Patent ID: 8936718
Filing Date: 2015-01-20
Classification: B01D,C10G,C10M

Abstract:
1. A method for processing a waste oil stream comprising: a) passing the waste oil stream into a first flash distillation vessel and producing a first overhead stream and a first bottom stream; b) passing at least a portion of the first overhead stream directly out of the first flash distillation vessel via a sealed distillate outlet and passing substantially all of the first bottom stream to a heated liquid layer contained in a second flash distillation vessel and producing a second overhead stream and a second bottom stream by direct contact with the heated liquid layer; and c) passing a portion of the second bottom stream out of the second flash distillation vessel and heating and returning another portion of the second bottom stream to the second flash distillation vessel to maintain the heated liquid layer in the second distillation vessel at a selected temperature and at a selected level, the selected temperature and selected level being sufficient to flash a portion of the heated first bottom stream to the second flash distillation vessel thereby producing the second bottom stream and the second overhead stream.