Method and apparatus for purifying a mixture comprising oil and wax
US10138433B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 10, 2016 |
| Grant date | Nov 27, 2018 |
| Priority date | — |
| Expiry date | Jun 10, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2009/0086
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to a method for fractionating a crude mixture comprising at least one oil and at least one wax, which comprises the following steps: (a) mixing the crude mixture with a solvent to obtain a crude solvent-mixture, (b) carrying out at least one crystallization stage with the solvent-mixture obtained in step (a) to prepare a first fraction containing dewaxed oil and a second fraction containing slack wax, (c) carrying out at least one crystallization stage with the second fraction obtained in step (b) in a layer crystallizer, wherein to the second fraction prior to the crystallization in step (c) no solvent or at most 100% by weight of solvent relative to the weight of the second fraction are added, to prepare a third fraction containing hard wax having an oil content of at most 1.5% by weight and a fourth fraction containing soft wax having an oil content of more than 1.5% by weight and (d) circulating at least a part of the fourth fraction into at least one of the at least one crystallization stage of step (b).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.