Invention Grant
- Patent Title: Large-scale hydrogen liquefaction by means of a high pressure hydrogen refrigeration cycle combined to a novel single mixed-refrigerant precooling
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Application No.: US15771435Application Date: 2016-10-20
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Publication No.: US10928127B2Publication Date: 2021-02-23
- Inventor: Umberto Cardella , Lutz Decker , Harald Klein
- Applicant: Linde Aktiengesellschaft
- Applicant Address: DE Munich
- Assignee: Linde Aktiengesellschaft
- Current Assignee: Linde Aktiengesellschaft
- Current Assignee Address: DE Munich
- Agency: Millen White Zelano & Branigan, PC
- Agent Brion P. Heaney
- Priority: EP15003070 20151027
- International Application: PCT/EP2016/075214 WO 20161020
- International Announcement: WO2017/072019 WO 20170504
- Main IPC: F25J1/00
- IPC: F25J1/00 ; F25J1/02

Abstract:
The present invention relates to a method for liquefying hydrogen, the method comprises the steps of: cooling a feed gas stream comprising hydrogen with a pressure of at least 15 bar(a) to a temperature below the critical temperature of hydrogen in a first cooling step yielding a liquid product stream. According to the invention, the feed gas stream is cooled by a closed first cooling cycle with a high pressure first refrigerant stream comprising hydrogen, wherein the high pressure first refrigerant stream is separated into at least two partial streams, a first partial stream is expanded to low pressure, thereby producing cold to cool the precooled feed gas below the critical pressure of hydrogen, and compressed to a medium pressure, and wherein a second partial stream is expanded at least close to the medium pressure and guided into the medium pressure first partial stream.
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