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Thermodynamics of associated solutions—II alcohol-active solvent solutions

✍ Scribed by Show-An Chen; Edward B. Bagley

Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
692 KB
Volume
33
Category
Article
ISSN
0009-2509

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✦ Synopsis

The modlfied Wiehe-Bagley expresslons for GE, He and VE of alcohol-Inert solvent solutions are apphed to alcohol-active solvent solutions Excellent agreement v&h expernnental data IS obtamed, even for HE and VB curves showing a maxunum and mnumum m the composition plots 'l&c alcohol polymerlzatron eqmhbnum constant depends both on the alcohol and solvent The physical mteractio~ parameter IS calculable from pure component properties usmg a proposed correlation equation, wluch 1s supllar to that for alcohol-mert solvent solutions The Kretschmer-Wlebe theory for alcohol-active solvent solutions, which has been formulated mcorrectly, 1s redenved In our theory a chemical lmkmg between the alcohol complex and solvent molecule through hydrogen bonding 1s considered m addition to the self-assoclahon of the alcohol molecules The redenved expression for GE fits well with the experunental data However, the hydrogen bondmg strength between the alcohol and active solvent moIecules calculated 1s negative for the systems mvestlgated, which 1s difficult to be Justdied ENTaowCTlON An active solvent for alcohol was defined[l] as one which contams a strongly electronegative atom which may be either an oxygen atom as m &oxan or m benzaldehyde or a nitrogen atom as m pyruime or plpendme The molecule of an acuve solvent can form a hydrogen bond with a bare hydrogen of a hydroxyl group m the alcohol monomer of polymer The degree of polymenzation of alcohol m such a solvent will be lower than that m mert solvent, because the polymer ends are termmated by active solvent molecules In this work, we c * * ~,,~,B,~OB chem1ca.l potentials at pure states uA.4, UBB colhslon diameters of alcohol and solvent molecules respectively p VEJlVA 19 defined as eqn (11)

📜 SIMILAR VOLUMES

Thermodynamics of associated solutions—I
Thermodynamics of associated solutions—I: Alcohol-inert solvent solutions
✍ Show-An Chen; Edward B. Bagley 📂 Article 📅 1978 🏛 Elsevier Science 🌐 English ⚖ 799 KB

For alcohol-ahphak hydrocarbon solutions, the athermal assoclakd solut~oon theory of Wlehe and Bagley 1s modlfied by mtroducmg a physical interaction term of the Scatchard-Hfidebrand type expression Good fits between the modlfied theory and experunental data for the excess Gibbs free energy of mlxmg

On the thermodynamics of alcohol—hydroca
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✍ Renon Henri; J.M. Prausnitz 📂 Article 📅 1967 🏛 Elsevier Science 🌐 English ⚖ 682 KB

This article critically reconsiders a continuous linear association model based on the work of Flory and Scatchard. The model is used to reduce experimental equilibrium data for solutions of alcohols and saturated hydrocarbons; special attention is given to recent extensive enthalpy data of Van Nes