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Stability of a Benzyl Amine Based CO 2 CaptureAdsorbent in View of Regeneration Strategies

View Article: PubMed Central - PubMed

ABSTRACT

Inthis work, the chemical and thermal stability of a primary amine-functionalizedion-exchange resin (Lewatit VP OC 1065) is studied in view of thepotential options of regenerating this sorbent in a CO2 removal application. The adsorbent was treated continuously in thepresence of air, different O2/CO2/N2 mixtures, concentrated CO2, and steam, and then the remainingCO2 adsorption capacity was measured. Elemental analysis,BET/BJH analysis, Fourier transform infrared spectroscopy, and thermogravimetricanalysis were applied to characterize adsorbent properties. This materialwas found to be thermally and hydrothermally stable at high temperatures.However, significant oxidative degradation occurred already at moderatetemperatures (above 70 °C). Temperatures above 120 °C leadto degradation in concentrated dry CO2. Adding moistureto the concentrated CO2 stream improves the CO2-induced stability. Adsorbent regeneration with nitrogen strippingis studied with various parameters, focusing on minimizing the molesof purge gas required per mole of CO2 desorbed.

No MeSH data available.


Effectof the flow on nitrogen required vs fractional CO2 desorbedat 100 °C in the range of 0.50–2.50 L min–1.
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fig9: Effectof the flow on nitrogen required vs fractional CO2 desorbedat 100 °C in the range of 0.50–2.50 L min–1.

Mentions: In this equation, n (mol) represents the totalamount of CO2 that can be desorbed, while a and ta (s) represent the fraction ofCO2 actually desorbed and the time required to reach thatfraction. The fractional CO2 desorbed is defined by theratio of CO2 desorbed at time ta (s) to the maximum total amount of CO2 desorbed duringthe regeneration. Symbols ϕN2 (L/s) and Vm (L/mol) represent flow of the nitrogen andthe standard volume of 1 mol of gas at the desorption temperature. Figure 9 shows the relationbetween the fractional CO2 desorbed and the value of F. From this figure, it is clear that regeneration of thesorbent beyond 95% requires enormous amounts of purge gas. Furthermore,when the fractional CO2 desorbed is less than 90%, thereis a decrease in the value of factor F as the flowis decreased. Although the regeneration time is maximal under 0.50L min–1, it consumes the least amount of nitrogento regenerate the same amount of CO2 in the first 90% regeneration.


Stability of a Benzyl Amine Based CO 2 CaptureAdsorbent in View of Regeneration Strategies
Effectof the flow on nitrogen required vs fractional CO2 desorbedat 100 °C in the range of 0.50–2.50 L min–1.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5384483&req=5

fig9: Effectof the flow on nitrogen required vs fractional CO2 desorbedat 100 °C in the range of 0.50–2.50 L min–1.
Mentions: In this equation, n (mol) represents the totalamount of CO2 that can be desorbed, while a and ta (s) represent the fraction ofCO2 actually desorbed and the time required to reach thatfraction. The fractional CO2 desorbed is defined by theratio of CO2 desorbed at time ta (s) to the maximum total amount of CO2 desorbed duringthe regeneration. Symbols ϕN2 (L/s) and Vm (L/mol) represent flow of the nitrogen andthe standard volume of 1 mol of gas at the desorption temperature. Figure 9 shows the relationbetween the fractional CO2 desorbed and the value of F. From this figure, it is clear that regeneration of thesorbent beyond 95% requires enormous amounts of purge gas. Furthermore,when the fractional CO2 desorbed is less than 90%, thereis a decrease in the value of factor F as the flowis decreased. Although the regeneration time is maximal under 0.50L min–1, it consumes the least amount of nitrogento regenerate the same amount of CO2 in the first 90% regeneration.

View Article: PubMed Central - PubMed

ABSTRACT

Inthis work, the chemical and thermal stability of a primary amine-functionalizedion-exchange resin (Lewatit VP OC 1065) is studied in view of thepotential options of regenerating this sorbent in a CO2 removal application. The adsorbent was treated continuously in thepresence of air, different O2/CO2/N2 mixtures, concentrated CO2, and steam, and then the remainingCO2 adsorption capacity was measured. Elemental analysis,BET/BJH analysis, Fourier transform infrared spectroscopy, and thermogravimetricanalysis were applied to characterize adsorbent properties. This materialwas found to be thermally and hydrothermally stable at high temperatures.However, significant oxidative degradation occurred already at moderatetemperatures (above 70 °C). Temperatures above 120 °C leadto degradation in concentrated dry CO2. Adding moistureto the concentrated CO2 stream improves the CO2-induced stability. Adsorbent regeneration with nitrogen strippingis studied with various parameters, focusing on minimizing the molesof purge gas required per mole of CO2 desorbed.

No MeSH data available.