Sustained high hydroconversion of petroleum residua feedstocks
US4521295A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1982 |
| Grant date | Jun 4, 1985 |
| Priority date | — |
| Expiry date | Dec 27, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G47/26
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for high hydroconversion of petroleum residua containing at least about 25 V % material boiling above 975.degree. F. to produce lower boiling hydrocarbon liquid products and avoid undesirable precipitation of asphaltene compounds. In the process, the feedstock is at least about 80 percent catalytically hydroconverted to material boiling below 975.degree. F. and containing a mixture of gas and liquid fractions, after which the gas fraction is removed while maintaining the resulting liquid fractions temperature above about 730.degree. F. to avoid precipitation of asphaltene compounds which causes operations difficulties in the downstream equipment. Alternatively, the pressure-reduced liquid fraction can be stripped of material boiling below about 650.degree. F. before cooling the liquid to a temperature below about 730.degree. F. to prevent such precipitation of asphaltene compounds in the downstream equipment. The resulting liquid fraction is distilled to produce hydrocarbon liquid products, and a vacuum bottoms fraction is recycled to the catalytic reaction step to obtain increased percent conversion to lower boiling liquid products.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.