Densities, viscosities, and liquid diffusivities in aqueous piperazine and aqueous (piperazine plus N-methyldiethanolamine) solutions

P.W.J. Derks, Espen Hamborg, Kees Hogendoorn, John Niederer, Geert Versteeg

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Densities and viscosities of aqueous solutions containing both piperazine (PZ) and N-methyldiethanolamine (MDEA) have been determined at a temperature range from (293.15 to 323.15) K. The concentrations of MDEA have been kept constant at (1, 2, 3, and 4) mol·dm−3 with the concentration of PZ varying from (0 to 1) mol·dm−3. Liquid diffusivities of aqueous PZ solutions have been determined using the Taylor dispersion technique over a temperature range from (293.15 to 368.15) K and concentrations from (0 to 1.5) mol·dm−3. At infinite dilution, the method proposed by Othmer & Thakar can be used to estimate the liquid diffusivities, and a modified Stokes−Einstein relation can be used to predict the diffusivities at higher concentrations. Liquid diffusivities of both PZ and MDEA have been determined in aqueous solutions containing 4.0 mol·dm−3 MDEA and (0, 0.5, and 1.0) mol·dm−3 PZ at a temperature range from (298.15 to 368.15) K. The liquid diffusivities can be estimated by a modified Stokes−Einstein relation.
Original languageUndefined
Pages (from-to)1179-1185
Number of pages7
JournalJournal of chemical & engineering data
Issue number5
Publication statusPublished - 2008


  • IR-82900
  • METIS-252151

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