Thermophysical properties of aqueous piperazine and aqueous (N-methyldiethanolamine + piperazine) solutions at temperatures (298.15 to 338.15) K

• Main Authors: A., Muhammad, M.I.A., Mutalib, T., Murugesan, A., Shafeeq
• Format: Citation Index Journal
• Published: 2009
• Subjects: TP Chemical technology
• Online Access: http://eprints.utp.edu.my/595/1/paper.pdf; http://www.scopus.com/inward/record.url?eid=2-s2.0-69049112226&partnerID=40&md5=9a08782de91d7c1694113c7ff7511309; http://eprints.utp.edu.my/595/
• Institution: Universiti Teknologi Petronas

In the present work, thermophysical properties such as density (ρ), dynamic viscosity (η), refractive index (nD), and surface tension (σ) of aqueous piperazine (PZ) solutions with mass fractions (100w = 1.74, 5.16, 10.35) have been measured from temperatures (298.15 to 338.15) K. All of these properties have also been measured for the aqueous blends of N-methyldiethanolamine (MDEA) and piperazine (PZ) with mass fractions {100(w1/w2)= 32.28/1.74, 32.28/5.16, 32.28/10.35, 48.80/1.74, 48.80/5.16, 48.80/10.35)} for the entire temperature range. The limit of PZ solubility in water was measured by the addition of a known quantity of anhydrous PZ (solid crystals) in 20 mL of distilled water at temperatures (278 to 343) K with a regular interval of 5 K. The experimental values of the studied physical properties have been compared with the literature and also correlated as a function of temperature. The coefficients of thermal expansion (αp) values have been calculated from their experimental density data using an empirical correlation. A thermogravimetric analyzer (TGA) has been used to explore the thermal stability of the studied solvent systems at a heating rate of 10 °C• min-1. © 2009 American Chemical Society.