Figure 1.1 Phase behavior of supercritical CO2 and H2O
Figure 1.2 Viscosity of CO2 as a function of temperature and pressure
Figure 1.3 CO2 flooding in a typical reservoir: (a) “fingering” phenomena without mobility control, (b) CO2 flows with thickeners
Figure 1.4 Viscosity of PFOA in CO2 at 323K under different concentrations
Figure 1.5 CO2 solubility of PHFDA-xPSt copolymers at 298K
Figure 1.6 CO2 viscosity enhancement achieved with the fluoroacrylate-styrene copolymers
Figure 1.7 π-π stacking of the aromatic phenyl groups, (a) an overview structure; (b) a close view structure
Figure 1.8 Effect of shear rate and concentration on the viscosity of fluoroacrylate-styrene copolymer solution in CO2; Glass tube inside radius=1.588 cm; copolymer of 29mol% Styrene-71mol% fluoroacrylate; T=298K; P=34 MPa
Figure 2.1 Comparison of the partial charges on the individual atoms of H2O (A) and CO2 (B) with the charges derived by fitting the electrostatic potentials (CHELPG charges) in electrons calculated at the MP2/aug-cc-pVDZ level.109
Figure 2.2 Schematic diagram of interactions between CO2 and CO2-philic group, (a) CO2 as a Lewis acid (C=O(((C); (b) CO2 acts as a Lewis base (C(H(((O)
Figure 2.3 Cloud point pressures at ~5% polymer concentration and 298 K for binary mixtures of CO2 with polymers as a function of number of repeat units based on Mw, where PFA, PDMS, PVAc, PLA, PMA and PACD represent poly(fluoroalkyl acrylate), poly(dimethyl siloxane), poly(vinyl acetate), poly(lactic acid), poly(methyl acrylate) and per-acetylated cyclodextrin, respectively.119,123
Figure 2.4 Schematic of experimental apparatus for phase behavior study with a high pressure, variable volume, windowed cell (D.B. Robinson Cell)
Figure 2.5 Detailed drawing of a high pressure, windowed, stirred, variable-volume view cell
Figure 2.6 Schematic diagram for a falling cylinder viscometer
Figure 3.1 Structure of poly(3-acetoxy oxetane), PAO
Figure 3.2 Three dimensional view of methoxy-isopropyl acetate, MIA
Figure 3.3 Three multiple binding geometry of CO2 with methoxy isopropyl acetate
Figure 3.4 Synthesis scheme for monomer 3-acetoxyoxetane140,141
Figure 3.5 Synthesis scheme for poly(3-acetoxy oxetane) (PAO, Polymerization II)
Figure 3.6 Synthesis scheme for poly(3-acetoxy oxetane) (PAO, Polymerization II)
Figure 3.7 Pressure-composition diagram for CO2 + poly(3-acetoxy oxetane) system at 298 K
Figure 3.8 Structure of poly(vinyl methoxymethyl ether) (PVMME)
Figure 3.9 Optimized binding geometry of CO2 with acetal group
Figure 3.10 Synthesis scheme for poly(vinyl methoxymethyl ether) and poly(vinyl 1-methoxyethyl ether)
Figure 3.11 Pressure-composition diagram for CO2 + poly(vinyl ether) systems at 298 K
Figure 4.1 Pressure-composition phase diagram for the CO2+AGLU/BGLU/BGAL at 313K 112
Figure 4.2 Pivaloylysis of cellulose triacetate 152
Figure 4.3 Composition tracking of every CTA oligomer during pivaloylysis152
Figure 4.4 Pressure-composition diagram for CO2 + CTA oligomer system at 298 K
Figure 4.5 General pressure-composition (P-x) phase diagram for classic sub/supercritical CO2 + heavy solid system 7
Figure 4.6 General pressure-composition (P-x) phase diagram for the novel sub/supercritical CO2 + heavy solid system 113
Figure 4.7 General pressure-composition (P-x) phase diagram for the novel sub/supercritical CO2 + heavy solid system 113
Figure 5.1 Structure of β-D-maltose octaacetate
Figure 5.2 Pressure-composition diagram for the carbon dioxide (1) + maltose octaacetate (2) system at 283 K
Figure 5.3 Pressure-composition diagram for the carbon dioxide (1) + maltose octaacetate (2) system at 298 K
Figure 5.4 Pressure-composition diagram for the carbon dioxide (1) + maltose octaacetate (2) system at 323 K
Figure 5.5 P-T Projection for the carbon dioxide (1) + maltose octaacetate (2) system. Solid lines represent pure-component saturation curves, dashed lines represent critical curves, and dotted-dashed lines represent three-phase lines. is the triple point and is the critical point of CO2; is the triple point and is the critical point of MOA.
