Production of high viscosity index lubricants
US5288395A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1991 |
| Grant date | Feb 22, 1994 |
| Priority date | — |
| Expiry date | Jul 24, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J29/041
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Petroleum wax feeds are converted to high viscosity index lubricants by a two-step hydrocracking-hydroisomerization process in which the wax feed is initially subjected to hydrocracking under mild conditions with a conversion to non-lube range products of no more than about 40 weight percent of the feed. The hydrocracking is carried out at a hydrogen pressure of at least 1,000 psig (7,000 kPa) using an amorphous or mesoporous crystalline catalyst which preferentially removes the aromatic components present in the initial feed. The hydrocracked effluent is then subjected to hydroisomerization in a second step using a low acidity hydroisomerization catalyst which effects a preferential isomerization on the paraffin components to less waxy, high VI isoparaffins. The second stage, which is carried out at relatively low temperature, typically from 600.degree. to 650.degree. F. with a 650.degree. F.+ conversion in the range of 10 to 20 weight percent of the second stage feed but with high selectivity for isomerization of the paraffins, is carried out in the presence of a catalyst which contains a hydrogenation component, preferably a noble metal such as platinum, on a mesoporous support …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.