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Suman Gahlyan,Sweety Verma,Manju Rani,Sanjeev Maken 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.5
The deviation in viscosity was coupled with respective excess molar volume data to study the molecular interaction in binary mixtures with one associated component. This approach was applied to the experimentally measured viscosity and excess molar volume data of the 2-propanol+hydrocarbons at 298.15 K and 308.15 K. It was suggested that depolymerization power of aromatic hydrocarbon toward 2-propanol as well as strength of intermolecular interactions (electron-donor-acceptor type) between monomer of 2-propanol and aromatics depend on -electron density of the aromatic hydrocarbon. These interactions were further confirmed by FTIR spectroscopy. The viscosity of these binary mixtures was best predicted by Gruenberg-Nissan correlation among the four correlations applied.
Suman Gahlyan,Manju Rani,Inkyu Lee,문일,Sanjeev Kumar Maken 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.1
Excess molar volumes (VmE) have been measured at 303.15 K for 1-propanol+benzene or toluene or o- orm- or p-xylene mixtures using V-shape dilatometer. The VmEvalues, for an equimolar composition, vary in the order:benzene>toluene~m-xylene>o-xylene>p-xylene. The VmEdata have been used to calculate partial molar volumes,excess partial molar volumes, and apparent molar volumes of 1-propanol and aromatic hydrocarbons over the entirerange of composition. The excess volume data have also been interpreted in terms of graph-theoretical approach andPrigogine-Flory-Patterson theory (PFP). While PFP theory fails to predict the VmEvalues for systems with s-shaped VmEversus x1 graph, the VmEvalues calculated by graph theory compare reasonably well with the corresponding experimen-tal values. This graph theory analysis has further yielded information about the state of aggregation of pure compo-nents as well as of the mixtures.
Measurement and correlation of thermodynamic properties of ternary mixtures of oxygenated fuel
Suman Gahlyan,Rekha Devi,Sweety Verma,Manju Rani,박소진,Sanjeev Maken 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.7
Oxygenated fuels are of great interest as these are more energy efficient and environment friendly. Therefore, thermodynamic properties like density, ultrasonic speed and refractive indices of diisopropyl ether+benzene+nhexane mixtures were measured experimentally at 298.15 K, 308.15 K and 318.15 K. Excess properties like volume (Vm E ), isentropic compressibility (KS E), intermolecular free length (Lf E) as well as deviation in ultrasonic speed (u) and refractive index (n) of these mixtures were derived from experimental data. The Vm E values were also fitted to the Singh, Cibulka and Nagata equations, and the same were also predicted using Prigogine-Flory-Patterson theory and four geometrical models from constituent binary Vm E data. The u data were correlated by Nomato, van Dael, impedance dependence correlations and CFT theory at 298.15 K. Lf E and Va E were also calculated using Jacobson free length theory at 298.15 K. The n data were also predicted by Arago-Biot, Gladstone-Dale, Weiner, Heller, Newton, Eyring and John mixing rules.
( Suman Gahlyan ),( Sweety Verma ),( Manju Rani ),( Sanjeev Maken ) 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.4
Excess molar volumes (V<sub>m</sub><sup>E</sup> ) of binary mixtures of 1-propanol or 2-propanol (1) + cyclohexane or n-hexane (2) were measured with V-shaped dilatometer at 303.15 K. The V<sub>m</sub><sup>E</sup> data for these mixtures varied as: 2-propanol > 1-propanol and were higher for cyclohexane than n-hexane for both propanol systems. The experimental data were correlated with Redlich-Kister polynomial. The V<sub>m</sub><sup>E</sup> data were interpreted qualitatively as well as quantitatively in terms of Flory-Treszczanowicz-Benson model and Prigogine-Flory-Patterson theory. Both models correctly described the sign and shape of V<sub>m</sub><sup>E</sup> vs x<sub>1</sub> curves. The values calculated by both the models agree well with the experimental data.
( Suman Gahlyan ),( Sweety Verma ),( Manju Rani ),( Sanjeev Maken ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.4
Viscosity data were measured at 298.15 K and 308.15 K for formamide + 1-propanol, 2-propanol, 1-butanol, 2-methyl-1-propanol or 2-methyl-2-propanol mixtures. For an equimolar mixture, deviation in viscosity follows the sequence: 2-methyl-2-propanol >2-methyl-1-propanol>1-butanol>2-propanol>1-propanol. The viscosity data were further analyzed in terms of graph theory. Free energy of activation was also calculated from experimental viscosity data along with previously reported excess volume data. The deviation in viscosity and free energy of activation were fitted to Redlich-Kister polynomial equation. The viscosity data were also correlated by correlations like Grunberg-Nissan, Tamura-Kurata, Hind- McLaughlin-Ubbelohde, and Katti-Chaudhari relation. Various adjustable parameters, G<sub>12</sub>, T<sub>12</sub>, H<sub>12</sub>, and W<sub>vis</sub>/RT, of various correlations were used to predict viscosity deviation of binary mixtures. Positive value of G<sub>12</sub> indicates strong interaction in the studied systems. Grunberg-Nissan relation has lowest deviation among the four correlations for formamide + 1-propanol or 2-propanol mixtures; and for mixtures of formamide with 1-butanol or 2-methyl-1-propanol, Tamura- Kurata has lowest deviation. Grunberg-Nissan gives lowest deviation for formamide + 2-methyl-2-propanol mixtures.
