Process for denitrogenation of a feedstock of a liquefied mixture of hydrocarbons consisting chiefly of methane and containing at least 2 mol % of nitrogen
US5421165A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1993 |
| Grant date | Jun 6, 1995 |
| Priority date | — |
| Expiry date | Aug 11, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2270/42
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention is a process for the denitrogization of a liquefied natural gas (LNG) comprising methane and at least 2 Mols. of nitrogen. The process is distinguished in that the LNG is introduced into the process as a liquid and is subject to an indirect heat exchange to cool the liquid and a further decompression before introduction into fractionation of column. A portion of the liquid flowing in the fractionation column is withdrawn and utilized to cool the LNG feedstock and is returned to the fractionation column at a level lower than the level from which it was withdrawn. The decompression of LNG feedstock comprises at least one dynamic decompression and at least one static decompression.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.