Definitions for "Vacuum distillation"
A technique for recovering heavy distillates from residue. The process lowers pressure under the level of the atmosphere, thereby reducing the temperature where hydrocarbons boil. This approach gives refiners access to molecules which would crack before they evaporated in a crude distiller.
process by which heavier cuts of crude not vaporized in the topping (atmospheric distillation) process are heated in a vaccum to accomplish their fractionation.
Distillation under reduced pressure (less the atmospheric) which lowers the boiling temperature of the liquid being distilled. This technique with its relatively low temperatures prevents cracking or decomposition of the charge stock.