Gahlyan, Suman,Verma, Sweety,Rani, Manju,Maken, Sanjeev The Korean Institute of Chemical Engineers 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.5
Intermolecular interactions were studied for binary mixtures of 2-propanol + cyclohexane, n-hexane, benzene, toluene, o-, m- and p-xylenes by measuring ultrasonic speeds (u) over the entire range of composition at 298.15 K and 308.15 K. From these results the deviation in ultrasonic speed was calculated. These results were fitted to the Redlich-Kister equation to derive the binary coefficients along with standard deviations between the experimental and calculated data. Acoustic parameters such as excess isentropic compressibility ($K_s^E$), intermolecular free length ($L_f$) and available volume ($V_a$) were also derived from ultrasonic speed data and Jacobson's free length theory. The ultrasonic speed data were correlated by Nomoto's relation, Van Dael's mixing relation, impedance dependence relation, and Schaaff's collision factor theory. Van Dael's relation gives the best prediction of u in the binary mixtures containing aliphatic hydrocarbons. The ultrasonic speed data and isentropic compressibility were further analyzed in terms of Jacobson's free length theory.
Verma Sweety,Gahlyan Suman,Bhagat Payal,Rani Manju,Rana Seetu,Lee Yongjin,Maken Sanjeev 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.3
Reducing carbon emissions has emerged as a critical challenge, and among various methods, solvent-based CO 2 capture technology is the most widely employed. Amines, particularly eff ective solvents for CO 2 capture, play a signifi cant role in this process. To advance this technology, it is essential to understand the thermodynamic properties of the interactions between the constituent components. In this study, we examined the deviation in dynamic viscosity ( Δ ), and the deviation in refractive index ( Δn D ) calculated from the measured and n D data for n -butylamine (NBA) with alkanol systems. The temperature range for our study was 298.15–318.15 K. We utilized the Ab-initio approach for Δ data analysis. Our fi ndings revealed that the depolymerization power of alkanol is dependent on the unlike interactions. Furthermore, we employed various correlations/mixing rules to predict the as well as n D values from the experimental pure components data. The standard deviation was utilized to express the predictive abilities of these correlations.
( Sweety Verma ),( Suman Gahlyan ),( Manju Rani ),( Sanjeev Maken ) 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.5
Refractive index and speeds of sound for the binary mixture of isomer of butanol (1) + cyclohexane, benzene and toluene (2) were measured at 308.15 K. The measured data were used to calculate deviation in refractive index Δn, ultrasonic speed Δu, isentropic compressibility K<sub>s</sub><sup>E</sup>, available volume Va, excess intermolecular free length L<sub>f</sub> and molecular association MA. All the derived properties were correlated with polynomial equation. Ultrasonic speed data were predicted using various empirical correlations like Nomoto, van Dael, impedance dependence and theoretically with Schaaff’s collision factor theory (CFT). Jacobson free length theory (FLT) was used to calculate L<sub>f</sub>. The measured refractive index was also correlated with various mixing rules. The deviation in refractive index Δn and ultrasonic speed Δu was used to determine the intermolecular interactions.
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.
Alkaline Peroxide Pretreatment of Waste Lignocellulosic Sawdust for Total Reducing Sugars
Satish Kumar Singh,Sweety Verma,Ishan Gulati,Suman Gahlyan,Ankur Gaur,Sanjeev Maken The Korean Institute of Chemical Engineers 2023 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.61 No.3
The surge in the oil prices, increasing global population, climate change, and waste management problems are the major issues which have led to the development of biofuels from lignocellulosic wastes. Cellulosic or second generation (2G) bioethanol is produced from lignocellulosic biomass via pretreatment, hydrolysis, and fermentation. Pretreatment of lignocellulose is of considerable interest due to its influence on the technical, economic and environmental sustainability of cellulosic ethanol production. In this study, furniture waste sawdust was subjected to alkaline peroxide (H<sub>2</sub>O<sub>2</sub>) for the production of reducing sugars. Sawdust was pretreated at different concentrations from 1-3% H<sub>2</sub>O<sub>2</sub> (v/v) loadings at a pH of 11.5 for a residence time of 15-240 min at 50, 75 and 90 ℃. Optimum pretreatment conditions, such as time of reaction, operating temperature, and concentration of H<sub>2</sub>O<sub>2</sub>, were varied and evaluated on the basis of the amount of total reducing sugars produced. It was found that the changes in the amount of lignin directly affected the yield of reducing sugars. A maximum of 50% reduction in the lignin composition was obtained, which yielded a maximum of 75.3% total reducing sugars yield and 3.76 g/L of glucose. At optimum pretreatment conditions of 2% H<sub>2</sub>O<sub>2</sub> loading at 75 ℃ for 150 min, 3.46 g/L glucose concentration with a 69.26% total reducing sugars yield was obtained after 48 hr. of the hydrolysis process. Pretreatment resulted in lowering of crystallinity and distortion of the sawdust after the pretreatment, which was further confirmed by XRD and SEM results.