Slick evaporation
Two equations have been derived to describe the evaporation of a slick of liquid. One for substances with a vapour pressure of less than 20 kPa and one for substances with vapour pressures higher than 20 kPa. Substances from 300 Pascal up to 3000 Pascal are considered as Floater Evaporator for which we can make use of the formula < 20 kPa. The evaporation of such substances depends on the vapour pressure (Pascal) the molar weight (kg/kmol) and the area of the slick (km2). Two diagrams need to be used in order to predict the evaporation of a slick. The first diagram determines the area (km2) as a function of the time (hours). The second diagram determines the evaporation (% of the initial spill) as a function of the time (h) based on slick area (km2), vapour pressure (Pascal), the solubility (kg/m3) and temperature (ºC) till the whole spill is disappeared. The slick area (km2) as function of the time (h) can be predicted by the first diagram. Globules on the horizontal lines in the diagrams can be moved to the left or right to decrease or increase the variables mentioned.
| - Substance | - Molecular weight (kg/kmol) | - Vapour pressure (Pa) at 20 ºC] |
| - aniline | - 93.13 | - 40 |
| - hexanol, n- | - 102.18 | - 130 |
| - dipentene | - 136.30 | - 133 |
| - nonane | - 128.30 | - 429 |
| - styrene, monomer | - 104.15 | - 600 |
| - butanol, iso | - 74.12 | - 1200 |
| - Xylene, para | - 106 | - 1197 |
| - butyl acetate | - 116.16 | - 1160 |
| - octane | - 114.20 | - 1306 |
| - toluene | - 92.14 | - 2932 |
