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Sterik Olarak Engelli Aminlerin Susuz Çözeltileriyle Karbon Dioksidin Reaksiyon Kinetikleri

Reaction Kinetics of Carbon Dioxide with Nonaqueous Solutions of Sterically Hindered Amines

Journal Name:

  • Journal of The Turkish Chemical Society, Section B: Chemical Engineering

Publication Year:

  • 2016

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
Due to existing energy intensive CO2 capture processes and rising fuel costs, alternative and affordable solvents or technologies for CO2 capture have gained importance in the research of reducing global warming. To that effect, sterically hindered amines have been introduced which have high CO2 absorption capacities by means of the formation of unstable carbamate ions. Another factor leading to an affordable solvent for CO2 capture could be using nonaqueous solvents instead of aqueous solvents in the process. This is important because nonaqueous solvents can eliminate some of the problems of aqueous solvents such as corrosion and high thermal requirements. To that end, in this study, we investigated the reaction kinetics of CO2 and two sterically hindered amines; 2-amino-2-methyl-1,3-propanediol (AMPD) and 2-amino-2-ethyl-1,3-propanediol (AEPD) in ethanol. The pseudo–first-order reaction rate constants of the reactions between CO2 and sterically hindered amines were measured in ethanol at 288, 298 and 308 K by using direct stopped-flow technique. The measured rate constants were then analyzed by using the equations of termolecular reaction mechanism. The orders of the reactions (n) between CO2-AMPD and CO2-AEPD were found as 1 and 2, respectively.
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Abstract (Original Language): 
Şu anda var olan CO2 tutuklama süreçleri ve artan yakıt maliyetlerinden ötürü, küresel ısınmayı azaltacak araştırmalarda CO2 tutuklama için ucuz çözücüler veya teknolojilerin kullanılması önem kazanmıştır. Bu anlamda, sterik olarak engelli aminler, kararsız karbamat iyonlarının oluşumu yoluyla yüksek CO2 soğurma kapasitelerine sahip moleküller olarak bilim dünyasının dikkatine sunulmuştur. CO2 tutuklanması için ucuz bir faktör de süreçte sulu çözücüler yerine susuz çözücülerin kullanılmasıdır. Bu değişiklik önemlidir, çünkü sulu çözücülerin korozyon ve yüksek ısıl gereksinimleri gibi bazı sorunları giderilmektedir. Bu bakımdan çalışmada CO2 ve iki sterik olarak engelli amin (2-amino-2-metil-1,3-propandiol, AMPD ve 2-amino-2-etil-1,3-propandiol, AEPD) reaksiyon kinetikleri etanollü çözeltide çalışılmıştır. CO2 ve sterik olarak engelli aminler arasındaki yalancı birinci mertebeden reaksiyon hızı sabitleri etanol içinde 288, 298 ve 308 K sıcaklıklarda doğrudan durdurulmuş akış tekniği ile ölçülmüştür. Ölçülen hız sabitleri üç moleküllü reaksiyon mekanizması kullanılarak analiz edilmiştir. CO2-AMPD ve CO2-AEPD arasındaki reaksiyonların mertebeleri (n) sırasıyla 1 ve 2 olarak tespit edilmiştir.
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