Figure 5.6 General pressure-composition (P-x) phase diagram for CO2 and solid CO2-philic compounds or polymers
Figure 5.7 Pressure-composition phase diagram for CO2 + TFE-VAc copolymer system at 25 °C
Figure 5.8 Cloud-point curve for ~5 wt% CO2 + TFE46.7-co-VAc system 170
Figure 5.9 Quadradentate binding configuration for CO2 + TFE-VAc dyad using MP2/6-31+g(d) level of theory
Figure 5.10 Structure of poly(propylene glycol) monobutyl ethers
Figure 5.11 The comparison of the cloud point pressures with the published data 121
Figure 5.12 Pressure-composition isotherm at 298 K for binary mixture of carbon dioxide with Poly(propylene glycol) monobutyl ethers
Figure 5.13 The comparison of the phase behavior of PPGMBE with the PPGMBE surfactants 100
Figure 5.14 Structures of 1,3,5-tri-tert-butylbenzene, 2,4,6-tri-tert-butylphenol, and n-octadecane
Figure 5.15 Phase behaviors of n-octadecane 180 and 1,3,5-tri-tert-butylbenzene in CO2
Figure 5.16 Pressure –composition diagram for CO2 +TTBP system at 301K, (a) a overall view, (b) a close view for low concentration
Figure 5.17 Pressure –composition diagram for CO2 +TTBP system at 328K
Figure 5.18 Pressure –composition diagram for CO2 +TTBP system at 343K
Figure 5.19 P-T diagram for CO2+TTBP system; C1 and C2 represent critical points of CO2 and TTBP, respectively; M is melting point of TTBP; AC1 is CO2 vapor pressure curve; MN and DM are TTBP melting curve and sublimation curve, respectively; BM is three-phase solid-liquid-vapor line; C1C2 is the mixture critical curve.
Figure 6.1 Structure of (-D-galactose pentaacetate
Figure 6.2 Relative viscosity of (-D-galactose pentaacetate solution in CO2 at 313 K and 17.24 MPa
Figure 7.1 Upgraded Figure 2.3
Figure 8.1 Structure of a new poly(vinyl ether) for future work
Figure 8.2 Structure of poly(1-O-(vinyloxy)ethyl-2,3,4,6-tetra-O-acetyl-(-D-glucopyranoside) (poly(AcGlcVE)
Figure A. 1 1H NMR (300 MHz, CDCl3) spectrum of 3-acetoxy oxetane
Figure A. 2 1H NMR (300 MHz, CDCl3) spectrum of poly(3-acetoxy oxetane) (polymerization I)
Figure A. 3 MALDI spectrum of poly(3-acetoxy oxetane) (polymerization I)
Figure A. 4 1H NMR (300 MHz, CDCl3) spectrum of poly(3-acetoxy oxetane) (polymerization II)
Figure A. 5 MALDI spectrum of poly(3-acetoxy oxetane) (polymerization II)
Figure A. 6 1H NMR (300 MHz, CDCl3) spectrum of 1-chloroethyl methyl ether
Figure A. 7 1H NMR (300 MHz, DMSO-d6) spectrum of poly(vinyl ether)
Figure A. 8 1H NMR (300 MHz, DMSO-d6) spectrum of poly(vinyl methoxy methyl ether)
Figure A. 9 1H NMR (300 MHz, DMSO-d6) spectrum of poly(vinyl 1-methoxyethyl ether)
Figure A. 10 IR spectra of PVA, PVMME, and PVMEE
Figure A. 11 DSC for poly(vinyl alcohol)
Figure A. 12 DSC for poly(vinyl methoxymethyl ether)
Figure A. 13 DSC for poly(vinyl 1-methoxyethyl ether)
Figure A. 14 1H NMR (300 MHz, CDCl3) spectrum of acetylated cellulose acetate
Figure A. 15 MALDI spectrum of pivaloylysis products of CTA after 24 hours
Figure A. 16 Mass spectrum of CTA monomer by ESI
Figure A. 17 Mass spectrum of CTA dimer by ESI
Figure A. 18 Mass spectrum of CTA trimer by ESI
Figure A. 19 Mass spectrum of CTA tetramer by ESI