Density and excess molar enthalpy of (2-propanol + glyme) liquid mixtures. Application of the Flory model
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| Format: | Preprint |
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2025
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| _version_ | 1866909916262825984 |
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| author | Alves-Laurentino, João Victor Pazoki, Fatemeh Sanz, Luis Felipe González, Juan Antonio Hevia, Fernando Lozano-Martín, Daniel |
| author_facet | Alves-Laurentino, João Victor Pazoki, Fatemeh Sanz, Luis Felipe González, Juan Antonio Hevia, Fernando Lozano-Martín, Daniel |
| contents | For glymes of general formula CH3O(CH2CH2O)uCH3, with u = 1, 2, 3, 4, the densities of the (2-propanol + glyme) systems at temperatures ranging from (293.15 to 303.15) K and at pressure 0.1 MPa were determined using a DSA 5000 densimeter (from Anton Paar). The corresponding excess molar volumes were calculated from these density measurements. In addition, excess molar enthalpies at 298.15 K and 0.1 MPa were measured using a Tian-Calvet micro-calorimeter. The results show that alkanol-ether interactions are strong but do not contribute significantly to the excess molar enthalpy, as the values are large and positive, and comparable to those of (glyme + n-heptane) systems. The excess molar volumes are small or even negative (in the case of the mixture with u = 4), indicating that they are mainly governed by structural effects. Mixtures with 1-propanol or 2-propanol behave similarly, although interactions between unlike molecules become slightly stronger when 1-propanol is involved. On the other hand, effects related to alcohol self-association play a decisive role in the thermodynamic properties when glymes are replaced by di-n-propyl ether. This is supported by the application of the Flory model, which shows that orientational effects are weak in the studied glyme-containing mixtures but become significantly stronger when di-n-propyl ether is considered. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_17057 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Density and excess molar enthalpy of (2-propanol + glyme) liquid mixtures. Application of the Flory model Alves-Laurentino, João Victor Pazoki, Fatemeh Sanz, Luis Felipe González, Juan Antonio Hevia, Fernando Lozano-Martín, Daniel Chemical Physics For glymes of general formula CH3O(CH2CH2O)uCH3, with u = 1, 2, 3, 4, the densities of the (2-propanol + glyme) systems at temperatures ranging from (293.15 to 303.15) K and at pressure 0.1 MPa were determined using a DSA 5000 densimeter (from Anton Paar). The corresponding excess molar volumes were calculated from these density measurements. In addition, excess molar enthalpies at 298.15 K and 0.1 MPa were measured using a Tian-Calvet micro-calorimeter. The results show that alkanol-ether interactions are strong but do not contribute significantly to the excess molar enthalpy, as the values are large and positive, and comparable to those of (glyme + n-heptane) systems. The excess molar volumes are small or even negative (in the case of the mixture with u = 4), indicating that they are mainly governed by structural effects. Mixtures with 1-propanol or 2-propanol behave similarly, although interactions between unlike molecules become slightly stronger when 1-propanol is involved. On the other hand, effects related to alcohol self-association play a decisive role in the thermodynamic properties when glymes are replaced by di-n-propyl ether. This is supported by the application of the Flory model, which shows that orientational effects are weak in the studied glyme-containing mixtures but become significantly stronger when di-n-propyl ether is considered. |
| title | Density and excess molar enthalpy of (2-propanol + glyme) liquid mixtures. Application of the Flory model |
| topic | Chemical Physics |
| url | https://arxiv.org/abs/2511.17057 |