Showing papers in "Journal of Chemical & Engineering Data in 1980"

Solid solubilities of naphthalene and biphenyl in supercritical carbon dioxide

Abstract: Solld solubllltles of naphthalene and blphenyl In supercrltlcal carbon dioxide were measured at varlous Isotherms above 31.06 OC-the crltlcal temperature of C0,-and over a range of pressures from 80 to 500 atm. The upper crltlcal end polnt for the naphthalene-carbon dloxlde system Is estlmated from the solublllty data to be 63 OC, 240 atm, and a naphthalene mole fractlon of 0.16. The upper crltlcal end-polnt temperature for the blphenyl-carbon dloxlde system Is -56 OC and at a pressure near 460 atm. The biphenyl mole fractlon at the upper crltlcal end polnt (UCEP) Is -0.16.

Solubilities of phenol and chlorinated phenols in supercritical carbon dioxide

Abstract: The solubilities of phanol and chlorinated phenols in supercritical carbon dioxide were measured at 36/sup 0/C (and 60/sup 0/C for phenol) and 78-246 atm in an apparatus consisting of two in-series, high-pressure equilibrium cells, fitted to a heated metering valve and Bourdon-type Heiss pressure gage. Saturated solutions exiting the cells were determined by weighing, and carbon dioxide was determined with a wet-test meter. Standard deviations were generally < 5% and typically 1-2% of phenol mole fraction values. The two isotherms obtained for phenol showed distinctly different solubility behavior, owing to the fact that phenol is a solid at 36/sup 0/C but a liquid at 60/sup 0/C, and the solubilities measured are for phenol in the supercritical-fluid phase. Applications of dense-gas extraction in the regeneration of activated carbon are discussed.

Gas-liquid equilibrium in hydrogen + n-hexadecane and methane + n-hexadecane at elevated temperatures and pressures

Abstract: This investigation presents experimental results for gas-liquid phase equilibria in binary mixtures of n-Hexadecane with hydrogen at four temperatures from 374/sup 0/ to 736/sup 0/F (190/sup 0/ to 391/sup 0/C) and with methane from 374/sup 0/ to 806/sup 0/F (190/sup 0/ to 430/sup 0/C). At each temperature, measurements were made at pressures from 20 atm up to either 250 atm or near the critical pressures of the mixtures.

Diffusivities of mono-, di-, and triethanolamines in aqueous solutions

Abstract: Aqueous solutions of ethanolamines, such as MEA (monoethanolamine), DEA (diethanolamine), or TEA (triethanolamine), are frequently used for the removal of acidic gases. Therefore, a knowledge of the diffusivities of these ethanolamines in the aqueous solutions of various concentrations is important in the rational design of absorption equipment. Thomas and Furzer (6) have measured the diffusivities of MEA, DEA, and TEA in aqueous solutions by the Gouy method up to high concentrations and found that the diffusivities of MEA and TEA follow the Stokes-Einstein relation; Le., the product Dp is constant at constant temperature, whereas the d i f f us i i of DEA shows large deviation from the Stokes-Einstein relation. They have explained that this large deviation is due to the increase in molecular weight of DEA in the solution through association and hydration. However, on the basis of the experimental results that all of the three ethanolamines are molecularly associated in aqueous solution, Ibrahim and Kuloor (2) have pointed out that the anomalous behavior in the case of DEA cannot be solely attributed to association. In this paper, new data for the diffusivities of MEA, DEA, and TEA in aqueous solutions are reported and compared with the data of Thomas and Furzer (6) and with the Stokes-Einstein relation.

Thermal conductivity of aqueous sodium chloride solutions from 20 to 330.degree.C

Abstract: Selected thermal conductivity data reported in the literature for aqueous sodium chloride solutions are tabulated for geothermal energy applications. Experimental values were converted where necessary to a set of consistent units of degree Celsius, molal concentration and watts per meter Celsius. A selected empirical equation is given to reproduce the data over the temperature range 20 to 330/sup 0/C, concentrations between 0 and 5 m, and at saturation pressures. A table of smoothed values is generated by using the correlation which reproduces the experimental data to +- 2% up to 80/sup 0/C. Between 100 and 150/sup 0/C, the percent deviation is +17% to +31% for the one set of available experimental values. Recommendations for additional data needs are given. 2 figures, 3 tables.

Vapor pressure measurements of diphenylmethane, thianaphthene, and bicyclohexyl at elevated temperatures

Abstract: In this paper we present the values of vapor pressure at elevated temperature for diphenylmethane (424.64-648.25 K), thlanaphthene (424.40-630.60 K), and bicyclohexyl (424.25-577.25 K). A hlgh-temperature statlc apparatus has been used for the measurements. The experimental data of vapor pressures have been fltted to Chebyshev polynomials. The values of dp/d Tover the temperature ranges Investigated are reported.