Process for producing oils with a high viscosity index
US6783661B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2000 |
| Grant date | Aug 31, 2004 |
| Priority date | — |
| Expiry date | Nov 6, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G67/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for producing oils with high viscosity indices from oil distillates or effluents from a conversion unit comprises the following steps:a) catalytic hydrotreatment of the feed in the presence of hydrogen and a non zeolitic catalyst;b) fractionation of at least a portion of the effluent from step a) or step d) described below to an oil residue;c) fractionation by thermal diffusion of at least a portion of the oil residue obtained from step b) into oil fractions with different compositions and viscosity indices.Step b) can be preceded by a step d) for hydrocracking the effluent obtained from step a) in the presence of hydrogen and a zeolitic catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.