- Patent Title: Method for liquefying natural gas and for recovering possible liquids from the natural gas, comprising two refrigerant cycles semi-open to the natural gas and a refrigerant cycle closed to the refrigerant gas
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Application No.: US16315115Application Date: 2017-06-20
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Publication No.: US11255602B2Publication Date: 2022-02-22
- Inventor: Eric Zielinski , Nathalie Trichard , Julien Bellande , Benjamin Rodier
- Applicant: SAIPEM S.P.A.
- Applicant Address: FR Montigny le Bretonneux
- Assignee: SAIPEM S.P.A.
- Current Assignee: SAIPEM S.P.A.
- Current Assignee Address: FR Montigny le Bretonneux
- Agency: Cozen O'Connor
- Priority: FR1656460 20160706
- International Application: PCT/FR2017/051630 WO 20170620
- International Announcement: WO2018/007710 WO 20180111
- Main IPC: F25J1/02
- IPC: F25J1/02 ; F25J1/00
Abstract:
A process for liquefying a natural gas comprising a mixture of hydrocarbons predominating in methane, the process comprising a first semi-open refrigerant cycle with natural gas in which any natural gas liquids that have condensed are separated from the natural gas feed stream, which stream then passes through a main cryogenic heat exchanger (4) in order to contribute by heat exchange to pre-cooling a main natural gas stream (F-P) and to cooling an initial refrigerant gas stream (G-0), a second semi-open refrigerant cycle with natural gas for contributing to pre-cooling the natural gas and the refrigerant and also to liquefying the natural gas, and a closed refrigerant cycle with refrigerant gas for subcooling the liquefied natural gas and for delivering refrigeration power in addition to the other two cycles. The invention also provides a natural gas liquefaction installation for performing such a process.
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