1 / 13

Determination of Amine Volatility for CO 2 Capture

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

ezra-daniel
Download Presentation

Determination of Amine Volatility for CO 2 Capture

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Determination of Amine Volatility for CO2 Capture Thu Nguyen January 10, 2008 The University of Texas at Austin Professor Gary Rochelle

  2. 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

  3. 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

  4. Experimental Apparatus – Stirred Reactor Coupled with FTIR Analysis

  5. -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

  6. 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)

  7. 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)

  8. Figure 1. PZ Volatility

  9. Figure 2. Apparent PZ Activity Coefficient

  10. Figure 3. MDEA Volatility

  11. Figure 4. MDEA Activity Coefficient

  12. 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)

  13. 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

More Related