Kinetics of N-Nitrosopiperazine Formation from Nitrite and Piperazine in CO2 Capture
Citations Over TimeTop 10% of 2013 papers
Abstract
Piperazine (PZ) is an efficient amine for carbon capture systems, but it can form N-nitrosopiperazine (MNPZ), a carcinogen, from nitrogen oxides (NO(x)) in flue gas from coal or natural gas combustion. The reaction of nitrite with PZ was studied in 0.1 to 5 mol/dm(3) PZ with 0.001 to 0.8 mol CO2/mol PZ at 50 to 135 °C. The reaction forming MNPZ is first order in nitrite, piperazine carbamate species, and hydronium ion. The activation energy is 84 ± 2 kJ/mol with a rate constant of 8.5 × 10(3) ± 1.4 × 10(3) dm(6) mol(-2) s(-1) at 100 °C. The proposed mechanism involves protonation of the carbamate species, nucleophilic attack of the carbamic acid, and formation of bicarbonate and MNPZ. These kinetics and mechanism will be useful in identifying inhibitors and other strategies to reduce nitrosamine accumulation in CO2 capture by scrubbing with PZ or other amines.
Related Papers
- → HD exchange kinetics of alcohols and protonated peptides: Effects of structure and proton affinity(1995)37 cited
- → Studies in cyclophosphazenes. Part II. The kinetics of the reactions of chlorocyclotriphosphazenes with dimethylamine in tetrahydrofuran(1971)15 cited
- → ChemInform Abstract: Protonated 1,3,4,5‐Tetramethylbicyclo[3.1.0]hex‐3‐en‐2‐one Hexachloroantimonate(1986)
- → ChemInform Abstract: Reduction Chemistry of Fe2(NO)4(μ‐PR2)2 (R: Ph, Cy) and Protonation and Alkylation of Resultant Binuclear Iron Nitrosyl Anions.(1987)
- → ChemInform Abstract: Brönsted Coefficients for Intramolecularly Assisted Carbon Protonation of Amine Adducts of Benzylidene Meldrum′s Acid.(1986)