Measurement of isothermal vapor-liquid equilibriums for acetone-n-heptane mixtures using modified Gillespie still

Maripuri, Venkatachalapati O.; Ratcliff, G. A.

doi:10.1021/je60054a031

Cited by 43 publications

(18 citation statements)

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“…The measurement results are summarized together with the literature values in Figure 2 and Table 1 − 167 − data were 0.72% for vapor-phase composition and 0.36 K for boil-ing point. These results are in good agreement with the literature values [11]. Thermodynamic validity of the apparatus was confirmed by the Herington area test [12,13].…”

Section: Validity Of Apparatus For Measuring Vapor-liquid Equilibriumsupporting

confidence: 91%

Salt Effects on Vapor Liquid Equilibrium of Acetic Acid-Water System

Takakura

Sumoge

Araki

et al. 2015

Jpn. J. Thermophys. Prop.

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The vapor-liquid equilibrium of several acetic acid-water-salt systems under atmospheric pressure was determined by employing lithium nitrate, magnesium nitrate, potassium nitrate, and potassium acetate as salts. In the vapor-liquid equilibrium of an acetic acid-water-salt system, lithium nitrate, magnesium nitrate, and potassium nitrate showed a salting-out effect, while potassium acetate showed a salting-in effect. The vapor-liquid equilibria with the nitrate, chloride, bromide, and acetate salts at a salt concentration of 1.0 mol/kg were also determined, and it was shown that by keeping the anion the same and changing the cations of salts with those having a smaller hydration enthalpy showed an increased salting-out effect. Alternatively, when the cation was kept the same, the salts showed the salting-out effect in the following order: chloride > bromide > nitrate > acetate salts; the acetate salt showed a salting-in effect.

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Section: Validity Of Apparatus For Measuring Vapor-liquid Equilibriumsupporting

confidence: 91%

Salt Effects on Vapor Liquid Equilibrium of Acetic Acid-Water System

Takakura

Sumoge

Araki

et al. 2015

Jpn. J. Thermophys. Prop.

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“…The mixtures’ VLE on a solvent-free basis is shown in Figure 1 to observe the azeotrope point and compared with experimental data reported by Maripuri and Ratcliff. 28 This figure demonstrates that the UNIQUAC model is appropriate and comparable to that of the experimental data.…”

Section: Simulation Procedures and Methodssupporting

confidence: 63%

The Design and Optimization of Extractive Distillation for Separating the Acetone/n-Heptane Binary Azeotrope Mixture

Kianinia

Abdoli

2021

ACS Omega

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Acetone and n -heptane are common solvents in the pharmaceutical industry and they have been found in wastewater. Under atmospheric conditions, the mixture of these compounds creates a minimum-boiling azeotrope. The extractive distillation process with a high boiling solvent is commonly utilized to separate the azeotropes in the industry to minimize waste, reuse resources, achieve clean production, and preserve the environment. In this work, extractive distillation was applied to separate the binary azeotropic system of acetone and n -heptane in wastewater using butyl propionate as a solvent. The characteristics of the process are designed and simulated via Aspen Plus. The simulation results showed that to get a distillate containing at least 99.5 mass% acetone, a solvent-to-feed ratio of 1.4, a reflux ratio of 1.5, a number of stages of 30, a feed stage of 26, a solvent stage of 10, and a solvent temperature of 298.15 K were required. The optimum operating parameters of the process were also obtained using the NLP optimization method, with the minimum total annual cost as the objective function. While the process was operating in optimal mode, CO 2 emissions were calculated to be 0.0780 kg CO 2 /kg feed.

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“…The application was tested on a set of 270 zeotropic and azeotropic systems of homogeneous binary solutions and 30 non‐homogeneous systems. In addition to the VLE data, values of the excess properties ( v E and h E ) have been used and, also, LLE data of the system studied, extracted from the literature,…”

Section: Results Of the Testmentioning

confidence: 99%

A rigorous method to evaluate the consistency of experimental data in phase equilibria. Application to VLE and VLLE

2017

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This work forms part of a broader study that describes a methodology to validate experimental data of phase equilibria for multicomponent systems from a thermodynamic‐mathematical perspective. The goal of this article is to present and justify this method and to study its application to vapor–liquid equilibria (VLE) and vapor–liquid–liquid equilibria (VLLE), obtained under isobaric/isothermal conditions. A procedure based on the Gibbs‐Duhem equation is established which presents two independent calculation paths for its resolution: (a) an integral method and (b) a differential method. Functions are generated for both cases that establish the verification or consistency of data, δψ for the integral test and δζ for the differential approach, which are statistically evaluated by their corresponding average values [ δtrueψ¯, δtrueζ¯], and the standard deviations [ strue(δψtrue), strue(δζtrue)]. The evaluation of these parameters for application to real cases is carried out using a set of hypothetical systems (with data generated artificially), for which the values are adequately changed to determine their influence on the method. In this way, the requirements of the proposed method for the data are evaluated and their behavior in response to any disruption in the canonical variables (p,T, phase compositions). The conditions for thermodynamic consistency of data are: δtrueψ¯<2, strue(δψtrue)<0.2, δtrueζ¯<5, and s(δξ)<0.2. In systems with VLLE, in addition to the previous criteria, must occur that: δxLLE<0.05 and δTLLE<0.5 K. The new proposed method has been tested with a set of 300 experimental binary systems, biphasic and triphasic, obtained from published bibliography, and the results are compared with those of other tests commonly used for testing thermodynamic consistency. The results show that the greater rigor of the proposed method is mainly due to the simultaneous verification of various independent variables. As a result, the conditions for the new test are verified for fewer systems than using other tests mentioned in the literature (i.e., Fredenslund‐test and direct of Van Ness). Its unique application is sufficient to ensure the consistency of experimental data, without using other tests. © 2017 American Institute of Chemical Engineers AIChE J, 2017

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Measurement of isothermal vapor-liquid equilibriums for acetone-n-heptane mixtures using modified Gillespie still

Cited by 43 publications

References 1 publication

Salt Effects on Vapor Liquid Equilibrium of Acetic Acid-Water System

Salt Effects on Vapor Liquid Equilibrium of Acetic Acid-Water System

The Design and Optimization of Extractive Distillation for Separating the Acetone/n-Heptane Binary Azeotrope Mixture

A rigorous method to evaluate the consistency of experimental data in phase equilibria. Application to VLE and VLLE

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