Difluoromethane also called difluoromethylene, HFC-32, Methylene Fluoride, and R-32. It is a colorless gas in the ambient atmosphere and is slightly soluble in the water, with a high thermal stability.
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 |
Saturation Pressure
Saturation pressure can be calculated with the formula:
| Constant | Value |
|---|---|
| A | 7.2902 |
| B | 863.592 |
| C | 247.503 |
| T min(C) | -136.15 |
| T max(C) | 78.45 |
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 |
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 |