It is a colorless and flammable gas with a distinctively unpleasant smell. It is a natural substance found in the blood, brain, and feces of animals, and in plant tissues. It also occurs in certain foods, such as some nuts and cheese. It is also known as methanethiol.
CAS no: 74-93-1
Properties
Generic Properties
| Property | Value | Unit |
|---|---|---|
| Chemical Formula | CH4S | - |
| Molecular Weight | 48.109 | - |
| Heat of Combustion | 23931.2 | kJ/kg |
| Boiling Point | 279.11 | K |
| Freezing Point | 150.18 | K |
Critical Properties
| Property | Value | Unit |
|---|---|---|
| Critical Temperature | 469.95 | K |
| Critical Pressure | 72.35 | bar |
| Critical Volume | 145 | cm3/mol |
| Critical Density | 0.3318 | g/cm3 |
| Critical Z | 0.268 | - |
| Accentric Factor | 0.146 | - |
Temperature Dependent Properties
Specific Heat
The specific heat at constant pressure can be calculated with the formula:
| Constant | Gas | Liquid | Solid |
|---|---|---|---|
| A | 40.307 | 58.29 | -6.063 |
| B | -0.0036753 | 0.16072 | 0.75863 |
| C | 0.000184 | -0.00048141 | -0.0018296 |
| D | -0.000000176 | 1.0701E-06 | - |
| E | 5.0137E-11 | - | - |
| T min(K) | 100 | 160 | 100 |
| T max(K) | 1500 | 375 | 150 |
Heat of Formation
The heat of formation can be calculated with the formula:
| Constant | Value |
|---|---|
| A | 0.48094 |
| B | -0.091183 |
| C | 0.000045505 |
| T min(K) | 388.36 |
| T max (K) | 717.75 |
Viscosity
The viscosity can be calculated with the formula:
For liquid
For Gas
| Constant | Gas | Liquid |
|---|---|---|
| A | -39.38 | -133.23 |
| B | 0.467 | 16211 |
| C | -0.000062465 | 0.3576 |
| D | - | -0.00032031 |
| T min(K) | 273 | 293.15 |
| T max(K) | 473 | 446.45 |
Heat of Vaporization
The heat of vaporization can be calculated with the formula:
| Constant | Value |
|---|---|
| A | 34.579 |
| n | 0.379 |
| T min(K) | 150.18 |
| T max(K) | 469.95 |
Thermal Conductivity
The thermal conductivity can be calculated with the formula:
| Constant | Gas | Liquid |
|---|---|---|
| A | -0.0020608 | 0.2512 |
| B | 0.000019706 | -0.00020044 |
| C | 9.5496E-08 | -4.5151E-07 |
| T min(K) | 273 | 180.18 |
| T max(K) | 473 | 399.95 |
Liquid Density
The Liquid Density can be calculated with the Equation:
| Constant | Value |
|---|---|
| A | 0.3318 |
| B | 0.2802 |
| n | 0.2852 |
| T min(K) | 150.18 |
| T max(K) | 469.95 |
Diffusion Coefficient at Infinite Dilution in Water
The Diffusion Coefficient at Infinite Dilution in Water can be calculation:
| Constant | Value |
|---|---|
| A | -1.3553 |
| B | -1040.666 |
| 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 | -0.05536 |
| B | 0.00040395 |
| C | 8.0345E-07 |
| T min(K) | 200 |
| T max(K) | 1000 |