High viscosity index lubricants
US4975177A · kind A · utility
101Cited by
15References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1989 |
| Grant date | Dec 4, 1990 |
| Priority date | — |
| Expiry date | Jul 17, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G67/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Lubricant basestocks of high viscosity index, typically with V.I. of at least 130 or higher, and low pour point, typically below 5.degree. F., are produced by hydroisomerizing petroleum waxes such as slack wax or de-oiled wax, over zeolite beta and then dewaxing to target pour point. A preferred process employs a solvent dewaxing after the hydroisomerization step to effect a partial dewaxing with the separated waxes being recycled to the hydroisomerization step; dewaxing is then completed catalytically, typically over ZSM-5 or ZSM-23.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.