Acta Physico-Chimica Sinica ›› 2020, Vol. 36 ›› Issue (11): 2004014.doi: 10.3866/PKU.WHXB202004014
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Lu Liu, Yuping Xu, Xia Chen, Mei Hong, Jing Tong()
Received:
2020-04-04
Accepted:
2020-04-24
Published:
2020-04-28
Contact:
Jing Tong
E-mail:tongjinglnu@sina.com
Supported by:
MSC2000:
Lu Liu, Yuping Xu, Xia Chen, Mei Hong, Jing Tong. Thermogravimetric Analysis of Enthalpy Variation of 1-Alkyl-3-methylimidazole Chloride[J].Acta Physico-Chimica Sinica, 2020, 36(11): 2004014.
Table 1
Purity and source of the sample materials."
Chemical name | Source | Purification method | Final mole fraction purity |
[C2mim]Cl a | Lanzhou Institute of Chemical Physics | solvent elution | > 0.99 |
[C4mim]Cl b | Lanzhou Institute of Chemical Physics | solvent elution | > 0.99 |
[C6mim]Cl c | Lanzhou Institute of Chemical Physics | solvent elution | > 0.99 |
Fig 1
Plot of 108(m0 ? m) versus (t ? t0) for [Cnmim]Cl (n = 2, 4, 6). From the bottom to top: 443.15 K, 453.15 K, 463.15 K, 473.15 K, 483.15 K, 493.15 K, 503.15 K, respectively. (a) [C2mim]Cl: ■ 443.15 K: y = 1.46 × 10?2 + 5.49 × 10?3x, r2 = 0.9999, sd = 2.27 × 10?2; ● 453.15 K: y = ?3.61 × 10?1 + 1.11 × 10?2x, r2 = 0.9990, sd = 9.44 × 10?2; ▲ 463.15 K: y = ?3.34 × 10?1 + 1.65 × 10?2x, r2 = 0.9978, sd = 1.33 × 10?1; ▼ 473.15 K: y = ?8.90 × 10?1 + 2.80 × 10?2x, r2 = 0.9959, sd = 3.21 × 10?1; ◆ 483.15 K: y = ?1.57 × 10?1 + 5.03 × 10?2x, r2 = 0.9958, sd = 5.84 × 10?1; ◄ 493.15 K: y = ?2.52 × 100 + 9.10 × 10?2x, r2 = 0.9959, sd = 1.05 × 100; ►503.15K: y = ?5.45 × 100 + 1.72 × 10?1x, r2 = 0.9959, sd = 2.01 × 100. (b) [C4mim]Cl: ■ 443.15 K: y = ?5.54 × 10?3 + 6.50 × 10?3x, r2 = 0.9999, sd = 2.04 × 10?2; ● 453.15 K: y = ?4.20 × 10?1 + 1.12 × 10?2x, r2 = 0.9984, sd = 1.18 × 10?1; ▲ 463.15 K: y = ?6.19 × 10?1 + 1.89 × 10?2x, r2 = 0.9949, sd = 2.40 × 10?1; ▼ 473.15 K: y = ?1.23 × 100 + 3.63 × 10?2x, r2 = 0.9944, sd = 4.81 × 10?1; ◆ 483.15 K: y = ?2.46 × 100 + 7.21 × 10?2x, r2 = 0.9935, sd = 1.03 × 100; ◄ 493.15 K: y = ?1.23 × 10?1 + 1.22 × 10?1x, r2 = 0.9999, sd = 2.56 × 10?1; ► 503.15K: y = ?1.38 × 10?1 + 2.48 × 10?1x, r2 = 0.9999, sd = 2.49 × 10?1. (c) [C6mim]Cl: ■ 443.15 K: y = ?1.99 × 10?2 + 7.52 × 10-3x, r2 = 0.9999, sd = 2.58 × 10?2; ● 453.15 K: y = ?6.22 × 10?1 + 1.46 × 10?2x, r2 = 0.9976, sd = 1.91 × 10?1; ▲ 463.15 K: y = ?7.70 × 10?1 + 2.57 × 10?2x, r2 = 0.9958, sd = 2.97 × 10?1; ▼ 473.15 K: y = ?1.65 × 100 + 4.97 × 10?2x, r2 = 0.9947, sd = 6.50 × 10?1; ◆ 483.15 K: y = ?3.12 × 100 + 9.65 × 10?2x, r2 = 0.9946, sd = 1.27 × 100; ◄ 493.15 K: y = ?5.60 × 100 + 1.86 × 10?1x, r2 = 0.9954, sd = 2.26 × 100; ► 503.15K: y = 0.441 × 10?2 + 4.05 × 10?1x, r2 = 0.9996, sd = 1.43 × 100. "
Table 2
Values of –dm/dt for [Cnmim]Cl (n = 2, 4, 6) from 443.15 to 503.15 K."
