Catalytic hydrodewaxing
US3968024A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1975 |
| Grant date | Jul 6, 1976 |
| Priority date | — |
| Expiry date | Jan 6, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S502/50
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
In the dewaxing of gas oils for the purpose of pour point reduction by catalytic hydrodewaxing using a catalyst comprising a crystalline aluminosilicate zeolite having a high silica to alumina ratio of at least 12 and a constraint index of about 1 to 12, carrying out the process at elevated temperature and pressure, including providing a hydrogen atmosphere in a preferred process configuration, the improvement of using a catalyst comprising said zeolite in microcrystalline from having a maximum crystal size of about 0.05 microns (M); and of operating the process at low pressures of up to about 500 psig, whereby not only is the catalytic activity increased but the catalyst aging rate is decreased and the product distribution is varied such that the process does not consume hydrogen but rather produces hydrogen or is at least neutral in this respect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.