Method and apparatus for cooling a gas
US3945214A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 1974 |
| Grant date | Mar 23, 1976 |
| Priority date | — |
| Expiry date | Jul 3, 1994 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2240/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to methods and a system for cooling a gas for the purpose of effecting the liquefaction of one or more components of this gas. The invention is more precisely concerned with the prevention of losses by evaporation from the tanks of methane-carrier ships during the transport of liquid methane. For this purpose, the evaporation leakages from the tanks in gaseous form are re-liquefied by ad hoc liquefaction apparatus aboard the ship. The apparatus utilizes a cascade frigorific cycle of the open type working with a single refrigerant having a plurality of components. The refrigerant comprises the pure substance to be re-liquefied, and at least one heavy component, less volatile than the said substance, and absent from the composition of the gas treated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.