Krishnaswamy Rajagopal - Academia.edu (original) (raw)
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Dr. Hari Singh Gour University, Sagar (A Central University)
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Papers by Krishnaswamy Rajagopal
![Research paper thumbnail of “Click” Chemistry in a Supramolecular Environment: Stabilization of Organogels by Copper(I)-Catalyzed Azide−Alkyne [3 + 2] Cycloaddition](https://attachments.academia-assets.com/109437533/thumbnails/1.jpg)
](Journal of the American Chemical Society, 2006
Fluid Phase Equilibria, 2001
ABSTRACT
Journal of Chemical & Engineering Data, 2009
The densities of binary mixtures of n-hexadecane and cyclohexane at high pressures were measured ... more The densities of binary mixtures of n-hexadecane and cyclohexane at high pressures were measured in the range of (6.895 to 62.053) MPa at six different temperatures varying from (318.15 to 413.15) K and for eight compositions. The measurements were made by a high-pressure Anton Paar DMA 512 P densimeter integrated with the Ruska 2370 mercury Free PVT System. The densimeter was calibrated using analytical grade toluene, cyclohexane, and n-heptane as calibration fluids. The experimental error of density measurements is estimated as 0.5 kg‚m-3. The measured densities at 348.15 K agree well with the available literature values at different pressures. The excess volumes, thermal expansion, and isothermal compressibility coefficients were obtained from measured densities. All data were correlated successfully with a modified Peng-Robinson equation of state.
Biodiesel is an alternative environmental friendly fuel to Petroleum Diesel (PD). In this work, a... more Biodiesel is an alternative environmental friendly fuel to Petroleum Diesel (PD). In this work, adiabatic compressibility and viscosity of Cotton Seed Oil Methyl Esters (CSOME) and Palm Stearin Methyl Esters (PSME) biodiesels and their blends with PD were investigated as a function of fatty acid profile of biodiesels. Adiabatic compressibility was measured using ultrasonic interferometer of frequency 2 MHz. Viscosity was measured using capillary flow technique. The fatty acid profile was measured using Gas Chromatography (GC) method with Flame Ionization Detector (FID). CSOME biodiesel was rich in unsaturated Fatty Acid Methyl Esters (FAME) and PSME biodiesel in saturated FAME. Adiabatic compressibility decreased linearly in similar fashion at different rates with increase in blend percent of both biodiesels with PD. Viscosity was increased non linearly in similar fashion for both the biodiesel blends with increase in blend percent of biodiesel in PD. Adiabatic compressibility and viscosity were constant in the lower blends irrespective of FAME composition of biodiesels. Significant difference in adiabatic compressibility and viscosity was observed for pure biodiesels. The physical properties, adiabatic compressibility and viscosity were changed in the similar fashion with small difference in values even though having significant structural difference between saturated and unsaturated FAME.
Chromatographia, 1991
Summary The complex intraparticle structure typical of chromatographic column packings has been ... more Summary The complex intraparticle structure typical of chromatographic column packings has been analyzed by use of an equivalent network model which emphasizes pore size distribution and connectivity. Special attention is given as to the way in which diffusion and adsorption interact and display modified peak spreading characteristics according to the morphology of the pore space. This study reveals a very significant increase in the column band broadening over that expected from physical adsorption which can arise from particular distributions of pore sizes. This has implications for designing packings which take advantage of the separating power due to adsorption but do not compromise the resolution of the chromatographic system.
Chemical Engineering Communications, 2009
The in-line scavenging of hydrogen sulfide is the preferred method for minimizing the corrosion a... more The in-line scavenging of hydrogen sulfide is the preferred method for minimizing the corrosion and operational risks in offshore oil production. We model hydrogen sulfide removal from multiphase produced fluids prior to phase separation and processing by injection of triazine solution into their gas phase. Using a kinetic model and multiphase simulator, the flow regimes, amounts, and composition of three phases are determined along the horizontal and vertical flow path from subsea well to separator tank. The flow regimes were found to be slug flow or intermittent flow. The highly reactive triazine is destroyed on contact with water phase flowing near the wall. We have simulated the hydrogen sulfide concentration profiles for different amounts of gas injection. The results are compatible with the available field data from an offshore oil well and are useful in determining the injection rates of expensive chemical scavengers and optimal gas injection rates.
and sharing with colleagues.
and sharing with colleagues.
