Quenching hydrocarbon effluent from catalytic reactor to avoid precipitation of asphaltene compounds
US4495060A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1982 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | Dec 27, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G47/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for high hydroconversion of petroleum residua containing at least about 25 V % material boiling above 1000.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 50 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 and the resulting liquid fractions is pressure-reduced and quenched to a temperature below about 775.degree. F. To avoid precipitation of asphaltene compounds which causes operational difficulties in the downstream equipment, the quench liquid used should have an API gravity not more than about 22.degree. API higher than the API gravity of the first pressure-reduced liquid fraction. The resulting liquid fraction is distilled to produce hydrocarbon liquid products, and a residual bottoms fraction is usually 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.