T/K | 1010(–dm/dt)/(kg·s?1) | r2 | sd | |
[C2mim]Cl | 443.15 | 0.549 ± 0.0171 | 0.9999 | 2.27 × 10?2 |
453.15 | 1.108 ± 0.0259 | 0.9990 | 9.44 × 10?2 | |
463.15 | 1.649 ± 0.0468 | 0.9978 | 1.33 × 10?1 | |
473.15 | 2.801 ± 0.0764 | 0.9959 | 3.21 × 10?1 | |
483.15 | 5.026 ± 0.128 | 0.9958 | 5.84 × 10?1 | |
493.15 | 9.104 ± 0.224 | 0.9959 | 1.05 × 100 | |
503.15 | 17.22 ± 0.406 | 0.9960 | 2.01 × 100 | |
[C4mim]Cl | 443.15 | 0.650 ± 0.0175 | 0.9999 | 2.04 × 10?2 |
453.15 | 1.116 ± 0.0272 | 0.9984 | 1.18 × 10?1 | |
463.15 | 1.894 ± 0.0618 | 0.9950 | 2.40 × 10?1 | |
473.15 | 3.626 ± 0.107 | 0.9946 | 4.81 × 10?1 | |
483.15 | 7.213 ± 0.220 | 0.9937 | 1.03 × 100 | |
493.15 | 12.17 ± 0.0515 | 0.9999 | 2.56 × 10?1 | |
503.15 | 24.79 ± 0.0513 | 1.0000 | 2.49 × 10?1 | |
[C6mim]Cl | 443.15 | 0.752 ± 0.0171 | 0.9999 | 2.58 × 10?2 |
453.15 | 1.464 ± 0.0322 | 0.9976 | 1.91 × 10?1 | |
463.15 | 2.570 ± 0.0720 | 0.9958 | 2.97 × 10?1 | |
473.15 | 4.970 ± 0.142 | 0.9947 | 6.50 × 10?1 | |
483.15 | 9.648 ± 0.271 | 0.9946 | 1.27 × 100 | |
493.15 | 18.57 ± 0.477 | 0.9954 | 2.26 × 100 | |
503.15 | 40.54 ± 0.289 | 0.9996 | 1.43 × 100 |
Table 3
Corresponding data to calculate ln[(?dm/dt)·T1/2] for [Cnmim]Cl (n = 2, 4, 6) from 443.15 to 503.15 K."
T/K | T ?1/K?1 | (T/M)1/2/(K·mol·kg?1)1/2 | 1010υ/(K·mol·kg·s?2)1/2 | ln[(?dm/dt)·T1/2]/(K1/2·kg·s?1) | |
[C2mim]Cl | 443.15 | 0.002256 | 54.98 | 30.18 | ?20.58 |
453.15 | 0.002207 | 55.59 | 61.58 | ?19.87 | |
463.15 | 0.002159 | 56.20 | 92.66 | ?19.46 | |
473.15 | 0.002113 | 56.81 | 159.1 | ?18.92 | |
483.15 | 0.002070 | 57.40 | 288.5 | ?18.32 | |
493.15 | 0.002028 | 58.00 | 528.0 | ?17.72 | |
503.15 | 0.001987 | 58.58 | 1009 | ?17.07 | |
[C4mim]Cl | 443.15 | 0.002256 | 50.96 | 33.12 | ?20.41 |
453.15 | 0.002207 | 51.53 | 57.49 | ?19.86 | |
463.15 | 0.002159 | 52.09 | 98.66 | ?19.32 | |
473.15 | 0.002113 | 52.65 | 190.9 | ?18.66 | |
483.15 | 0.002070 | 53.21 | 383.8 | ?17.96 | |
493.15 | 0.002028 | 53.75 | 654.0 | ?17.43 | |
503.15 | 0.001987 | 54.30 | 1346 | ?16.70 | |
[C6mim]Cl | 443.15 | 0.002256 | 46.75 | 35.18 | ?20.26 |
453.15 | 0.002207 | 47.28 | 69.21 | ?19.59 | |
463.15 | 0.002159 | 47.80 | 122.8 | ?19.01 | |
473.15 | 0.002113 | 48.31 | 240.1 | ?18.34 | |
483.15 | 0.002070 | 48.82 | 471.0 | ?17.67 | |
493.15 | 0.002028 | 49.32 | 915.7 | ?17.00 | |
503.15 | 0.001987 | 49.82 | 2020 | ?16.21 |
Table 4
Parameters of the fitting line (y = a + bx) for [Cnmim]Cl (n = 2, 4, 6) in the plot of ln[(?dm/dt)·T1/2] against T?1."
Chemicals | Intercept(a) | Slope(b) | r2 | sd |
[C2mim]Cl | 8.026 | ?1.269 × 104 | 0.9924 | 1.08 × 10?1 |
[C4mim]Cl | 10.56 | ?1.378 × 104 | 0.9936 | 1.07 × 10?1 |
[C6mim]Cl | 13.11 | ?1.484 × 104 | 0.9939 | 1.12 × 10?1 |
Table 5
The values of ΔHvap(298) for [Cnmim]Thr (n = 2–6), [Cnmim]Pro (n = 2–6) and [Cnmim]Cl (n = 2, 4, 6) at T = 298.15 K."
[Cnmim]Thr (n = 2–6) | ΔHvap(298)/(kJ·mol?1) | [Cnmim]Pro (n = 2–6) | ΔHvap(298)/(kJ·mol?1) | [Cnmim]Cl (n = 2, 4, 6) | ΔHvap(298)/(kJ·mol?1) |
[C2mim]Thr | 122.0 | [C2mim]Pro | 118.6 | [C2mim]Cl | 115.1 |
[C3mim]Thr | 126.0 | [C3mim]Pro | 123.9 | ||
[C4mim]Thr | 130.0 | [C4mim]Pro | 126.8 | [C4mim]Cl | 123.9 |
[C5mim]Thr | 134.0 | [C5mim]Pro | 130.3 | ||
[C6mim]Thr | 138.4 | [C6mim]Pro | 136.5 | [C6mim]Cl | 133.3 |
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