Dewaxing process
US4447311A · kind A · utility
8Cited by
10References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1982 |
| Grant date | May 8, 1984 |
| Priority date | — |
| Expiry date | Jul 22, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G73/26
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A dewaxing process for reducing the pour point of waxy oils in which the oil is cooled by direct contact with a liquid autorefrigerant such as propane. The wax which separates upon cooling is removed by flotation assisted by the bubbles of vaporized autorefrigerant which rise through the oil to form a frothy slurry of wax which can be decanted and the wax recovered from it. A dewaxing solvent such as methyl ethyl ketone may be used to assist separation of the wax.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.