skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Thermally Stable Silicone Solvents for the Selective Absorption of CO2 from Warm Gas Streams That Also Contain H-2 and H2O

Authors:
; ; ; ;
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
Sponsoring Org.:
USDOE
OSTI Identifier:
1366444
Report Number(s):
A-UNIV-PUB-135
Journal ID: ISSN 0887-0624
Resource Type:
Journal Article
Resource Relation:
Journal Name: Energy and Fuels; Journal Volume: 30; Journal Issue: 7
Country of Publication:
United States
Language:
English

Citation Formats

Koronaios, P., Stevenson, C., Warman, S., Enick, R., and Luebke, D.. Thermally Stable Silicone Solvents for the Selective Absorption of CO2 from Warm Gas Streams That Also Contain H-2 and H2O. United States: N. p., 2016. Web. doi:10.1021/acs.energyfuels.6b00140.
Koronaios, P., Stevenson, C., Warman, S., Enick, R., & Luebke, D.. Thermally Stable Silicone Solvents for the Selective Absorption of CO2 from Warm Gas Streams That Also Contain H-2 and H2O. United States. doi:10.1021/acs.energyfuels.6b00140.
Koronaios, P., Stevenson, C., Warman, S., Enick, R., and Luebke, D.. 2016. "Thermally Stable Silicone Solvents for the Selective Absorption of CO2 from Warm Gas Streams That Also Contain H-2 and H2O". United States. doi:10.1021/acs.energyfuels.6b00140.
@article{osti_1366444,
title = {Thermally Stable Silicone Solvents for the Selective Absorption of CO2 from Warm Gas Streams That Also Contain H-2 and H2O},
author = {Koronaios, P. and Stevenson, C. and Warman, S. and Enick, R. and Luebke, D.},
abstractNote = {},
doi = {10.1021/acs.energyfuels.6b00140},
journal = {Energy and Fuels},
number = 7,
volume = 30,
place = {United States},
year = 2016,
month = 7
}
  • The hydrophobic polymers polydimethyl siloxane (PDMS) and polypropyleneglycol dimethylether (PPGDME) may provide an alternative to physical solvents based on the hydrophilic polymer polyethyleneglycol dimethylether (PEGDME) for the precombustion capture of CO{sub 2} from the warm, high pressure stream that also contains H{ 2O and H 2. PPGDME can be made with a linear repeat unit (PPGDMEl, poly(1,3-propanediol) dimethylether) or a branched repeat unit (PPGDMEb, poly(1,2-propanediol) dimethylether). The solubility of CO 2 and H 2 in each of the four solvents of specified average molecular weight (PEGDME 250, PDMS 550, PPGDMEl 678 and PPGDMEb 430) is determined between 25 and 120more » °C at pressures to 10 MPa. CO 2 is much more soluble in each solvent than H{sub 2}; however, the solubility of CO{sub 2} decreases as the solubility of H 2 increases with increasing temperature. PPGDMEl 678 and PPGDMEb 430 are comparable CO 2 solvents. PPGDMEl 678 absorbs less H{sub 2} than all the other solvents, while PPGDMEb 430 absorbs significantly more H 2}. PDMS 550 is a very good CO 2 solvent, absorbing more CO 2 than all of the other solvents at all temperatures except for PEGDME 250 at 25 °C. PDMS 550 absorbs more H 2 than all of the other solvents.« less
  • Three perfluorinated compounds (PFCs), PP10, PP11, and PP25, manufactured by F2 Chemicals Ltd., U.K., were investigated as physical solvents for selective CO{sub 2} capture from synthesis gas or syngas streams at elevated pressures and temperatures. The equilibrium solubility, the hydrodynamic, and the mass-transfer parameters of CO{sub 2} in the solvents were measured in a 4-L ZipperClave agitated reactor under wide ranges of operating conditions: pressures (6-30 bar), temperatures (300-500 K), mixing speeds (10-20 Hz), and liquid heights (0.14-0.22 m). The CO{sub 2} solubilities in the three solvents decreased with an increasing temperature at constant pressure and followed Henry's law. Themore » CO{sub 2} solubilities in PP25 were greater than those in PP10 and PP11. The volumetric liquid-side mass-transfer coefficients (k{sub La}) of CO{sub 2} in the PFCs increased with mixing speed, pressure, and temperature. Also, the gas-liquid interfacial areas of CO{sub 2} in the three PFCs appeared to control the behavior of k{sub La}. This study proved the thermal and chemical stability and the ability of the PFCs to selectively absorb CO{sub 2} at temperatures up to 500 K and pressures as high as 30 bar. A preliminary conceptual process design using PP25 for selective CO{sub 2} capture from hot-shifted gas with pressure-swing and pressure-temperature-swing regeneration options was devised. The pressure-temperature-swing option led to greater PP25 solvent loss but a more favorable (more negative) net enthalpy than the pressure-swing option. However, for either regeneration option to be economically viable, the PP25 solvent must be completely recovered from the process. 109 refs., 9 figs., 14 tabs.« less
  • Method and means are described for removal of oxides of nitrogen (NOx) from gas streams which also contain sulfur dioxide. Examples of such streams are stack gases from electrical generation plants which use fuels containing sulfur, such as some coals and fuel oils. The invention contemplates the absorption in water of the sulfur dioxide to form sulfurous acid, the addition of a multivalent metal such as iron to the resulting aqueous solution, and the reduction of the nitrogen in the oxides of nitrogen to elemental nitrogen as a consequence of reaction of the oxides of nitrogen with the metal-containing solution.