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Start Over Author "Das, Asit" Journal energy & fuels
14 results on '"Das, Asit"'

5. Simultaneous Determination of Boiling Range Distribution of Hydrocarbon, Sulfur, and Nitrogen in Petroleum Crude Oil by Gas Chromatography with Flame Ionization and Chemiluminescence Detections

Author

Chakravarthy, Ramachandra, primary, Naik, Ganesh N., additional, Savalia, Anilkumar, additional, Kedia, Jagdish, additional, Saravanan, Chandra, additional, Das, Asit Kumar, additional, Sreedharan, Unnikrishnan, additional, and Gudasi, Kalagouda B., additional

Published
2017
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11. Circulating Fluid-Bed Studies for CO2Capture from Flue Gas using K2CO3/Al2O3Adsorbent

Author

Sengupta, Surajit, Amte, Vinay, Das, Asit K, Yadav, Manoj, Mandal, Sukumar, Nerivetla, Sampath, and Bhunia, Haripada

Abstract

Recent research has concentrated on the adsorption-based CO2capture process with dry regenerable adsorbents that follows carbonate–bicarbonate chemistry in a thermal-swing mode. The potential advantages of solid adsorbents for CO2capture were assessed on a pilot scale. The performance of 35 wt % K2CO3supported on alumina was investigated in both batch (non-circulating) and continuous operation with adsorbent circulation mode. The effect of various parameters, such as adsorption and desorption temperatures, water vapor content in the flue gas stream, gas-hourly space velocity, mode of adsorbent regeneration, etc., were investigated in the system comprised of bubbling fluidized-bed adsorber and desorber. It has been found that the formation of hydrated species of K2CO3during the desorption process in turn facilitates the CO2adsorption reaction in the adsorber. The overall energy demand seems to be reduced during partial regeneration of the adsorbent, as against the requirement of 141 kJ/mol for full regeneration, and is thoroughly validated by DSC. It implies a reduced energy demand for adsorbent regeneration as compared to the conventional amine absorption process. The results showed more than 80% CO2removal using a simulated flue gas stream comprised of 8.3 vol % CO2, 15.8 vol % H2O, and the rest N2. The adsorbent displayed excellent structural stability even after 144 h of continuous operation with adsorbent circulation. The stability and lower energy demand for adsorbent regeneration in the continuous fluidized-bed reactor system at the pilot scale were very promising and encouraging for the economic viability of the capture process.

Published
2018
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