ABSTRACT

The production of phosphoric acid by wet processes is quite energy consuming. The adoption of azeotropic distillation in the evaporation process, using cyclohexane as an entrainer, may be potentially economical. The vapor liquid equilibria (VLE) data were determined by ebulliometric method for the following systems at 20, 40, 60, 80, and 101.3 kPa: (1) phosphoric acid + water + ethanol; (2) phosphoric acid + water + cyclohexane + ethanol; (3) phosphoric acid + water + cyclohexane. The electrolyte NRTL parameters for the following pairs were correlated from the VLE data by using Aspen Plus as a tool: H3PO4 H2O, H+[H2PO4]- H2O, H3PO4 C2H6O, H3PO4 C6H12, and H+[H2PO4]- C6H12. The VLE data and the obtained parameters may provide basic data for the enhancement of phosphoric acid by azeotropic distillation.

Compounds

#	Formula	Name
1	H3O4P	phosphoric acid
2	C6H12	cyclohexane
3	C2H6O	ethanol
4	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	Phase	Method	#Points
POMD	2	Boiling temperature at pressure P, K ; Liquid	Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	5
POMD	3	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	5
POMD	3 1 4	Boiling temperature at pressure P, K ; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid Mole fraction - 3; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	240
POMD	1 4	Boiling temperature at pressure P, K ; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	15
POMD	2 1 4	Triple point temperature, K ; Liquid mixture 1	Pressure, kPa; Liquid mixture 1 Mass fraction - 1; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2 Gas	Ebulliometric method (Recirculating still)	35
POMD	2 4	Triple point temperature, K ; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2 Gas	Ebulliometric method (Recirculating still)	5

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

Determination and Correlation of Vapor Liquid Equilibria for the Phosphoric Acid + Water + Cyclohexane + Ethanol System

Li, G.[Geng]

ABSTRACT