Hydrothermal reactions of methylamine

Kenneth M. Benjamin, Phillip E. Savage

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


We have examined the reactivity of methylamine in supercritical water (SCW) at temperatures between 386 and 500°C. The major products measured are ammonia and methanol. Batch reactor studies revealed a global reaction order of 0.66±0.11 for methylamine disappearance. For water densities less than 0.28 g/cm3 and pressures less than or equal to 250 atm, the effect of water on the reaction rate appears to be negligible, and there is little evidence of hydrolysis (very little methanol formed). Under these conditions, most typical of supercritical water oxidation (SCWO) reactors, the reaction seems to be governed by pyrolysis. The rate constant for methylamine disappearance in this region is described by an activation energy of 38±7 kcal/mol and a pre-exponential factor of 106.1±2.0 (mol/cm3)0.34 s-1. At higher water densities, hydrolysis becomes more important and the methanol yield increases with water density. Potential mechanisms for methylamine hydrolysis include SN2 and molecular mechanisms.

Original languageEnglish (US)
Pages (from-to)301-311
Number of pages11
JournalJournal of Supercritical Fluids
Issue number3
StatePublished - Nov 2004

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


Dive into the research topics of 'Hydrothermal reactions of methylamine'. Together they form a unique fingerprint.

Cite this