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Saturday 18 February 2017
How to avoid Glycine losses in a GV dual activated solution for Carbondioxide absorption?
How to avoid Glycine losses in a GV dual activated solution for Carbondioxide absorption?
I am currently working on improving Efficiency for CO2 absorption
of a process plant. Dual activated GV solution (K2CO3+Glycine+DEA)
system is used for CO2 absorption. It is observerd that Glycine losses
are significant inspite of its low volatility and high stability towards
oxidation. What can be possible reason for Glycine loss and how can we
avoid it?
Dear Sundeep
The CO2 removal unit containing following percentage of Glycene,the
loss of Glycene can be control by maintaining temperature as per
attached flow digram, higher temp lead to loss of glycene. K2CO3 -27% GLYCENE- 1.2% DEA -1.0% VANADIUM- 0.4%
CHEMISTRY INVOLVED
ABSORBTION REACTION K2CO3+H20+CO2 =2 KHCO3
REGENERATION REACTION 2KHCO3 +HEAT = K2CO3 +H20+CO2 Please find attached herewith link & attached diagram. Good Luck ! Prem Baboo
Sundeep Pothula · Birla Institute of Technology and Science Pilani
Thanks a lot for your reply Sir,
But can I know
1. How is Glycine escaping at higher temperatures irrespective of its High Volatility (B.Pt around 230C)?
2.Is there any effect of Aeration on DEA & Glycine?
3. Does reflux in the system (Water or Condensate) effects the absorption process? (Increasing or decreasing the CO2 Slip)?
Dear Sundeep
Aeration cannot be done, for passivation V2O5 solution is used. You are saying right but How much partial pressure of GV in multi components system?
Addition of Vanadium as Corrosion Inhibitor, Static and Dynamic Passivation (0.5 % V2O5)
Iron content of the solution representation equilibrium (iron content more than 200-300ppm considered excessively high).
V+5 Protecting Layer( 5-10 % of total vanadium content).
V+5 equilibrium with V+4 V5+ + Fe2 = V4+ + Fe3+
Operating Parameters
Temperature - Hot aqueous solution to increase the rate of reaction.
- Keep the bicarbonate in the dissolved form. - Boiling point
temperature for Re generators.
Pressure - High pressure in absorber increase the solubility of
process gas in GV solution.solution. Reflux is not suitable for this
process generally distillation process in used or to separation process.
Amine Solution is the best option for capturing CO2 as shown in attached table
Please find attached herewith tables
Regards,
How to avoid Glycine losses in a GV dual activated solution for Carbondioxide absorption?
The CO2 removal unit containing following percentage of Glycene,the loss of Glycene can be control by maintaining temperature as per attached flow digram, higher temp lead to loss of glycene.
K2CO3 -27%
GLYCENE- 1.2%
DEA -1.0%
VANADIUM- 0.4%
CHEMISTRY INVOLVED
ABSORBTION REACTION
K2CO3+H20+CO2 =2 KHCO3
REGENERATION REACTION
2KHCO3 +HEAT = K2CO3 +H20+CO2
Please find attached herewith link & attached diagram.
Good Luck !
Prem Baboo
Technical Report: "Latest technique adopted in Ammonia Plant to improve Energy"
But can I know
1. How is Glycine escaping at higher temperatures irrespective of its High Volatility (B.Pt around 230C)?
2.Is there any effect of Aeration on DEA & Glycine?
3. Does reflux in the system (Water or Condensate) effects the absorption process? (Increasing or decreasing the CO2 Slip)?
Aeration cannot be done, for passivation V2O5 solution is used. You are saying right but How much partial pressure of GV in multi components system?
Addition of Vanadium as Corrosion Inhibitor, Static and Dynamic Passivation (0.5 % V2O5)
Iron content of the solution representation equilibrium (iron content more than 200-300ppm considered excessively high).
V+5 Protecting Layer( 5-10 % of total vanadium content).
V+5 equilibrium with V+4 V5+ + Fe2 = V4+ + Fe3+
Operating Parameters
Temperature - Hot aqueous solution to increase the rate of reaction. - Keep the bicarbonate in the dissolved form. - Boiling point temperature for Re generators.
Pressure - High pressure in absorber increase the solubility of process gas in GV solution.solution. Reflux is not suitable for this process generally distillation process in used or to separation process.
Amine Solution is the best option for capturing CO2 as shown in attached table
Please find attached herewith tables
Regards,