Apparatus for measurement of isobaric dew and bubble points and vapor-liquid equilibriums. Methanol-water and water-dioxane systems

Kato, Masahiro; Konishi, Hitoshi; Hirata, Mitsuho

doi:10.1021/je60047a022

Cited by 20 publications

(10 citation statements)

References 7 publications

(11 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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

show abstract

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

View full text Add to dashboard Cite

show abstract

“…The constructions of the feeder and condenser were further modified to prevent the contamination with water from the air. The experimental procedures are the same as in the previous papers (1,3). Tern ¡aera ture was measured by means of a Hewlett-Packard 2804A quartz thermometer with an accuracy of 0021-9568/91/1736-0057602.50/0 0.01 K. The solutions of desired composition were prepared with an accuracy of 0.001 in mole fraction by use of an automatic balance.…”

Section: Methodsmentioning

confidence: 99%

Vapor-liquid equilibria for three binary systems made of methyl ethyl ketone with acetone, methyl acetate, or N-amyl alcohol

Yoshikawa¹,

Kato²

1991

J. Chem. Eng. Data

Self Cite

View full text Add to dashboard Cite

show abstract

“…VLE of (a) methanol (1) -water (2) and (b) ethanol (1) -water (2) with sodium chloride at 1.01 bar with various NaCl molar fractions x NaCl . (a): ( ), ( ), ( ) x NaCl =0.00 [53][54][55], ( ), ( ) x NaCl =0.03 [56,57], x NaCl =0.09 [56] ( ). (b): ( ) x NaCl =0.00 [58], ( ) x NaCl =0.01 [56], ( ), ( ) x NaCl =0.03 [56,57].…”

Section: List Of Tablesmentioning

confidence: 99%

Extension of the group contribution NRTL-PRA EoS for the modeling of mixtures containing light gases and alcohols with water and salts

Neau

Nicolas

Avaullée

2018

Fluid Phase Equilibria

View full text Add to dashboard Cite

. Extension of the group contribution NRTL-PRA EoS for the modeling of mixtures containing light gases and alcohols with water and salts. Fluid Phase Equilibria, Elsevier, 2018, 458, pp.194-210. 10 AbstractThe offshore exploitation of petroleum fluids in normal conditions of pressure and temperature of transport and in presence of salt water is concerned with the prevention of gas hydrate formation, generally thanks to continuous injection of inhibitors, or punctual injection of methanol in start-up and shut-down operations. Hence, models of interest should provide both, satisfactory phase equilibrium estimations of hydrocarbon and alcohol mixtures with water and reliable predictions of their behavior in presence of salts.In this work, the NRTL-PRA EoS is extended to the prediction of phase equilibria in mixtures containing strong electrolytes. The proposed model assumes that the a and b parameters of the cubic EoS only depend on the solvent mole fractions (salt-free), while the E EoS g excess Gibbs energy describes all the interactions between solvents and ions with only two contributions: the SMR term, specific of "Short and Middle Range" interactions between solvents and salts, and the LR relation proposed by Pitzer-Debye-Hückel, for the description of "Long Range" electrostatic interactions. The proposed electrolyte version of the NRTL-PRA model was successfully extended to the modeling of phase behavior of mixtures of light gases at high pressures (methane, carbon dioxide, nitrogen and hydrogen sulfide) and alcohols (methanol, ethanol and 1-propanol) with water and salts (mainly, ternary mixtures containing sodium chloride). As far as possible, results were compared with those provided, for the same systems, by other literature models (cubic Eos, SAFT and CPA equations).

show abstract

Apparatus for measurement of isobaric dew and bubble points and vapor-liquid equilibriums. Methanol-water and water-dioxane systems

Cited by 20 publications

References 7 publications

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

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

Vapor-liquid equilibria for three binary systems made of methyl ethyl ketone with acetone, methyl acetate, or N-amyl alcohol

Extension of the group contribution NRTL-PRA EoS for the modeling of mixtures containing light gases and alcohols with water and salts

Contact Info

Product

Resources

About