ABSTRACT

In natural gas dehydration units, rich TEG solutions are decompressed before the EG regeneration stage and the direction of the temperature change during the decompression has been debated. The temperature change from an isenthalpic expansion from (7000 kPa to 440 kPa was measured for the following aqueous mixtures: pure water, 99 % pure triethylene glycol (TEG), aqueous TEG (99 wt % TEG + 1 % water), aqueous TEG saturated with methane, aqueous TEG saturated with n-pentane, and aqueous TEG saturated with n-heptane. In all cases, the temperature increased upon expansion with the magnitude of the temperature change ranging from 1.4 K for pure water to 2.4 K for TEG. A simple equation of state model predicted the correct direction for the temperature change and the predicted values were within +-1 K of the experimental data.

Compounds

#	Formula	Name
1	C6H14O4	triethylene glycol
2	H2O	water

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1	Joule-Thomson coefficient, K/kPa ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Expansion technique	1
POMD	2	Joule-Thomson coefficient, K/kPa ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Expansion technique	1
POMD	1 2	Joule-Thomson coefficient, K/kPa ; Liquid	Mass fraction - 1; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Expansion technique	3

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Temperature change from isenthalpic expansion of aqueous triethylene glycol mixtures for natural gas dehydration

Satyro, M. A.[Marco A.], Schoeggl, F.[Florian], Yarranton, H. W.[Harvey W.]

ABSTRACT