Topic
UNIQUAC
About: UNIQUAC is a research topic. Over the lifetime, 2908 publications have been published within this topic receiving 53973 citations.
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TL;DR: In this paper, the experimental data for vapor-liquid equilibrium of CO 2 in aqueous monoethanolamine solutions are presented for 15, 30, 45 and 60 mass% MEA and from 40 to 120°C.
237 citations
TL;DR: In this paper, the microkinetics for the liquid phase synthesis of methyl tertiary butyl ether (MTBE) from methanol and isobutene using a macroporous sulfonic acid ion exchange resin as catalyst (Amberlyst 15, CVT resin) were determined experimentally in a continuous stirred tank reactor in the temperature range 323-363 K at 2.1 MPa.
215 citations
TL;DR: In this paper, three different excess Gibbs free energy models are evaluated to predict ternary liquid-phase behavior in systems that contain ionic liquids (ILs) from binary measurements.
Abstract: Characterization of liquid−liquid equilibrium (LLE) in systems that contain ionic liquids (ILs) is important in evaluating ILs as candidates for replacing traditional extraction and separation solvents. Although an increasing amount of experimental LLE data is becoming available, comprehensive coverage of ternary liquid-phase behavior via experimental observation is impossible. Therefore, it is important to model the LLE of mixtures that contain ILs. Experimental binary and ternary LLE data that involve ILs can be correlated using standard excess Gibbs energy models. However, the predictive capability of these models in this context has not been widely studied. In this paper, we study the effectiveness with which excess Gibbs energy models can be used to predict ternary LLE solely from binary measurements. This is a stringent test of the suitability of various models for describing LLE in systems that contain ILs. Three different excess Gibbs free energy models are evaluated: the non-random two-liquid (N...
213 citations
TL;DR: The experimental VLE and HE data were correlated together with available activity coefficients at infinite dilution γi∞ using the NRTL and UNIQUAC models and the relative van der Waals volume and surface area parameters r and q estimated by the Bondi method as mentioned in this paper.
208 citations
TL;DR: In this paper, a van der Waals free volume expression was derived for predicting solvent activities in polymer solutions without any energy interactions, and for polymer solutions with energy interactions a UNIQUAC residual term was added.
Abstract: A new equation for an activity coefficient which includes combinatorial and free volume contributions has been derived from a van der Waals free volume type of expression. The new expression is analogous to the Flory-Huggins combinatorial term. The new free volume activity coefficient is superior to the Flory-Huggins combinatorial in predicting solvent activities in polymer solutions without any energy interactions. For polymer solutions with energy interactions a UNIQUAC residual term is added
197 citations