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Thermophysical Data for Process Design
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DDB#	Name	CAS-RN	Formula
174	Water	7732-18-5	H₂O	Overview	Details
2421	Phosphorus pentoxide	1314-56-3	O₅P₂	Overview	Details
6356	Potassium dihydrogen phosphate	7778-77-0	H₂KO₄P	Overview	Details
18712	Potassium oxide		K₂O	Overview	Details
1001367	Dipotassium hydrogen phosphate hexahydrate		K₂HPO₄*6H₂O	Overview	Details
1006846	Potassium hydrogen pyrophosphate trihydrate		K₃HP₂O₇*3H₂O	Overview	Details
1007539	Dipotassium dihydrogen pyrophosphate semihydrate		K₂H₂P₂O₇*0.₅H₂O	Overview	Details

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Mixture Data

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**Vapor-Liquid Equilibria (VLE)**
DDB#	Name	2421	6356	18712	1001367	1006846	1007539	Dipotassium dihydrogen pyrophosphate semihydrate
174	Water	13	n.a.	n.a.	n.a.	n.a.	n.a.
2421	Phosphorus pentoxide		n.a.	n.a.	n.a.	n.a.	n.a.
6356	Potassium dihydrogen phosphate			n.a.	n.a.	n.a.	n.a.
18712	Potassium oxide				n.a.	n.a.	n.a.
1001367	Dipotassium hydrogen phosphate hexahydrate					n.a.	n.a.
1006846	Potassium hydrogen pyrophosphate trihydrate						n.a.

**Liquid-Liquid Equilibria (Miscibility Gaps) (LLE)**
DDB#	Name	2421	6356	18712	1001367	1006846	1007539	Dipotassium dihydrogen pyrophosphate semihydrate
174	Water	n.a.	2	n.a.	n.a.	n.a.	n.a.
2421	Phosphorus pentoxide		n.a.	n.a.	n.a.	n.a.	n.a.
6356	Potassium dihydrogen phosphate			n.a.	n.a.	n.a.	n.a.
18712	Potassium oxide				n.a.	n.a.	n.a.
1001367	Dipotassium hydrogen phosphate hexahydrate					n.a.	n.a.
1006846	Potassium hydrogen pyrophosphate trihydrate						n.a.

**Heat Capacities of Mixtures, Excess Heat Capacities (CPE)**
DDB#	Name	2421	6356	18712	1001367	1006846	1007539	Dipotassium dihydrogen pyrophosphate semihydrate
174	Water	4	5	n.a.	n.a.	n.a.	n.a.
2421	Phosphorus pentoxide		n.a.	n.a.	n.a.	n.a.	n.a.
6356	Potassium dihydrogen phosphate			n.a.	n.a.	n.a.	n.a.
18712	Potassium oxide				n.a.	n.a.	n.a.
1001367	Dipotassium hydrogen phosphate hexahydrate					n.a.	n.a.
1006846	Potassium hydrogen pyrophosphate trihydrate						n.a.

**(A)zeotropic Data (AZD)**
DDB#	Name	2421	6356	18712	1001367	1006846	1007539	Dipotassium dihydrogen pyrophosphate semihydrate
174	Water	9	n.a.	n.a.	n.a.	n.a.	n.a.
2421	Phosphorus pentoxide		n.a.	n.a.	n.a.	n.a.	n.a.
6356	Potassium dihydrogen phosphate			n.a.	n.a.	n.a.	n.a.
18712	Potassium oxide				n.a.	n.a.	n.a.
1001367	Dipotassium hydrogen phosphate hexahydrate					n.a.	n.a.
1006846	Potassium hydrogen pyrophosphate trihydrate						n.a.

**Solid-Liquid Equilibria (SLE)**
DDB#	Name	2421	6356	18712	1001367	1006846	1007539	Dipotassium dihydrogen pyrophosphate semihydrate
174	Water	7	1	n.a.	n.a.	n.a.	n.a.
2421	Phosphorus pentoxide		n.a.	n.a.	n.a.	n.a.	n.a.
6356	Potassium dihydrogen phosphate			n.a.	n.a.	n.a.	n.a.
18712	Potassium oxide				n.a.	n.a.	n.a.
1001367	Dipotassium hydrogen phosphate hexahydrate					n.a.	n.a.
1006846	Potassium hydrogen pyrophosphate trihydrate						n.a.

**Vapor-Liquid Equilibria of Electrolyte Systems (ELE)**
DDB#	Name	2421	6356	18712	1001367	1006846	1007539	Dipotassium dihydrogen pyrophosphate semihydrate
174	Water	n.a.	23	n.a.	n.a.	n.a.	n.a.
2421	Phosphorus pentoxide		n.a.	n.a.	n.a.	n.a.	n.a.
6356	Potassium dihydrogen phosphate			n.a.	n.a.	n.a.	n.a.
18712	Potassium oxide				n.a.	n.a.	n.a.
1001367	Dipotassium hydrogen phosphate hexahydrate					n.a.	n.a.
1006846	Potassium hydrogen pyrophosphate trihydrate						n.a.

**Densities and Volumes of Mixtures, Excess Volumes (VE)**
DDB#	Name	2421	6356	18712	1001367	1006846	1007539	Dipotassium dihydrogen pyrophosphate semihydrate
174	Water	15	19	n.a.	n.a.	n.a.	n.a.
2421	Phosphorus pentoxide		n.a.	n.a.	n.a.	n.a.	n.a.
6356	Potassium dihydrogen phosphate			n.a.	n.a.	n.a.	n.a.
18712	Potassium oxide				n.a.	n.a.	n.a.
1001367	Dipotassium hydrogen phosphate hexahydrate					n.a.	n.a.
1006846	Potassium hydrogen pyrophosphate trihydrate						n.a.

