TY - JOUR
T1 - Pressure influences on CO2 reaction with cyclohexylamine using ionic liquid as reaction medium and catalyst
AU - Horng, Richard S.
AU - Lee, Shin Ku
AU - Hsu, Wu Te
AU - Wu, Tai Ang
N1 - Publisher Copyright:
© 2016 The Chinese Institute of Engineers.
PY - 2016/10/2
Y1 - 2016/10/2
N2 - Inserting carbon dioxide (CO2) into ammonia molecules to produce urea is a traditional CO2 utilization method. An ionic liquid (IL), 1-butyl-3-methylimidazolium bromide ([Bmim]Br), was used as reaction medium and [Bmim]Br/KOH as catalyst. This study investigates CO2 carbonylation of cyclohexylamine and its reaction performance in a number of low- and high-pressure CO2/IL systems. The reaction yield was greatly increased as pressure ranges changed from 15–50 bar to 80–100 bar; the physiochemical properties of substrates and catalyst were greatly affected by CO2 in supercritical state. The yield was improved from 69% at 30 bar to 91.6% at 100 bar, much better than a previous study result of 53.5%, but as pressures further increased, a significant decrease was observed. The reaction activation energy was calculated to be 3.942 and 4.354 kcal/mol in mild and supercritical conditions. This process shows a low threshold reaction energy and great potential for industrial applications to store CO2 in amine molecular structures.
AB - Inserting carbon dioxide (CO2) into ammonia molecules to produce urea is a traditional CO2 utilization method. An ionic liquid (IL), 1-butyl-3-methylimidazolium bromide ([Bmim]Br), was used as reaction medium and [Bmim]Br/KOH as catalyst. This study investigates CO2 carbonylation of cyclohexylamine and its reaction performance in a number of low- and high-pressure CO2/IL systems. The reaction yield was greatly increased as pressure ranges changed from 15–50 bar to 80–100 bar; the physiochemical properties of substrates and catalyst were greatly affected by CO2 in supercritical state. The yield was improved from 69% at 30 bar to 91.6% at 100 bar, much better than a previous study result of 53.5%, but as pressures further increased, a significant decrease was observed. The reaction activation energy was calculated to be 3.942 and 4.354 kcal/mol in mild and supercritical conditions. This process shows a low threshold reaction energy and great potential for industrial applications to store CO2 in amine molecular structures.
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U2 - 10.1080/02533839.2016.1203734
DO - 10.1080/02533839.2016.1203734
M3 - Article
AN - SCOPUS:84979687754
SN - 0253-3839
VL - 39
SP - 876
EP - 881
JO - Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A
JF - Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A
IS - 7
ER -