Table 1 Equations for amine absorption of \(\hbox {CO}_2\) and mineralization regeneration.

From: Experimental study on the cyclic mineralization of CO2 enriched phase after absorption by a novel biphasic absorbent composed of DEEA and AEP

Process

Amine

Equations

References

\(\hbox {CO}_2\) Absorption

Primary/secondary amine

\(\begin{array}{l} R_1R_2NH + CO_2 \Leftrightarrow R_1R_2NH^+COO^- \left( 1 \right) \\ R_1R_2NH^+COO^- + R_1R_2NH \rightarrow R_1R_2NCOO^- + R_1R_2{NH_2}^+ \left( 2 \right) \\ R_1R_2NCOO^- + H_2O \rightarrow R_1R_2NH + HCO_3^- \left( 3 \right) \\ \end{array}\)

36,37,38

Tertiary amine

\(R_1R_2R_3N + CO_2 + H_2O \Leftrightarrow R_1R_2R_3NH^+ + HCO_3^- \left( 4 \right)\)

34,35

Mineralization

\(\begin{array}{l} Ca\left( OH \right) _2 \Leftrightarrow Ca^{2+} + 2OH^- \left( 5 \right) \\ HCO_3^- + OH^- \Leftrightarrow CO_3^{2-} + H_2O \left( 6 \right) \\ Ca^{2+} + CO_3^{2-} \Leftrightarrow CaCO_3 \downarrow \left( 7 \right) \\ \end{array}\)

29

Generalization

Primary/secondary amine

\(R_1R_2{NH_2}^+ + OH^- \rightarrow R_1R_2NH + H_2O \left( 8 \right)\)

31

Tertiary amine

\(R_1R_2R_3NH^+ + OH^- \rightarrow R_1R_2R_3N + H_2O \left( 9 \right)\)

21

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