It is an organic compound that is a colorless gas in the ambient atmosphere and slightly soluble in water. It is commonly used for refrigeration or air conditioning systems. It is also known as difluroromethylene
CAS no: 75-10-5
Properties
Generic Properties
Property | Value | Unit |
---|---|---|
Chemical Formula | CH2F2 | - |
Molecular Weight | 52.024 | - |
Heat of Combustion | 3517.6 | kJ/kg |
Boiling Point | 221.5 | K |
Freezing Point | 137 | K |
Flash Point | 184.26 | K |
UEL | 27.2 | vol % |
Critical Properties
Property | Value | Unit |
---|---|---|
Critical Temperature | 351.6 | K |
Critical Pressure | 58.3 | bar |
Critical Volume | 121 | cm3/mol |
Critical Density | 0.43 | g/cm3 |
Critical Z | 0.241 | - |
Accentric Factor | 0.276 | - |
Temperature Dependent Properties
Specific Heat
The specific heat at constant pressure can be calculated with the formula:

Constant | Gas | Liquid |
---|---|---|
A | 30.323 | 55.626 |
B | 0.011176 | 0.36874 |
C | 0.00015809 | -0.0016282 |
D | -1.632E-07 | 0.000003962 |
E | 4.7955E-11 | - |
T min(K) | 100 | 147 |
T max(K) | 1500 | 287 |
Heat of Formation
The heat of formation can be calculated with the formula:

Constant | Value |
---|---|
A | -443.34 |
B | -0.034983 |
C | 0.000016546 |
T min(K) | 298.15 |
T max (K) | 1000 |
Viscosity
The viscosity can be calculated with the formula:
For liquid

For Gas

Constant | Gas | Liquid |
---|---|---|
A | -3.8067 | -0.9739 |
B | 0.5241 | 136.85 |
C | -0.00012877 | 0.0027 |
D | - | -0.000013376 |
T min(K) | 222 | 200 |
T max(K) | 1000 | 352 |
Heat of Vaporization
The heat of vaporization can be calculated with the formula:

Constant | Value |
---|---|
A | 28.364 |
n | 0.341 |
T min(K) | 137 |
T max(K) | 351.6 |
Thermal Conductivity
The thermal conductivity can be calculated with the formula:

Constant | Gas | Liquid |
---|---|---|
A | -0.0082349 | 0.3255 |
B | 0.000077931 | -0.00035445 |
C | 2.0958E-08 | -0.000001084 |
T min(K) | 222 | 137 |
T max(K) | 1000 | 334 |
Liquid Density
The Liquid Density can be calculated with the Equation:

Constant | Value |
---|---|
A | 0.4252 |
B | 0.2522 |
n | 0.281 |
T min(K) | 137 |
T max(K) | 351.6 |
Saturation Pressure
The Saturation Pressure can be calculated with the Antoine Equation:

Constant | Value |
---|---|
A | 7.2902 |
B | 863.592 |
C | 247.503 |
T min(C) | -136.15 |
T max(C) | 78.45 |
Diffusion Coefficient at Infinite Dilution in Water
The Diffusion Coefficient at Infinite Dilution in Water can be calculation:

Constant | Value |
---|---|
A | -1.3128 |
B | -1035.055 |
T min(K) | 274 |
T max(K) | 394 |
Diffusion Coefficient in Air
The Diffusion Coefficient in Air can be calculated with the Equation:

Constant | Value |
---|---|
A | -0.07307 |
B | 0.00045152 |
C | 8.6625E-07 |
T min(K) | 200 |
T max(K) | 1000 |