Entity

Time filter

Source Type

Provo, UT, United States

Mathias P.M.,Fluor Corporation | Jasperson L.V.,Wiltec Research Company | Vonniederhausern D.,Wiltec Research Company | Bearden M.D.,Pacific Northwest National Laboratory | And 3 more authors.
Industrial and Engineering Chemistry Research | Year: 2013

Anhydrous tertiary alkanolamines chemically react with CO2 and H2S, with greater selectivity for the latter. This is in direct contrast to aqueous amine-based solvent systems, which exhibit higher selectivity for CO2 over H2S. Anhydrous tertiary alkanolamines exhibit pressure-induced chemical fixation of CO2 to form zwitterionic ammonium alkylcarbonate ionic liquids, while the same tertiary alkanolamines react with H2S at atmospheric pressures to form hydrosulfide ionic liquids. This difference in capture pressure implies that certain anhydrous alkanolamines could be chemically selective for H2S over CO2. We present here the first published vapor-liquid-liquid equilibrium (VLLE) data of anhydrous ethyldiethanolamine (EDEA) with CH 4, C3H8, H2S, and CO2 at 10-50 C measured by the TPx and TPxy methods. The data are modeled in Aspen Plus using an NRTL-with-solvation model. Data trends and the underlying phenomena are discussed for each gas. We also present process simulations that compare anhydrous EDEA's performance for CO2 and H2S high-pressure separations to other solvents such as Fluor Solvent (propylene carbonate), Selexol, and aqueous methyldiethanolamine (MDEA) for a representative gas-purification absorber. This work indicates that a niche for anhydrous EDEA in high-pressure gas purifications may be its stronger absorption for CO 2 and H2S (relative to physical solvents) and its selectivity for H2S over CO2 (relative to chemical solvents). © 2013 American Chemical Society. Source


Wilson L.C.,Wiltec Research Company | Wilson L.C.,Royal Dutch Shell | Wilding W.V.,Wiltec Research Company | Wilding W.V.,Brigham Young University | Wilson G.M.,Wiltec Research Company
Journal of Chemical and Engineering Data | Year: 2014

Pressure-volume-temperature (PVT) data on hydrogen fluoride (HF) were measured from (293 to 473) K and from low pressure to near saturation pressure. These data were compared to existing literature data, and a model was developed which accurately represents the association behavior of pure, gaseous hydrogen fluoride. This model includes the assumption of HF dimers and hexamers in equilibrium with monomeric HF. The vapor pressure of hydrogen fluoride was also measured from (293 to 454) K, and these measurements were correlated using the Riedel equation. There is good agreement between these vapor pressures and previous work, while this work extends the measured vapor pressure for HF to within 7 K of the critical temperature. © 2013 American Chemical Society. Source


Heldebrant D.J.,Pacific Northwest National Laboratory | Mathias P.M.,Fluor Corporation | Afshar K.,Fluor Corporation | Reddy S.,Fluor Corporation | And 6 more authors.
AIChE 2012 - 2012 AIChE Annual Meeting, Conference Proceedings | Year: 2012

Anhydrous tertiary alkanolamines chemically react with CO2 and H2S, with greater selectivity for the latter. This is in direct contrast to aqueous amine-based solvent systems with higher selectivity for CO2 due to stronger chemical fixation than for H2S. Anhydrous tertiary alkanolamines exhibit pressure-induced chemical fixation of CO2 to form zwitterionic ammonium alkylcarbonate ionic liquids, while the same tertiary alkanolamines react with H2S at atmospheric pressures to form hydrosulfide ionic liquids. This difference in capture pressure implies that anhydrous alkanolamines could be chemically selective for H2S over CO2 under specific conditions. We present here the first vapor-liquid equilibrium (VLE) data of anhydrous ethyldiethanolamine (EDEA) with CH4, C3H8, H2S and CO2 at 10 and 50 °C measured by the PTx and PTxy methods. The data are modeled in Aspen Plus® using an electrolyte NRTL model. Data trends and phenomena are discussed for each gas. We also compare anhydrous EDEA's simulated performance for CO2 and H2S separations to other solvents such as Fluor Solvent, Econosolv, and aqueous methyldiethanolamine (MDEA) for representative gas-processing applications. Source


McDougal R.J.,Wiltec Research Company | Jasperson L.V.,Wiltec Research Company | Wilson G.M.,Wiltec Research Company
Journal of Chemical and Engineering Data | Year: 2014

Vapor-liquid equilibrium (VLE) measurements have been performed on several binary systems incorporating chemicals of interest to the biofuels industry. Systems were chosen based on two criteria: (1) similarity to measurement requests received by Wiltec and (2) suitability of using the Wilson Equation to model the activity coefficients for the VLE data. The Wilson Equation is a good choice for modeling fully miscible solutions of moderately polar compounds. With these two ideas in mind, systems were chosen incorporating the following compounds: 1-methoxy-2-propanol, 2-furaldehyde, allyl alcohol, butyl acetate, carbon dioxide, carbon disulfide, carbonyl sulfide, ethanolamine, ethyl acetate, n-butanol, pentane, and tert-butanol. Measurement temperatures ranged from -25 °C to +200 °C. © 2014 American Chemical Society. Source

Discover hidden collaborations