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 |