Screening of Pure ILs and DESs for CO₂ Separation, N₂O Separation, and H₂S Separation Processes

Table 2

Henry’s constant of X gas (H_x) in physical absorbents, the density at 298.15 K (ρ_298.15), and the isobaric heat capacity (C_p) of CO₂ absorbents.

Absorbents	T (K)	Hx (bar)	Kx	ρ298.15 (g·cm^−3)	Cp (J·mol^−1·K^−1)
CO 2absorbents
[Emim][BF4]	298.1–343.0	81.1–162.1 [24]		1.283 [25–27]	308.1–324.5 [28–31]
[C2OHmim][BF4]	303.2–353.2	108.0–198.0 [32]		1.330 [33, 34]	439.0–475.0 [28]
[Emim][PF6]	303.2–343.2	61.2–138.7 [11]		1.468 [35]	350.0–368.4 [36]
[Emim][NTf2]	283.1–343.1	25.3–77.1 [37, 38]		1.518 [39–41]	501.2–530.4 [28, 42, 43]
[Emmim][NTf2]	283.1–323.1	28.6–60.5 [37]		1.487 [44]	481.4–498.8 [44]
[Emim][OTf]	303.2–343.2	83.0–158.4 [11]		1.385 [45–47]	380.1–394.6 [48]
[Emim][EtSO4]	283.3–343.1	62.1–184.7 [11]		1.237 [49, 50]	365.0–411.0 [51]
[Emim][Et2PO4]	313.2–333.2	69.9–96.6 [52]		1.145 [53]	470.0–486.0 [54]
[Bmim][BF4]	283.1–344.3	40.8–123.4 [37, 55]		1.201 [56]	357.8–386.3 [57]
[Bmim][PF6]	283.1–348.2	38.7–121.1 [58]		1.367 [59]	398.5–435.1 [60]
[Bmim][NTf2]	293.1–323.1	29.0–49.1 [61]		1.436 [62]	564.1–581.7 [60]
[Bmim][DCA]	298.2–333.3	71.9–102.3 [11]		1.060 [63]	376.6–389.3 [64]
[Bmim][TFA]	298.2–333.4	57.2–90.0 [11]		1.216 [65]	407.9–424.9 [66]
[Bmim][CH3SO4]	293.2–413.2	74.5–335.8 [11]		1.208 [67]	373.0–424.3 [68]
[Bmim][OcSO4]	313.2–343.2	64.8–94.0 [11]		1.068 [40]	655.4–696.5 [69]
[Hmim][BF4]	307.5–322.2	62.6–86.2 [70]		1.145 [71]	435.9–443.4 [72]
[Hmim][PF6]	298.2–323.2	49.0–80.6 [11]		1.291 [73]	423.5–438.7 [74]
[Hmim][NTf2]	293.2–413.2	27.8–122.4 [75]		1.372 [76]	626.2–704.0 [28]
[Omim][BF4]	303.0–323.0	53.9–75.6 [61]		1.103 [71]	501.3–513.6 [77]
[Omim][NTf2]	303.2–353.2	26.0–44.2 [11]		1.321 [65]	741.0–817.0 [28]
[C12 mim][NTf2]	298.2–323.2	32.0–42.0 [11]		1.278 [78]	755.3–774.9 [79]
[BmPy][FAP]	303.2–343.2	25.7–46.1 [11]		1.583 [80]	773.0–803.0 [28]
[BmPy][NTf2]	303.8–344.2	36.6–67.8 [11]		1.394 [81]	592.2–620.0 [32]
[Bmpy][OTf]	303.4–373.2	40.2–205.6 [11]		1.253 [82]	437.8–497.1 [82]
[Bpy][NTf2]	298.2–333.2	32.0–51.7 [83]		1.448 [84]	581.5–597.6 [59]
[Hmpy][NTf2]	283.2–333.2	25.4–46.2 [11]		1.362 [85]	612.1–652.1 [86]
[N4111][NTf2]	282.9–343.0	23.8–70.0 [11]		1.392 [87]	550.2–586.2 [88]
ChCl/urea (1 : 2)	313.0–333.0	123.0–182.0 [89]		1.360 [90–92]	183.2–186.4 [93]
ChCl/EG (1 : 2)	303.2–343.2	243.6–600.5 [94]		1.117 [95]	190.8–202.1 [93]
ChCl/Gly (1 : 2)	303.2–343.2	120.0–344.9 [96]		1.191 [95, 97]	237.7–250.3 [93]
[Emim][Ac]	298.1–348.1	4.3–6.3 [11]	285.0–808.0 [11]	1.099 [98]	322.6–343.0 [99]
[Eeim][Ac]	283.1–348.1	4.3–6.3 [11]	140.0–18.0 [11]	1.076 [100]	442.6–491.8 [99]
[Bmim][Ac]	298.1–348.1	4.0–7.0 [11]	167.0–39.0 [11]	1.052 [101]	381.0–414.0 [66]
Cho[Pro]/PEG200(1 : 2)	298.1–348.1	2.8–3.3 [12, 102]	1.3–1.6 [12, 102]	1.330 [103]	358.3–380.4 [102]
N 2O absorbents
[Bmpy][FAP]	303.1–343.2	0.023–0.042 [104]		1.583 [105]	799.0–812.0 [106]
[P66614][FAP]	303.1–343.2	0.043–0.070 [104]		1.182 [80]	1540.0–1580.0 [107]
[Bmim][FAP]	303.1–343.2	0.026–0.042 [108]		1.624 [109]	737.3–757.8 [110]
[Hmim][FAP]	303.1–343.3	0.022–0.043 [108]		1.550 [111]	764.0–781.2 [74]
[Bmim][NTf2]	298.0–348.0	0.002–0.404 [112]		1.437 [113]	589.1–600.3 [114]
[Bmim][BF4]	298.0–348.0	0.001–0.208 [112]		1.201 [115]	385.6–394.9 [77]
[Bmim][DCA]	293.0–348.0	0.001–0.247 [112]		1.061 [32]	394.1–403.1 [116]
[Bmim][Ac]	293.0–348.0	0.001–0.207 [112]		1.053 [117]	391.6–402.1 [118]
H 2S absorbents
[Bmim][BF4]	303.1–343.1	15.5–33.4 [119]		1.204 [120]	363.1–368.7 [46]
[Bmim][PF6]	303.1–343.1	18.6–33.8 [119]		1.370 [121]	407.7–413.1 [121]
[Bmim][NTf2]	303.1–343.1	13.7–26.6 [119]		1.436 [60]	567.3–572.8 [121]
[Hmim][BF4]	303.1–343.1	12.5–25.7 [122]		1.145 [123]	427.8–433.0 [46]
[Hmim][PF6]	303.1–343.1	17.9–39.7 [122]		1.294 [124]	469.0–476.0 [125]
[Hmim][NTf2]	303.1–343.1	17.4–40.6 [122]		1.371 [126]	631.6–632.9 [127]
[Emim][NTf2]	303.1–353.1	14.8–31.6 [128]		1.518 [25]	525.0–529.0 [106]
[Emim][EtSO4]	303.1–353.1	60.7–133.0 [129]		1.237 [130]	394.4–399.3 [106]
[Omim][NTf2]	303.1–353.1	9.9–19.5 [123]		1.323 [132]	733.0–748.0 [106]
[Omim][PF6]	303.1–353.1	12.2–25.5 [120]		1.235 [133]	536.0–544.0 [125]