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Determination of Amine Volatility for CO 2 Capture

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Determination of Amine Volatility for CO 2 Capture. Thu Nguyen January 10, 2008 The University of Texas at Austin Professor Gary Rochelle. Outline Scope of Present Work – determine MDEA and PZ volatility Experimental Apparatus – introduce FTIR setup & operation

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Presentation Transcript
slide1
Determination of Amine Volatility for CO2 Capture

Thu Nguyen

January 10, 2008

The University of Texas at Austin

Professor Gary Rochelle

slide2
Outline

Scope of Present Work – determine MDEA and PZ volatility

Experimental Apparatus – introduce FTIR setup & operation

Theory – use Raoult’s Law to measure volatility: partial pressure & activity coefficient)

Results – explore volatility in terms of loading, temperature, & amine concentration

Future Work -- outline of activities planned

slide3
Scope of Present Work
  • Determine PZ and MDEA volatility in blends of varying amine concentrations
  • Explore volatility in terms of Partial Pressure and Activity Coefficient
  • Ask how do these parameters behave with
  • i. CO2 loading
  • ii. Temperature
  • iii. Varying amine concentration
  • 3) Run experiments at 40ºC and 60ºC
slide5
-apparatus allows simultaneous measurements of CO2 solubility and amine volatility

-sample line & FTIR are both kept at elevated operating temperature (180ºC) to eliminate condensation / adsorption of vapor amine to surface

-FTIR is capable of performing multi-component analysis

-gas is returned back to reactor at ~55ºC higher than reactor temp. to avoid rapid condensation / loss of amine species

slide6
Theory

-activity coefficient is calculated using modified Raoult’s law

yi P =γi * xi * Po

yi : vapor phase mole fraction of species i (FTIR)

P : total pressure at equilibrium (reactor pressure)

γi : activity coefficient of species i (to be determined)

xi : liquid phase mole fraction of species i (Amine Titration)

Po: vapor pressure of species i (DIPPR database)

slide7
Vapor Pressure Equation (DIPPR Thermodynamic Database)

Pvap (Pa) = exp [A + B/T + C(ln T) + DTE] where T is in Kelvin

Pvap = exp [70.5 -7914/T – 6.65(ln T) + 5.21e-18(T)6 for PZ

Pvap = exp [253.1 -18378/T – 34(ln T) + 2.34e-5(T)2 for MDEA

model confirmed to provide good consistent estimates of vapor pressures within 283K – 785K range (includes experimental temperatures)

slide12
Conclusions

PZ Partial Pressure

~2.2-19.3 ppm (40ºC) 15-66 ppm (60ºC)

MDEA Partial Pressure

~5.2-6.9 ppm (40ºC) 24.8-28.6 ppm (60ºC)

slide13
Future Work

-Continue amine volatility measurements for:

-other blends of varying amine concentrations -focus on volatility in absorber lean & wash water stream -focus on volatility at stripper unit -ROC16 solution

-Modeling experimental results to obtain activity coefficient prediction models

-NMR Analysis

-Heat Capacity Measurements

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