Gas liquefaction method and apparatus
US4740223A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 3, 1986 |
| Grant date | Apr 26, 1988 |
| Priority date | — |
| Expiry date | Nov 3, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2290/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to the liquefaction of a permanent gas comprising nitrogen. The temperature of the permanent gas stream at a pressure in the range of 75 to 90 atmospheres is reduced to below its initial temperature. Providing at least part of the necessary refrigeration, a single nitrogen working fluid cycle is performed in which the nitrogen working fluid is compressed to a pressure in the range of 75 to 90 atmospheres, cooled to a temperature in the range of 170 to 200 K., work expanded to a temperature in the range of 107 to 120 K., and warmed by heat exchange countercurrently to the permanent gas stream, thereby providing refrigeration for the stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.