Pinki Kashyap - Academia.edu (original) (raw)
Papers by Pinki Kashyap
The Journal of Chemical Thermodynamics
Journal of Molecular Liquids
Korean Journal of Chemical Engineering, 2020
− Densities (ρ) for binary mixtures of ethanol (1) + diisopropyl ether (DIPE) or cyclohexane or a... more − Densities (ρ) for binary mixtures of ethanol (1) + diisopropyl ether (DIPE) or cyclohexane or alkane (C 6-C 9) (2) were measured at 298.15 K, 308.15 K and 318.15 K. The excess molar volume () of binary mixtures was calculated using ρ data and correlated with Redlich-Kister polynomial equation. The values for binary mixtures of ethanol (1) + cyclohexane or n-alkane (C 6-C 9) (2) were positive, whereas for ethanol (1) + DIPE (2) these were negative. The magnitude of values follows the order: cyclohexane > n-nonane > n-octane > n-heptane > n-hexane > DIPE. The values have been interpreted qualitatively and also quantitatively in terms of Flory-Treszczanowicz-Benson (FTB) model and Prigogine-Flory-Patterson (PFP) theory. The values predicted using FTB model agree well with experimental values at all mole fractions. But the PFP theory describes well data in ethanol-rich region (x 1 > 0.5) for all binary mixtures and is able to predict the sign of vs x 1 curve for ethanol-lean region (x 1 < 0.5) except for ethanol (1) + nonane (2) mixtures.
Korean Journal of Chemical Engineering, 2020
Asian Journal of Chemistry, 2019
Ultrasonic speeds (u) and refractive indices (n) of the binary liquid mixtures of ethanol with di... more Ultrasonic speeds (u) and refractive indices (n) of the binary liquid mixtures of ethanol with diisopropyl ether (DIPE) or cyclohexane or n-alkane (C6-C9) were experimentally measured from 298.15 to 318.15 K over entire composition range. Using these measurements deviation in ultrasonic speed (Δu), deviation in refractive index (Δn), excess intermolecular free length (Lf E ) and excess isentropic compressibility (Ks E ) were calculated and fitted with Redlich-Kister equation. The Δu values are negative for all binary mixture and magnitude of negative deviation for binary mixture of ethanol and n-alkane decreases as chain length increases. At equimolar composition, Ks E follows the order: n-hexane > n-heptane >n-otcane > n-nonane > diisopropyl ether > cyclohexane. Experimental results were analyzed to understand the various molecular interactions present in the binary mixtures. The u values for all binary liquid solutions were also correlated using different empirical ...
Journal of Molecular Liquids, 2018
Densities, ultrasonic speeds and refractive indices of 2-propanol + n-alkanes (C 6-C 10) systems ... more Densities, ultrasonic speeds and refractive indices of 2-propanol + n-alkanes (C 6-C 10) systems were experimentally determined at 293.15 K to 303.15 K. Calculated excess molar volume, deviation in ultrasonic speed, refractive index, excess isentropic compressibility and excess intermolecular free length were correlated with Redlich-Kister equation. The excess volume was also interpreted by Flory-Treszczanowicz-Benson (FTB) model and Prigogine-Flory-Patterson (PFP) theory. While the excess molar volume were predicted well with FTB model, PFP theory able to describe sign and magnitude of excess molar volume values in propanol rich region but failed to describe in propanol lean region. For the theoretical estimation of ultrasonic speed and refractive index values, various correlation and mixing rules were also applied.
Korean Journal of Chemical Engineering, 2019
Dynamic viscosities (η) of the binary liquid mixtures of 2-propanol (1)+n-alkanes (C 6 , C 7 , C ... more Dynamic viscosities (η) of the binary liquid mixtures of 2-propanol (1)+n-alkanes (C 6 , C 7 , C 9) (2) at T=288.15 K to 303.15 K and ethanol (1)+n-alkanes (C 6 , C 7 , C 8) (2) at T=308.15 K to 318.15 K were experimentally measured over the whole composition range. Experimental values of η were used to compute the deviation in dynamic viscosity (Δη) and these Δη values were correlated with the Redlich-Kister equation. The η values of binary mixtures were also calculated using several empirical correlations and mixing rules like Grunberg-Nissan, Tamura-Kurata, Kati-Chaudhari and McLaughlin-Ubbelohde and found that the Grunberg-Nissan correlation gave the best estimation. The Δη values were also predicted by an approach given by Singh et al. [Indian J Chem 29, 263 (1990)].
