An assessment on the use of the debye-hückel equation for the thermodynamic modeling of aqueous systems containing polymers and salts

Brazilian Journal of Chemical Engineering

K. C.nascimento Alves¹  P. A. Pessôa Filho¹ 

[1] ,Universidade de São Paulo Escola Politécnica Departamento de Engenharia QuímicaSão Paulo SP ,Brazil

关键词: Thermodynamics;    Gibbs energy;    Aqueous solutions;    Polymer;    Salt;   

DOI  :  10.1590/S0104-66322010000200010

来源: SciELO

【 摘 要 】

In this work, a study on the role of the long-range term of excess Gibbs energy models in the modeling of aqueous systems containing polymers and salts is presented. Four different approaches on how to account for the presence of polymer in the long-range term were considered, and simulations were conducted considering aqueous solutions of three different salts. The analysis of water activity curves showed that, in all cases, a liquid-phase separation may be introduced by the sole presence of the polymer in the long-range term, regardless of how it is taken into account. The results lead to the conclusion that there is no single exact solution for this problem, and that any kind of approach may introduce inconsistencies.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License