| 摘要 |
A simplified, essentially maintenance-free yet highly efficient distillation tower and method for waste oil rerefining is provided which allows direct vacuum distillation of additive-supplemented waste oils without chemical pretreatment thereof and yields a highly refined intermediate oil suitable for immediate use or final polishing, along with a valuable bottoms fraction usable in greases or asphalts, for example. The tower includes an upright, cylindrical chamber with a tangential waste oil inlet and cooperating internal baffle for creating a whirling oil flow pattern therewithin, along with means for maintaining the proper temperature conditions within the tower for maximizing vaporization and recovery of hydrocarbons from the waste oil while also preventing undesirable decomposition or cracking of the oil. In preferred forms, temperature maintenance is effected by heating the walls of the tower through the use of heating tape or plate coils; however, this same result can be achieved by flooding the tower with an excess of waste oil whereby the chamber is heated by the presence of the excess hot oil. The tower also preferably includes an apertured partition dividing the chamber into adjacent subchambers, along with a pressure-equalizing conduit in communication with the respective subchambers; this construction facilitates rapid and effective separation of the tower bottoms during processing.
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