ABSTRACT

Calcium hypophosphite has been widely used as an anti-corrosive agent, flame retardant, fertilizer, assistant for Ni electroless plating, and animal nutritional supplement. High purity calcium hypophosphite can be synthesized via the replacement reaction of sodium hypophosphite and calcium chloride. In this work, the (solid + liquid) phase equilibria of (Ca(H2PO2)2 + CaCl2 + H2O) and (Ca(H2PO2)2 + NaH2PO2 + H2O) ternary systems at T = 323.15 K were studied experimentally via the classical isothermal solubility equilibrium method, and the phase diagrams for these two systems were obtained. It was found that two solid salts of CaCl2 2H2O and Ca(H2PO2)2 exist in the (Ca(H2PO2)2 + CaCl2 + H2O) system, and three salts of Ca(H2PO2)2, NaH2PO2 H2O and one incompatible double salt, NaCa(H2PO2)3 occur in the (Ca(H2PO2)2 + NaH2PO2 + H2O) system.

Compounds

#	Formula	Name
1	H2O	water
2	CaH4O4P2	calcium hypophosphite
3	CaCl2	calcium chloride
4	H2NaO2P	sodium phosphinate

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 2 3	Mass fraction - 3 ; Liquid	Mass fraction - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Crystal - 2	Titration method	9
POMD	1 2 3	Mass fraction - 3 ; Liquid	Mass fraction - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Crystal of intercomponent compound 1	Titration method	3
POMD	1 2 3	Mass density, kg/m3 ; Liquid	Mass fraction - 2; Liquid Mass fraction - 3; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Vibrating tube method	11
POMD	1 2 3	Mass fraction - 2 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid Crystal - 2 Crystal of intercomponent compound 1	Titration method	1
POMD	1 2 3	Mass fraction - 3 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid Crystal - 2 Crystal of intercomponent compound 1	Titration method	1
POMD	4 1 2	Mass fraction - 4 ; Liquid	Mass fraction - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Crystal - 2	Titration method	4
POMD	4 1 2	Mass fraction - 4 ; Liquid	Mass fraction - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Crystal of intercomponent compound 1	Titration method	9
POMD	4 1 2	Mass density, kg/m3 ; Liquid	Mass fraction - 2; Liquid Mass fraction - 4; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Vibrating tube method	13
POMD	4 1 2	Mass fraction - 2 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid Crystal - 2 Crystal of intercomponent compound 1	Titration method	1
POMD	4 1 2	Mass fraction - 4 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid Crystal - 2 Crystal of intercomponent compound 1	Titration method	1
POMD	4 1 2	Mass fraction - 4 ; Liquid	Mass fraction - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Crystal of intercomponent compound 2	Titration method	2
POMD	4 1 2	Mass fraction - 2 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid Crystal of intercomponent compound 1 Crystal of intercomponent compound 2	Titration method	1
POMD	4 1 2	Mass fraction - 4 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid Crystal of intercomponent compound 1 Crystal of intercomponent compound 2	Titration method	1
POMD	1 2	Mass fraction - 2 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid Crystal - 2	Titration method	1
POMD	1 2	Mass density, kg/m3 ; Liquid	Mass fraction - 2; Liquid Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Vibrating tube method	1
POMD	1 3	Mass fraction - 3 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid Crystal of intercomponent compound 1	Titration method	1
POMD	1 3	Mass density, kg/m3 ; Liquid	Mass fraction - 3; Liquid Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Vibrating tube method	1
POMD	4 1	Mass density, kg/m3 ; Liquid	Mass fraction - 4; Liquid Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Vibrating tube method	1
POMD	4 1	Mass fraction - 4 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid Crystal of intercomponent compound 1	Titration method	1

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

(Solid + liquid) phase equilibria of (Ca(H2PO2)2 + CaCl2 + H2O) and (Ca(H2PO2)2 + NaH2PO2 + H2O) ternary systems at T = 323.15 K

Cao, H.-y.[Hong-yu], Zhou, H.[Huan], Bai, X.-q.[Xiao-qin], Ma, R.-x.[Ruo-xin], Tan, L.-n.[Li-na], Wang, J.-m.[Jun-min]

ABSTRACT