Liquid–vapor equilibria of pure and aqueous solutions of diethylenetriamine or dipropylenetriamine

• Low vapor pressure measurements of diethylenetriamine and dipropylenetriamine.
• The aqueous solutions of the triamines could be potential solvents for CO2 capture.
• NRTL and UNIQUAC models were used to correlate the experimental results.

Vapor pressures of pure and aqueous diethylenetriamine (DETA) and dipropylenetriamine (DPTA) were measured by means of a static apparatus at temperatures between (283 and 363) K. The data were correlated with the Antoine equation and fitted to Redlich–Kister equation using Barker's method. Additionally, the NRTL, UNIQUAC models were used to correlate total pressures.