Sukanta Kumar Dash

Carbon Dioxide Capture: Absorption of Carbon Dioxide in Piperazine Activated Concentrated Aqueous 2-Amino-2-Methyl-1-Propanol

Abstrac t—In this work new experimental data on the rate of absorption of CO2 into PZ activated concentrated aqueous AMP in the temperature range of (323–333) K are presented. Rate activator PZ is used with a concentration of (2–8) wt%, keeping the total amine concentration in the solution at 50 wt%. The vapour-liquid equilibrium (VLE) of CO2 into aque ous solutions of (AMP+PZ) have also been measured and modeled in order to determine the liquid phase speciation of (AMP+PZ+CO2+H2O) s ystem and equilibrium CO2 loading. Th e theoretical absorption-rate model used to interpret the experimental kinetic data is based on all possible chemical reactions in the liquid phase. The average absolute deviation between the experimental and model results is about 6.8 %. Index Terms—CO2 capture, 2-Amino-2-methyl-1-propanol,

Post-Combustion CO2 Capture with Sulfolane Based Activated Alkanolamine Solvent

Abstract In this work, new experimental data on vapour-liquid equilibrium (VLE) of CO 2 in piperazine (PZ) activated aqueous solutions of n-methyldiethylamine (MDEA) and hybrid solvents containing sulfolane as physical solvent along with aqueous (MDEA+PZ) have been reported over the temperature range of (313-333) K and CO 2 partial pressure range of (1-1400) kPa. PZ is used as a rate activator with a concentration range of 2 to 8 mass% and the total amine concentration in the aqueous solution of (MDEA+PZ) has been kept within 50 mass%, while the concentration of physical solvent sulfolane has been maintained at 10 mass%. Electrolyte non random two-liquid (ENRTL) theory has been used to model the VLE. A simulation work has been carried out using Aspen Plus (V7.1) to evaluate the energy requirements on % CO 2 removal. The hybrid solvent showed higher % CO 2 removal when compared with those of PZ-activated aqueous MDEA.

Post-combustion Carbon Dioxide Capture with Aqueous (Piperazine + 2-Amino-2-Methyl-1-Propanol) Blended Solvent: Performance Evaluation and Analysis of Energy Requirements

Post-combustion CO2 capture (PCC) and its sequestration has been found to be a viable option for reducing CO2 in the earth’s atmosphere. There are many technological options for separation of CO2 from a post combustion gas stream. However, regenerative chemical absorption process is considered to be a near-term feasible solution for this. In regenerative chemical absorption, the key component is the solvent, which plays a major role in the process efficiency and economics. There are many conventional and newer commercial solvents with patented technologies available for this process. In this chapter, the suitability of aqueous AMP along with PZ as an energy efficient mixed solvent for the PCC process have been presented by critically analyzing the absorption rate, equilibrium thermodynamics, reaction kinetics as well as regeneration energy requirement. Energy analysis from bench scale and pilot scale studies, and modelling and simulation work have been investigated and compared with the bench marked solvent MEA. The role of important solvent properties for this application, i.e., density, viscosity, physical gas solubility, reaction mechanism and kinetics, equilibrium solubility and heat of absorption are found to be suitable for the CO2 capture by AMP + PZ solvent. Besides, it is also found that the negative impact such as, corrosion, thermal and oxidative degradation, possible amine and nitrosamine emission from the capture plant have less impact to the environment. Heat energy requirements of this process are found to be in the range of 2.9–3.7 GJ/tCO2 for different conditions such as, %CO2 capture, etc., and from different study. This energy requirement is about 20% less than that of the bench marked MEA solvent. All this performance indicators show that the AMP + PZ blended solvent is a competitive energy efficient alternative one for CO2 capture by chemical absorption.

Post combustion carbon dioxide capture using amine functionalized carbon nanotubes: A review

Many technological viable options available for post combustion CO2 capture (PCC) from fossil fuel based power plants, such as amine absorption, adsorption, membrane separation, cryogenic separation processes. Out of these technological pathways adsorption using carbon nanotubes (CNTs) has shown potential advantages compared to other techniques for CO2 capture from flue gas streams which is evident form published literature from various research groups. Considering the recent developments, this work presents a state-of-the-art review on CO2 capture process using CNTs, amine functionalized CNTs and membrane based CNTs. One of the major challenges in developing CNT adsorption technology lies in the choice and development of an adsorbent material that can efficiently adsorb and also easily desorb and concentrate the captured CO2 with low energy input. This review work consists of a number of interdisciplinary research activities that are focused on the feasibility of developing a small scale carbon capture a...

CO2 Capture Using an Aqueous Formulated Solvent Containing Ethylaminoethanol, N- Methyl-2- Pyrolidone, and Hydroxyl Radical Scavengers: Study of Solvent Degradation and Absorption Kinetics

In this study, an aqueous formulated solvent (FS) containing renewably prepared ethylaminoethanol (EAE), N-methyl-2-pyrollidone (NMP), and K2CO2/KHCO3 was prepared for CO2 capture. Oxidative degradation of FS was studied at 423 K by employing an accelerated degradation reaction approach. The physico-chemical properties such as density and viscosity of FS and diffusivity and solubility of CO2 in FS were estimated experimentally. Furthermore, kinetics of reactive absorption of CO2 in FS was investigated by using a stirred cell reactor following a fall in pressure technique.