Figure 1 The relationship between the pKa1 with the inverse temperature of the studied amines, MDEAthis study and MEA.9⯅: MDEA; □: DMAOEOE; ▽: MEA; ■: 2DMAOEE; ◇: PEA; ◆: DBEA; ●: n-2AOE13PDA; ▼: DMAPAPA; Δ: DAOMDPA; ○: 2-MPMDA
Table 2 The pKa2 values for the five studied amines at various temperatures (K)a