Chemistry and Chemical Engineering Research Institute of Iran

Tehrān, Iran

Chemistry and Chemical Engineering Research Institute of Iran

Tehrān, Iran

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Goharshadi E.K.,Ferdowsi University of Mashhad | Imani M.,Chemistry and Chemical Engineering Research Institute of Iran | Rahimi-Zarei R.,Tarbiat Modares University | Razghandi F.,Ferdowsi University of Mashhad | And 2 more authors.
European Polymer Journal | Year: 2010

In this work, the excess thermodynamic properties, namely excess molar Gibbs energy, excess molar enthalpy, excess molar entropy, excess molar internal energy, and excess molar Helmholtz energy for four polymer mixtures and blends at different temperatures, pressures, and compositions have been calculated using the GMA equation of state. We have also calculated the activity coefficient for these polymeric mixtures using the GMA equation of state. The values of statistical parameters between experimental and calculated properties show the ability of this equation of state in reproducing and predicting the excess thermodynamic functions and activity coefficients for studied polymeric mixtures. © 2009 Elsevier Ltd. All rights reserved.


Mortaheb H.R.,Chemistry and Chemical Engineering Research Institute of Iran | Mafi M.,Chemistry and Chemical Engineering Research Institute of Iran | Mokhtarani B.,Chemistry and Chemical Engineering Research Institute of Iran | Khosravi K.,Chemistry and Chemical Engineering Research Institute of Iran | Mashkini F.,Chemistry and Chemical Engineering Research Institute of Iran
Ecletica Quimica | Year: 2010

N-methylpyrrolidone is a powerful solvent for variety of chemical processes due to its vast chemical properties. It has been used in manufacturing processes of polymers, detergents, pharmaceuticals rubber and many more chemical substances. However, it creates large amount of residue in some of these processes which has to be dealt with. Many well known methods such as BASF in rubber producing units have tried to regenerate the solvent at the end of each run, however, there is still discarding of large amount of residue containing NMP, which over time, could cause environmental concerns. In this study, we have tried to optimize regeneration of the NMP extraction from butadiene production. It is shown that at higher temperatures NMP is separated from the residue with close to 90% efficiency, and the solvent residue proved to be the most effective with a 6: 1 ratio.

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