Nitrogen rejection unit
US9335091B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2013 |
| Grant date | May 10, 2016 |
| Priority date | — |
| Expiry date | Jul 18, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2270/42
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Methods and systems for removing nitrogen during liquefaction of natural are provided. Methods of removing nitrogen include warming a predominantly methane stream in a methane cold box to provide a warmed predominantly methane stream; conducting at least a portion of the warmed predominantly methane stream from the methane cold box to a nitrogen removal unit comprising at least a first nitrogen removal column and a last nitrogen removal column, wherein the first nitrogen removal column is located upstream of the last nitrogen removal column; passing the warmed predominantly methane stream through the last nitrogen removal column to provide a refluxed warmed predominantly methane stream; and routing at least a portion of the refluxed warmed predominantly methane stream to the last nitrogen removal column.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.