Journal of Molecular Liquids, 2020
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Journal of emerging technologies and innovative research, 2018
Non-wood fibre materials offer an opportunity to replace the use of wood fibre in the production ... more Non-wood fibre materials offer an opportunity to replace the use of wood fibre in the production of pulp and paper in countries with insufficient wood fibre. The aim of this study was to evaluate the paper derived from Cymbopogen Caesius grass for its potential use in the paper industry. The physical properties of handmade sheet were analysed. Cymbopogen Caesius grass paper has brightness 27.7%, burst index 6.2 kPm/g , porosity 1600-2000 ml/min, kappa no. 18.4, opacity 99% with tensile strength 31.4 Nm/g and tearing index 4.6 mNm m/g. These characteristics show the suitability of Cymbopogen Caesius grass for pulp and paper production.
Journal of Molecular Liquids, 2020
Abstract Densities (ρ), speeds of sound (u) and refractive indices (n) of system containing diiso... more Abstract Densities (ρ), speeds of sound (u) and refractive indices (n) of system containing diisopropyl ether, ethanol and n-heptane were measured at temperature 298.15 K to 318.15 K and at pressure 0.1 MPa. The values of excess molar volume (VmE), excess speed of sound (uE), deviation in refractive index (Δn), excess isentropic compressibility (κsE), excess intermolecular free length (LfE), and excess available volume (VaE) of the system were calculated using measured data of densities, speeds of sound and refractive indices. The VmE values were fitted to the Singh, Cibulka and Nagata equations. Several analytical models like Rastogi model, Kohler model, Tsao-Smith model, Radojkovic model and Jacob-Fitzner model were applied to estimate VmE values. The values of uE, κsE, LfE, VaE and Δn were also fitted to the Singh equation. Different correlations and models were applied for estimation of sound velocity and refractive index values.
The Journal of Chemical Thermodynamics
Journal of Molecular Liquids
Korean Journal of Chemical Engineering, 2020
− Densities (ρ) for binary mixtures of ethanol (1) + diisopropyl ether (DIPE) or cyclohexane or a... more − Densities (ρ) for binary mixtures of ethanol (1) + diisopropyl ether (DIPE) or cyclohexane or alkane (C 6-C 9) (2) were measured at 298.15 K, 308.15 K and 318.15 K. The excess molar volume () of binary mixtures was calculated using ρ data and correlated with Redlich-Kister polynomial equation. The values for binary mixtures of ethanol (1) + cyclohexane or n-alkane (C 6-C 9) (2) were positive, whereas for ethanol (1) + DIPE (2) these were negative. The magnitude of values follows the order: cyclohexane > n-nonane > n-octane > n-heptane > n-hexane > DIPE. The values have been interpreted qualitatively and also quantitatively in terms of Flory-Treszczanowicz-Benson (FTB) model and Prigogine-Flory-Patterson (PFP) theory. The values predicted using FTB model agree well with experimental values at all mole fractions. But the PFP theory describes well data in ethanol-rich region (x 1 > 0.5) for all binary mixtures and is able to predict the sign of vs x 1 curve for ethanol-lean region (x 1 < 0.5) except for ethanol (1) + nonane (2) mixtures.
Korean Journal of Chemical Engineering, 2020
Asian Journal of Chemistry, 2019
Ultrasonic speeds (u) and refractive indices (n) of the binary liquid mixtures of ethanol with di... more Ultrasonic speeds (u) and refractive indices (n) of the binary liquid mixtures of ethanol with diisopropyl ether (DIPE) or cyclohexane or n-alkane (C6-C9) were experimentally measured from 298.15 to 318.15 K over entire composition range. Using these measurements deviation in ultrasonic speed (Δu), deviation in refractive index (Δn), excess intermolecular free length (Lf E ) and excess isentropic compressibility (Ks E ) were calculated and fitted with Redlich-Kister equation. The Δu values are negative for all binary mixture and magnitude of negative deviation for binary mixture of ethanol and n-alkane decreases as chain length increases. At equimolar composition, Ks E follows the order: n-hexane > n-heptane >n-otcane > n-nonane > diisopropyl ether > cyclohexane. Experimental results were analyzed to understand the various molecular interactions present in the binary mixtures. The u values for all binary liquid solutions were also correlated using different empirical ...
