ABSTRACT

The solubilities of gallic acid and its esters (methyl gallate, propyl gallate, and octyl gallate) in water were determined in the temperature range (273.15 to 363.15) K by a static analytical method. The concentrations of gallic acid and the esters in saturated solution were analyzed by reverse-phase high-performance liquid chromatography. An S type curve was found for the solubilities of gallic acid and octyl gallate in water over the investigated temperature range. An empirical equation was proposed to fit the data for gallic acid and octyl gallate. On the other hand, the data of methyl gallate and propyl gallate were in good agreement with the simplified i-h equation.

Compounds

#	Formula	Name
1	C7H6O5	3,4,5-trihydroxybenzoic acid
2	C8H8O5	benzoic acid, 3,4,5-trihydroxy-, methyl ester
3	C10H12O5	propyl 3,4,5-trihydroxybenzoate
4	C15H22O5	benzoic acid, 3,4,5-trihydroxy-, octyl ester
5	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 5	Mass ratio of solute to solvent ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 1	static analytical method	16
POMD	2 5	Mass ratio of solute to solvent ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 2	static analytical method	12
POMD	3 5	Mass ratio of solute to solvent ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 3	static analytical method	11
POMD	4 5	Mass ratio of solute to solvent ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 4	static analytical method	8

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Solubilities of Gallic Acid and Its Esters in Water

Lu, L.-L.[Li-Li], Lu, X.-Y.[Xiu-Yang]

ABSTRACT