**Salt Solubilities (ESLE)**
DDB#	Name	2421	6356	18712	1001367	1006846	1007539	Dipotassium dihydrogen pyrophosphate semihydrate
174	Water	n.a.	43	n.a.	n.a.	n.a.	n.a.
2421	Phosphorus pentoxide		n.a.	n.a.	n.a.	n.a.	n.a.
6356	Potassium dihydrogen phosphate			n.a.	n.a.	n.a.	n.a.
18712	Potassium oxide				n.a.	n.a.	n.a.
1001367	Dipotassium hydrogen phosphate hexahydrate					n.a.	n.a.
1006846	Potassium hydrogen pyrophosphate trihydrate						n.a.

**Mixture Viscosities (VIS)**
DDB#	Name	2421	6356	18712	1001367	1006846	1007539	Dipotassium dihydrogen pyrophosphate semihydrate
174	Water	14	12	n.a.	n.a.	n.a.	n.a.
2421	Phosphorus pentoxide		n.a.	n.a.	n.a.	n.a.	n.a.
6356	Potassium dihydrogen phosphate			n.a.	n.a.	n.a.	n.a.
18712	Potassium oxide				n.a.	n.a.	n.a.
1001367	Dipotassium hydrogen phosphate hexahydrate					n.a.	n.a.
1006846	Potassium hydrogen pyrophosphate trihydrate						n.a.

**Mixture Surface Tensions (MSFT)**
DDB#	Name	2421	6356	18712	1001367	1006846	1007539	Dipotassium dihydrogen pyrophosphate semihydrate
174	Water	n.a.	5	n.a.	n.a.	n.a.	n.a.
2421	Phosphorus pentoxide		n.a.	n.a.	n.a.	n.a.	n.a.
6356	Potassium dihydrogen phosphate			n.a.	n.a.	n.a.	n.a.
18712	Potassium oxide				n.a.	n.a.	n.a.
1001367	Dipotassium hydrogen phosphate hexahydrate					n.a.	n.a.
1006846	Potassium hydrogen pyrophosphate trihydrate						n.a.

**Mixture Speeds of Sound (MSOS)**
DDB#	Name	2421	6356	18712	1001367	1006846	1007539	Dipotassium dihydrogen pyrophosphate semihydrate
174	Water	n.a.	8	n.a.	n.a.	n.a.	n.a.
2421	Phosphorus pentoxide		n.a.	n.a.	n.a.	n.a.	n.a.
6356	Potassium dihydrogen phosphate			n.a.	n.a.	n.a.	n.a.
18712	Potassium oxide				n.a.	n.a.	n.a.
1001367	Dipotassium hydrogen phosphate hexahydrate					n.a.	n.a.
1006846	Potassium hydrogen pyrophosphate trihydrate						n.a.

**Mixture Thermal Conductivities (MTCN)**
DDB#	Name	2421	6356	18712	1001367	1006846	1007539	Dipotassium dihydrogen pyrophosphate semihydrate
174	Water	n.a.	1	n.a.	n.a.	n.a.	n.a.
2421	Phosphorus pentoxide		n.a.	n.a.	n.a.	n.a.	n.a.
6356	Potassium dihydrogen phosphate			n.a.	n.a.	n.a.	n.a.
18712	Potassium oxide				n.a.	n.a.	n.a.
1001367	Dipotassium hydrogen phosphate hexahydrate					n.a.	n.a.
1006846	Potassium hydrogen pyrophosphate trihydrate						n.a.

**Electrical Conductivities (ECND)**
DDB#	Name	2421	6356	18712	1001367	1006846	1007539	Dipotassium dihydrogen pyrophosphate semihydrate
174	Water	n.a.	9	n.a.	n.a.	n.a.	n.a.
2421	Phosphorus pentoxide		n.a.	n.a.	n.a.	n.a.	n.a.
6356	Potassium dihydrogen phosphate			n.a.	n.a.	n.a.	n.a.
18712	Potassium oxide				n.a.	n.a.	n.a.
1001367	Dipotassium hydrogen phosphate hexahydrate					n.a.	n.a.
1006846	Potassium hydrogen pyrophosphate trihydrate						n.a.

**Further Thermodynamic Properties (X)**
DDB#	Name	2421	6356	18712	1001367	1006846	1007539	Dipotassium dihydrogen pyrophosphate semihydrate
174	Water	1	4	n.a.	n.a.	n.a.	n.a.
2421	Phosphorus pentoxide		n.a.	n.a.	n.a.	n.a.	n.a.
6356	Potassium dihydrogen phosphate			n.a.	n.a.	n.a.	n.a.
18712	Potassium oxide				n.a.	n.a.	n.a.
1001367	Dipotassium hydrogen phosphate hexahydrate					n.a.	n.a.
1006846	Potassium hydrogen pyrophosphate trihydrate						n.a.

**Total**
DDB#	Name	2421	6356	18712	1001367	1006846	1007539	Dipotassium dihydrogen pyrophosphate semihydrate
174	Water	63	132	n.a.	n.a.	n.a.	n.a.
2421	Phosphorus pentoxide		n.a.	n.a.	n.a.	n.a.	n.a.
6356	Potassium dihydrogen phosphate			n.a.	n.a.	n.a.	n.a.
18712	Potassium oxide				n.a.	n.a.	n.a.
1001367	Dipotassium hydrogen phosphate hexahydrate					n.a.	n.a.
1006846	Potassium hydrogen pyrophosphate trihydrate						n.a.

Dortmund Data Bank Version: February 2024

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