Density Measurements for Ethane, Carbon Dioxide, and Methane + Nitrogen Mixtures from 300 to 470 K up to 137 MPa Using a Vibrating Tube Densimeter

2016 ◽  
Vol 61 (8) ◽  
pp. 2791-2798 ◽  
Author(s):  
Martin A. Gomez-Osorio ◽  
Robert A. Browne ◽  
Mauricio Carvajal Diaz ◽  
Kenneth R. Hall ◽  
James C. Holste
Keyword(s):  
Carbon Dioxide ◽  
Density Measurements ◽  
Vibrating Tube Densimeter

scholarly journals Investigation of the thermodynamic properties of the binary system vitamin K3/carbon dioxide

2017 ◽  
Vol 23 (4) ◽  
pp. 563-571
Author(s):  
Nina Trupej ◽  
Masa Knez-Hrncic ◽  
Mojca Skerget ◽  
Zeljko Knez
Keyword(s):  
Carbon Dioxide ◽  
Binary System ◽  
Thermodynamic Properties ◽  
Partial Molar Volumes ◽  
Analytic Method ◽  
Vitamin K3 ◽  
Molar Volumes ◽  
Vibrating Tube Densimeter ◽  
A Minor

The binary system of vitamin K3 and CO2 was investigated at temperatures of 40, 60 and 80 ?C up to a pressure of 40 MPa. Solubility was measured by a static-analytic method. Partial molar volumes were determined by a method involving a vibrating tube densimeter. The solubility of vitamin K3 in CO2 is found as a function of pressure and temperature. The highest solubility (31.16?10-4 mol?mol-1) was attained at a pressure of 25.40 MPa at temperature of 40?C. However, at temperature of 60?C and a pressure of 24.02 MPa, the solubility was 18.79?10-4 mol?mol-1. Solubility was lower at a temperature of 80?C and a pressure of 22.06 MPa (6.48?10-4 mol?mol-1). The partial molar volumes are negative and the dissolved vitamin K3 has a minor impact on the density of the solution of K3 in CO2 compared to the density of the pure CO2.

scholarly journals Calibration Fluids and Calibration Equations: How Choices May Affect the Results of Density Measurements Made with U-Tube Densimeters

2018 ◽  
Vol 123 ◽  
Author(s):  
Stephanie L. Outcalt
Keyword(s):  
Calibration Equation ◽  
Density Measurements ◽  
Vibrating Tube Densimeter ◽  
Calibration Equations ◽  
Analyze Data

Data on the calibration fluids water and toluene individually, and the combination of those two sets of data, were correlated with two different equations (resulting in six sets of calibration equation parameters) to analyze data measured with a vibrating-tube densimeter on the lubricants pentaerythritol tetrapentanoate (POE5), pentaerythritol tetraheptanoate (POE7), and pentaerythritol tetranonanoate (POE9) at temperatures from 270 K to 470 K and pressures from 0.5 MPa to 50 MPa. The objective was to explore how the calculated densities of the lubricants would differ based on the calibration equations and calibration fluid(s). The viscosities of the measured lubricants are much greater than those of the calibration fluids, and because there has long been a question of how measurements of higher viscosity fluids are affected when measured with a vibrating-tube densimeter, combinations of calibration fluid(s) and equations were tested to explore the role they play in obtaining accurate results. For the lubricants studied herein, more accurate results were obtained with a calibration fitted to multiple calibration fluids, while the consistency of results was more equation dependent.

Thermodynamics of aqueous carbon dioxide and sulfur dioxide: heat capacities, volumes, and the temperature dependence of ionization

1983 ◽  
Vol 61 (11) ◽  
pp. 2509-2519 ◽  
Author(s):  
José A. Barbero ◽  
Loren G. Hepler ◽  
Keith G. McCurdy ◽  
Peter R. Tremaine
Keyword(s):  
Experimental Data ◽  
Carbon Dioxide ◽  
Infinite Dilution ◽  
Heat Capacities ◽  
Standard State ◽  
Apparent Molar Heat Capacities ◽  
Experimental Heat ◽  
Chemical Relaxation ◽  
Vibrating Tube Densimeter ◽  
New Equation

A flow microcalorimeter and vibrating tube densimeter were used at 25 °C to obtain apparent molar heat capacities and volumes of aqueous NaHCO3, KHCO3, NaHSO3, and KHSO3, from 0.1 to 1.0 mol kg−1, aqueous CO2 from 0.01 to 0.10 mol kg−1 and aqueous SO2 from 0.045 to 2.0 mol kg−1. The contribution of "chemical relaxation" (changes in equilibrium state and enthalpy due to change in temperature) to the experimental heat capacities of aqueous SO2 required special attention, leading to the derivation of a new equation for calculating this effect. Standard state values for the heat capacities and volumes of aqueous CO2, SO2, HCO3−, and HSO3− were obtained from the apparent molar properties by extrapolation to infinite dilution. Combining these results with other thermodynamic data from the literature gave estimates of log K1b the equilibrium constant for the first neutralization of CO2 and SO2, at high temperatures. The results for CO2 reproduce very accurate literature values to within 0.2 at 200 °C. The expression for the reaction [Formula: see text] log K1b = 22.771 + 2776.0/T–8.058 log T, is consistent with the sparse and limited experimental data.

Measurement of the relaxation frequency of the asymmetric stretching mode of carbon dioxide

1969 ◽  
Vol 35 (1) ◽  
pp. 171-183 ◽  
Author(s):  
J. P. Hodgson ◽  
R. J. Hine
Keyword(s):  
Carbon Dioxide ◽  
Shock Waves ◽  
Shock Tube ◽  
Vibrational Relaxation ◽  
Thermal Emission ◽  
Relaxation Frequency ◽  
Rate Of Change ◽  
Density Measurements ◽  
Bending Mode ◽  
Made In

The vibrational relaxation frequency of carbon dioxide has been determined by measuring the rate of change of thermal emission in shock waves near 4±3μ. This method of measuring the relaxation frequency depends mainly on the degree of excitation of the asymmetric stretching mode of the molecule, and the results are compared with those of earlier density measurements made in the same shock tube. The gas samples used are not optically thin, and it is shown that self-absorption can be taken into account. The results imply that the relaxation frequency of the asymmetric stretching mode is about 70% of that of the bending mode.

Solubility and density measurements of palmitic acid in supercritical carbon dioxide+alcohol mixtures

2010 ◽  
Vol 289 (1) ◽  
pp. 72-79 ◽  
Author(s):  
Lars Brandt ◽  
Octavio Elizalde-Solis ◽  
Luis A. Galicia-Luna ◽  
Jürgen Gmehling
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Palmitic Acid ◽  
Density Measurements ◽  
Alcohol Mixtures ◽  
Supercritical Carbon

Compressed liquid density measurements of dimethyl ether with a vibrating tube densimeter

2011 ◽  
Vol 43 (9) ◽  
pp. 1371-1374 ◽  
Author(s):  
Jianguo Yin ◽  
Jiangtao Wu ◽  
Xianyang Meng ◽  
Ilmutdin Abdulagatov
Keyword(s):  
Dimethyl Ether ◽  
Liquid Density ◽  
Density Measurements ◽  
Compressed Liquid ◽  
Vibrating Tube Densimeter
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