It is a colorless liquid. Upon exposure to light, it decomposes. It is slightly soluble in water, but soluble in organic solvents. It is also known as methylene iodide.
CAS no: 75-11-6
Properties
Generic Properties
| Property | Value | Unit |
|---|---|---|
| Chemical Formula | CH2I2 | - |
| Molecular Weight | 267.836 | - |
| Heat of Combustion | 2425.8 | kJ/kg |
| Boiling Point | 455.15 | K |
| Freezing Point | 279.25 | K |
| Flash Point | 377.03 | K |
Critical Properties
| Property | Value | Unit |
|---|---|---|
| Critical Temperature | 747 | K |
| Critical Pressure | 54.7 | bar |
| Critical Volume | 272 | cm3/mol |
| Critical Density | 0.9847 | g/cm3 |
| Critical Z | 0.24 | - |
| Accentric Factor | 0.141 | - |
Temperature Dependent Properties
Specific Heat
The specific heat at constant pressure can be calculated with the formula:
| Constant | Gas | Liquid | Solid |
|---|---|---|---|
| A | 28.918 | 47.997 | 1 |
| B | 0.11739 | 0.5569 | 0.25353 |
| C | -0.000073808 | -0.00125 | - |
| D | 1.706E-08 | 1.1654E-06 | - |
| E | 1.2051E-14 | - | - |
| T min(K) | 100 | 280 | 149 |
| T max(K) | 1500 | 672 | 279 |
Heat of Formation
The heat of formation can be calculated with the formula:
| Constant | Value |
|---|---|
| A | 59.074 |
| B | -0.017877 |
| C | 9.8707E-06 |
| T min(K) | 458.39 |
| T max (K) | 1000 |
Viscosity
The viscosity can be calculated with the formula:
For liquid
For Gas
| Constant | Gas | Liquid |
|---|---|---|
| A | -28.175 | -1.461 |
| B | 0.5096 | 507.43 |
| C | -0.000068132 | 0.0011 |
| D | - | -0.000001847 |
| T min(K) | 288 | 279 |
| T max(K) | 573 | 747 |
Heat of Vaporization
The heat of vaporization can be calculated with the formula:
| Constant | Value |
|---|---|
| A | 61.958 |
| n | 0.446 |
| T min(K) | 279.25 |
| T max(K) | 747 |
Thermal Conductivity
The thermal conductivity can be calculated with the formula:
| Constant | Gas | Liquid |
|---|---|---|
| A | -0.0012015 | 0.151 |
| B | 0.00001072 | -0.00017351 |
| C | 1.0647E-08 | -1.3728E-08 |
| T min(K) | 288 | 279 |
| T max(K) | 573 | 710 |
Liquid Density
The Liquid Density can be calculated with the Equation:
| Constant | Value |
|---|---|
| A | 0.9848 |
| B | 0.25 |
| n | 0.2654 |
| T min(K) | 279.25 |
| T max(K) | 747 |
Saturation Pressure
The Saturation Pressure can be calculated with the Antoine Equation:
| Constant | Value |
|---|---|
| A | 6.56525 |
| B | 1211.8 |
| C | 146.897 |
| T min(C) | 6.1 |
| T max(C) | 473.85 |
Diffusion Coefficient at Infinite Dilution in Water
The Diffusion Coefficient at Infinite Dilution in Water can be calculation:
| Constant | Value |
|---|---|
| A | -1.4547 |
| B | -1053.796 |
| 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 | -0.04327 |
| B | 0.00024182 |
| C | 5.4003E-07 |
| T min(K) | 200 |
| T max(K) | 1000 |