Characterization of Potential Thermal Degradation Products From the Reactions of Aqueous Ethylene Glycol and Propylene Glycol Solutions With Copper Metal.
Characterization of Potential Thermal Degradation
Products From the Reactions of Aqueous Ethylene Glycol
and Propylene Glycol Solutions With Copper Metal.
Brown, P. W.; Gaulk, K. G.; Rossiter, W. J., Jr.
Solar Energy Materials, Vol. 16, No. 4, 309-313, 1987.
ethylene glycol; propylene glycol; copper; heat transfer
fluids; thermal degradaton; solar collectors; solar
system; thermal oxidative degradation; containment;
infrared spectra; experiments; x-ray diffraction;
thermal oxidation; salts; FT-IR
Aqueous solutions of ethylene glycol and propylene
glycol are cornmon heat transfer fluids for
solar collector systems. Thermal oxidative degradation
produces organic acids which, in turn,
generate copper salts through reaction with copper
containment systems. Copper (II) salts of the
organic acids which may be generated as the result of
the degradation of the ethylene glycol and
propylene glycol were prepared by reacting aqueous
solutions of the acids with copper (II)
carbonate. Infrared spectra and X-ray diffraction peak
spacings and intensities are presented for
the salts. These spectra may be useful in analyzing the
service performance of heat transfer fluids
used in solar collector systems.