Plural stage distillation of a natural gas stream
US3983711A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 2, 1975 |
| Grant date | Oct 5, 1976 |
| Priority date | — |
| Expiry date | Jan 2, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/151
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Natural gas, containing carbon dioxide and nitrogen, is demethanized in a first fractional distillation tower to provide an overhead of nitrogen and methane free of carbon dioxide and components heavier than methane. A sidestream is withdrawn from the first tower at a point therein where carbon dioxide concentration is maximized and the sidestream is fractionated in a second tower to recover methane and carbon dioxide as overhead. Nitrogen is rejected from the carbon dioxide free overhead from the first tower by liquefaction of methane to provide a send-out gas free of nitrogen. The cold potential of various streams is used to provide cooling requirements for the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.