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Title: Hydrophobic Polymeric Solvents for the Selective Absorption of CO2 from Warm Gas Streams that also Contain H2 and H2O

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 H2. 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 CO2 and H2 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 120 °C at pressures to 10 MPa. CO2 is much more soluble in each solvent than H{sub 2}; however, the solubility of CO{sub 2} decreases as the solubility of H2 increases with increasing temperature. PPGDMEl 678 and PPGDMEb 430 are comparable CO2 solvents. PPGDMEl 678 absorbs less H{sub 2} than all the other solvents, while PPGDMEb 430 absorbs significantly more H2}. PDMS 550 is a very good CO2 solvent, absorbing more CO2 than all of the other solvents at all temperatures except for PEGDME 250 at 25 °C. PDMS 550 absorbs more H2 than all of the other solvents.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [1] ;  [3] ;  [4]
  1. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States); Univ. of Pittsburgh, PA (United States). Dept. of Chemical and Petroleum Engineering
  2. Univ. of Pittsburgh, PA (United States). Dept. of Chemical and Petroleum Engineering
  3. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States)
  4. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
Publication Date:
OSTI Identifier:
1129863
Report Number(s):
A-UNIV-PUB--061
Journal ID: ISSN 0887-0624
DOE Contract Number:
FE0004000
Resource Type:
Journal Article
Resource Relation:
Journal Name: Energy and Fuels; Journal Volume: 27; Journal Issue: 11
Publisher:
American Chemical Society (ACS)
Research Org:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY