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Degradation of ROC16, a Novel Amine Solvent. Stephanie Freeman January 10 th , 2007. Rochelle Group University of Texas at Austin – Dept. of Chemical Engineering. Presentation Outline . Introduction to ROC16 CO 2 Solubility Solid-Liquid Equilibrium of ROC16 Volatility of ROC16

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stephanie freeman january 10 th 2007

Degradation of ROC16, a Novel Amine Solvent

Stephanie Freeman

January 10th, 2007

Rochelle Group

University of Texas at Austin – Dept. of Chemical Engineering

presentation outline
Presentation Outline
  • Introduction to ROC16
    • CO2 Solubility
    • Solid-Liquid Equilibrium of ROC16
    • Volatility of ROC16
    • Capacity and Viscosity
    • Comparison of Kinetics
  • Oxidative Degradation with Metals
  • Thermal Degradation
  • Conclusions and Current Issues
  • Future Work on ROC16
introduction to roc16
Introduction to ROC16
  • ROC16 is a novel amine solvent recently patented by the Rochelle Group
  • The Rochelle group is currently investigating ROC16 as an viable alternative to 7 m MEA
solubility of roc20

Hilliard (2007)

Solubility of ROC20

At a loading of ~0.22, ROC20 is soluble at ambient temperature

solubility of roc16 cont

Hilliard (2007)

Solubility of ROC16 (cont.)

Current optimized absorber loadings

kinetics roc16 vs 7 m mea
Kinetics: ROC16 vs. 7 m MEA
  • Comparison at 60°C, PCO2* = 1 kPa
  • kg’ = 1.5x10-9 kmol/m2-Pa-s, 7.0 m MEA(a)
  • kg’ = 2.7x10-9 kmol/m2-Pa-s, ROC04 (b)
  • kg’ for ROC16 was estimated
  • Aboudheir (2003)
  • Cullinane (2005)

Rate of ROC16 is roughly 2X faster than 7 m MEA

oxidative degradation methods
Oxidative Degradation - Methods
  • Low gas flow experiments
    • 100 mL/min 98% O2 / 2% CO2
  • Analysis using Anion and Cation IC to detect:
    • Organic acids (formate, acetate, etc.)
    • Inorganic ions (nitrite and nitrate)
    • Amides (through formate production)
    • Amines
  • Not yet testing for:
    • Amino Acids
    • Aldehydes
thermal degradation methods
Thermal Degradation - Methods
  • Degradation of ROC20 studied at 135°C and 150°C
    • Loadings of α=0.3 and α=0.4
  • Stainless steel bombs used
  • Amine concentration analyzed by:
    • Cation IC
    • Acid pH titration
conclusions
Conclusions

Advantages of ROC16 over MEA

  • Faster rates of absorption (Cullinane 2005)
  • Higher capacity for CO2:
    • CapROC16 = 1.44 mol CO2 / kg solution
    • CapMEA = 0.84 mol CO2 / kg solution
  • Negligible oxidative degradation (w/o Cu2+)
  • Negligible thermal degradation (potentially greater stripper P and T)
  • Comparable heat of absorption
  • Comparable volatilities
conclusions cont
Conclusions (cont.)

Issues that Need to be Addressed

  • Increased viscosity decreases diffusion
  • Precipitation with loss of CO2 loading or over-loading
  • Feasibility of onsite loading of ROC16
  • Narrow solubility range
  • Volatility management
conclusions cont1
Conclusions (cont.)

Potentially Intractable Obstacles

  • Pseudo-polymerization of ROC16
    • Rapid increase in viscosity
    • Trigger unknown
  • Anomalous gas/liquid behavior
    • Oxidation experiments with either Fe/Cr/Ni or Cu produced some kind of “foam”
future work on roc16
Future Work on ROC16
  • Additional degradation experiments with higher concentrations of Cr, Ni, and Fe
  • Obtain rate data for ROC16
  • Further study phase equilibrium behavior of ROC16
  • Investigate pseudo-polymerization
  • Develop plausible onsite loading procedures
  • Determine true extent of foaming
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