Journal of Molecular Liquids, 2018
Densities, ultrasonic speeds and refractive indices of 2-propanol + n-alkanes (C 6-C 10) systems ... more Densities, ultrasonic speeds and refractive indices of 2-propanol + n-alkanes (C 6-C 10) systems were experimentally determined at 293.15 K to 303.15 K. Calculated excess molar volume, deviation in ultrasonic speed, refractive index, excess isentropic compressibility and excess intermolecular free length were correlated with Redlich-Kister equation. The excess volume was also interpreted by Flory-Treszczanowicz-Benson (FTB) model and Prigogine-Flory-Patterson (PFP) theory. While the excess molar volume were predicted well with FTB model, PFP theory able to describe sign and magnitude of excess molar volume values in propanol rich region but failed to describe in propanol lean region. For the theoretical estimation of ultrasonic speed and refractive index values, various correlation and mixing rules were also applied.
Korean Journal of Chemical Engineering, 2019
Dynamic viscosities (η) of the binary liquid mixtures of 2-propanol (1)+n-alkanes (C 6 , C 7 , C ... more Dynamic viscosities (η) of the binary liquid mixtures of 2-propanol (1)+n-alkanes (C 6 , C 7 , C 9) (2) at T=288.15 K to 303.15 K and ethanol (1)+n-alkanes (C 6 , C 7 , C 8) (2) at T=308.15 K to 318.15 K were experimentally measured over the whole composition range. Experimental values of η were used to compute the deviation in dynamic viscosity (Δη) and these Δη values were correlated with the Redlich-Kister equation. The η values of binary mixtures were also calculated using several empirical correlations and mixing rules like Grunberg-Nissan, Tamura-Kurata, Kati-Chaudhari and McLaughlin-Ubbelohde and found that the Grunberg-Nissan correlation gave the best estimation. The Δη values were also predicted by an approach given by Singh et al. [Indian J Chem 29, 263 (1990)].
Journal of Molecular Liquids, 2020
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Journal of emerging technologies and innovative research, 2018
Non-wood fibre materials offer an opportunity to replace the use of wood fibre in the production ... more Non-wood fibre materials offer an opportunity to replace the use of wood fibre in the production of pulp and paper in countries with insufficient wood fibre. The aim of this study was to evaluate the paper derived from Cymbopogen Caesius grass for its potential use in the paper industry. The physical properties of handmade sheet were analysed. Cymbopogen Caesius grass paper has brightness 27.7%, burst index 6.2 kPm/g , porosity 1600-2000 ml/min, kappa no. 18.4, opacity 99% with tensile strength 31.4 Nm/g and tearing index 4.6 mNm m/g. These characteristics show the suitability of Cymbopogen Caesius grass for pulp and paper production.
Journal of Molecular Liquids, 2020
Abstract Densities (ρ), speeds of sound (u) and refractive indices (n) of system containing diiso... more Abstract Densities (ρ), speeds of sound (u) and refractive indices (n) of system containing diisopropyl ether, ethanol and n-heptane were measured at temperature 298.15 K to 318.15 K and at pressure 0.1 MPa. The values of excess molar volume (VmE), excess speed of sound (uE), deviation in refractive index (Δn), excess isentropic compressibility (κsE), excess intermolecular free length (LfE), and excess available volume (VaE) of the system were calculated using measured data of densities, speeds of sound and refractive indices. The VmE values were fitted to the Singh, Cibulka and Nagata equations. Several analytical models like Rastogi model, Kohler model, Tsao-Smith model, Radojkovic model and Jacob-Fitzner model were applied to estimate VmE values. The values of uE, κsE, LfE, VaE and Δn were also fitted to the Singh equation. Different correlations and models were applied for estimation of sound velocity and refractive index values.