Health & Environmental Research Online (HERO)


Print Feedback Export to File
7543603 
Journal Article 
Sterically Hindered Amines for CO2 Removal from Gases 
Sartorl, G; Savage, DW 
1983 
0 
Industrial and Engineering Chemistry Fundamentals
ISSN: 0196-4313 
AMER CHEMICAL SOC 
WASHINGTON 
22 
2 
239-249 
English 
WOS:A1983QM07300016 
Steric hindrance and basicity are shown to control CO2-amine reactions. In aqueous amino alcohols, steric hindrance is the dominant factor giving high thermodynamic capacity and fast absorption rates at high CO2 loadings. Introducing steric hindrance by a bulky substituent adjacent to the amino group lowers the stability of the carbamate formed by CO2-amine reaction. Reduced carbamate stability allows thermodynamic CO2 loadings to exceed those attainable with conventional, stable-carbamate amines. Lowering carbamate stability also leads to high free-amine concentration in solution; therefore fast amine-CO2 reaction rates are obtained despite some reduction of the rate constant owing to steric interference. Hindered amines show capacity and absorption rate advantages over conventional amines for CO2 removal from gases by absorption in aqueous amine solutions and amine-promoted hot potassium carbonate. Cyclic capacity broadening of 20-40% and absorption rate increases up to 100% or more are possible with certain hindered amines. © 1983, American Chemical Society. All rights reserved. 
CHEMICAL REACTIONS; THERMODYNAMICS; AMINES; CARBAMATE; STERIC HINDRANCE; CARBON DIOXIDE 
Other
• Harmful Algal Blooms- Health Effects
     April 2021 Literature Search
          Scopus