology is still developing. New process designs have been suggested in which<br />
double absorption columns are used, one <strong>of</strong> which is pressurized to increase the<br />
solubility <strong>of</strong> carbon dioxide in the solvent and thus increase the separation <strong>of</strong> the<br />
gases (Dreyer & Bosse Kraftwerke GmbH n.d.). These systems are not yet <strong>commercial</strong>ised<br />
and it is, at the time <strong>of</strong> writing this report, difficult to estimate the potential<br />
impact <strong>of</strong> these new process designs. An amine scrubber used for biogas<br />
<strong>upgrading</strong> today is shown in Figure 4.<br />
Figure 4 An amine scrubber used for biogas <strong>upgrading</strong> in Sweden. Image from<br />
Purac Puregas.<br />
Svenskt Gastekniskt Center AB, Malmö <strong>–</strong> www.sgc.se 19
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