Journal of the American Chemical Society, 2006
Fluid Phase Equilibria, 2001
ABSTRACT
Journal of Chemical & Engineering Data, 2009
The densities of binary mixtures of n-hexadecane and cyclohexane at high pressures were measured ... more The densities of binary mixtures of n-hexadecane and cyclohexane at high pressures were measured in the range of (6.895 to 62.053) MPa at six different temperatures varying from (318.15 to 413.15) K and for eight compositions. The measurements were made by a high-pressure Anton Paar DMA 512 P densimeter integrated with the Ruska 2370 mercury Free PVT System. The densimeter was calibrated using analytical grade toluene, cyclohexane, and n-heptane as calibration fluids. The experimental error of density measurements is estimated as 0.5 kg‚m-3. The measured densities at 348.15 K agree well with the available literature values at different pressures. The excess volumes, thermal expansion, and isothermal compressibility coefficients were obtained from measured densities. All data were correlated successfully with a modified Peng-Robinson equation of state.
Biodiesel is an alternative environmental friendly fuel to Petroleum Diesel (PD). In this work, a... more Biodiesel is an alternative environmental friendly fuel to Petroleum Diesel (PD). In this work, adiabatic compressibility and viscosity of Cotton Seed Oil Methyl Esters (CSOME) and Palm Stearin Methyl Esters (PSME) biodiesels and their blends with PD were investigated as a function of fatty acid profile of biodiesels. Adiabatic compressibility was measured using ultrasonic interferometer of frequency 2 MHz. Viscosity was measured using capillary flow technique. The fatty acid profile was measured using Gas Chromatography (GC) method with Flame Ionization Detector (FID). CSOME biodiesel was rich in unsaturated Fatty Acid Methyl Esters (FAME) and PSME biodiesel in saturated FAME. Adiabatic compressibility decreased linearly in similar fashion at different rates with increase in blend percent of both biodiesels with PD. Viscosity was increased non linearly in similar fashion for both the biodiesel blends with increase in blend percent of biodiesel in PD. Adiabatic compressibility and viscosity were constant in the lower blends irrespective of FAME composition of biodiesels. Significant difference in adiabatic compressibility and viscosity was observed for pure biodiesels. The physical properties, adiabatic compressibility and viscosity were changed in the similar fashion with small difference in values even though having significant structural difference between saturated and unsaturated FAME.
Chromatographia, 1991
Summary The complex intraparticle structure typical of chromatographic column packings has been ... more Summary The complex intraparticle structure typical of chromatographic column packings has been analyzed by use of an equivalent network model which emphasizes pore size distribution and connectivity. Special attention is given as to the way in which diffusion and adsorption interact and display modified peak spreading characteristics according to the morphology of the pore space. This study reveals a very significant increase in the column band broadening over that expected from physical adsorption which can arise from particular distributions of pore sizes. This has implications for designing packings which take advantage of the separating power due to adsorption but do not compromise the resolution of the chromatographic system.
Chemical Engineering Communications, 2009
The in-line scavenging of hydrogen sulfide is the preferred method for minimizing the corrosion a... more The in-line scavenging of hydrogen sulfide is the preferred method for minimizing the corrosion and operational risks in offshore oil production. We model hydrogen sulfide removal from multiphase produced fluids prior to phase separation and processing by injection of triazine solution into their gas phase. Using a kinetic model and multiphase simulator, the flow regimes, amounts, and composition of three phases are determined along the horizontal and vertical flow path from subsea well to separator tank. The flow regimes were found to be slug flow or intermittent flow. The highly reactive triazine is destroyed on contact with water phase flowing near the wall. We have simulated the hydrogen sulfide concentration profiles for different amounts of gas injection. The results are compatible with the available field data from an offshore oil well and are useful in determining the injection rates of expensive chemical scavengers and optimal gas injection rates.
and sharing with colleagues.
and sharing with colleagues.