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Verma Sweety,Bhagat Payal,Gahlyan Suman,Rani Manju,Kumar Naveen,Malik Rajesh Kumar,Lee Yongjin,Maken Sanjeev 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.9
As N-isopropyl-2-propanamine+alkanol (C1-C3) systems are potential absorbents for CO2 capture, we measured density (ρ), viscosity (η) and the ultrasonic speed data (u) for N-isopropyl-2-propanamine (DIPA) with alkanol (C1-C3) at T=(298.15 and 308.15) K and 0.1 MPa. The experimental density (ρ), viscosity (η) and ultrasonic speed (u) data were used to derive excess molar volume (V E m), apparent, partial, and excess partial molar volume, deviation in viscosity and deviation in ultrasonic speed, excess isentropic compressibility (K E s). We predicted the V E m values using the Prigogine-Flory-Patterson theory (PFP) and by Nakata and Sakurai model. An Ab initio approach was proposed for the excess isentropic compressibility (K E s) and Δη data which not only reproduces the experimental data but also gives important parameters that describe the extent of depolymerization on mixing and strength of intermolecular interactions.
Excess Gibbs free energy of butyl acetate with cyclohexane and aromatic hydrocarbons at 308.15K
Sanjeev Maken,Naveen Verma,Krishan Chander Singh,Ankur Gaur,Ho-Jun Song,박진원 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.2
Molar excess Gibbs free energies of mixing (CE) for butyl acetate+cyclohexane or benzene or toluene or o- or m- or p-xylene were calculated by using Barker’s method from the measured vapor pressure data by static method at 308.15±0.01 K over the entire composition range. The GE values for the binary mixtures containing cyclohexane or benzene are positive; while these are negative for toluene, o-, m- and p-xylene system over the whole composition range. The GE values of an equimolar mixture for these systems vary in the order: cyclohexane>benzene>o-xylene> m-xylene>p-xylene>toluene. The GE values for these systems were also calculated by Sanchez and Lacome theory using the previously published excess enthalpy and excess volume data. It is found that while values of GE from Sanchez and Lacombe theory are in reasonably good agreement with those calculated by Barker method for m-xylene and pxylene mixtures, agreement is very poor for other systems although they predict the sign of GE data except in the case of mixtures containing benzene
Molar Excess Volume of Butyl Acetate with Cyclohexane or Aromatic Hydrocarbons at 298.15 K
Sanjeev Maken,Ankur Gaur,Naveen Verma,K. C. Singh,Seungmoon Lee,박진원 한국공업화학회 2007 Journal of Industrial and Engineering Chemistry Vol.13 No.7
Molar excess volume (VE) of butyl acetate [BAc](A) + cyclohexane (B), +benzene (B), +toluene (B), +o-, +m- and +p-xylene (B) were measure at 298.15 K over the entire composition range with v-shaped dilatometer. The VE values for binary mixture containing cyclohexane or benzene were found to be positive, while these were negative for the BAc + toluene, +o-, +m- and +p-xylene over the entire composition range. The VE values for an equimolar mixture vary in the order: cyclohexane > benzene > toluene o-xylene > m-xylene > p-xylene. The results are qualitatively explained in terms of the breaking and stretching of dipole-dipole interactions in self-associated BAc and the formation of attractive interactions between polar carboxyl group of butyl acetate and π-electrons of aromatic hydrocarbons.