Specific heats and enthalpies of mixing of amine-H2O and amine-H2O-NaCl mixtures

Tjakko G. Zijlema, Geert Jan Witkamp, Gerda M. Van Rosmalen

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Specific heats of mixtures of dimethylisopropylamine (N,N-dimethyl-2-propanamine) or diisopropylamine (N-(1-methylethyl)-2-propanamine) and water and of dimethylisopropylamine and water saturated with NaCl were measured in a temperature range from 272 to 280 K at atmospheric pressure. The specific heats of the three systems all obtained maximum values in the amine weight fraction range (salt free) of 0.1 to 0.4. The enthalpies of mixing of dimethylisopropylamine or diisopropylamine and water were determined as a function of the amine concentration in the mixture. The mixing of water and the amines was strongly exothermic. The highest measured enthalpies of mixing per gram of mixture were -105 J·g-1 for dimethylisopropylamine-H2O at an amine weight fraction of 0.49 and -81 J·g-1 for diisopropylamine-H2O at an amine weight fraction of 0.60.

Original languageEnglish (US)
Pages (from-to)1335-1337
Number of pages3
JournalJournal of Chemical and Engineering Data
Volume44
Issue number6
DOIs
StatePublished - Nov 1 1999
Externally publishedYes

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

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