EP 4204603 A1 20230705 - HEAT RECOVERY DURING ELECTROLYSIS PROCESSES
Title (en)
HEAT RECOVERY DURING ELECTROLYSIS PROCESSES
Title (de)
WÄRMERÜCKGEWINNUNG BEI ELEKTROLYSEPROZESSEN
Title (fr)
RÉCUPÉRATION DE CHALEUR LORS DE PROCÉDÉS D'ÉLECTROLYSE
Publication
Application
Priority
- DE 102020005242 A 20200827
- EP 2021025226 W 20210623
Abstract (en)
[origin: WO2022042876A1] The invention relates to a method for electrolytically producing at least one product stream containing hydrogen, wherein a feed stream (1, 2) containing at least water is subjected to electrolysis (E) so as to obtain two extraction streams (3, 4). Downstream of the electrolysis (E), the two extraction streams (3, 4) are subjected to separation (S1, S2) so as to obtain the at least one product stream (6, 7) and two liquid fractions (2, 5) containing water. At least one of the two liquid fractions (2, 5) is fed back at least in part to the electrolysis (E). Upstream of the electrolysis (E), the feed stream (1, 2) is heated by exchanging heat with at least one of the two extraction streams (3, 4). The at least one extraction stream (3) from which heat is removed by means of the heat exchange is subjected to additional cooling, the additional cooling taking place by using an organic Rankine cycle or a Rankine cycle that uses an organic-chemical heat transport medium (O). The electrolysis (E) is thus operated at a higher temperature level than is usually the case, because the cooling effect is lower as a result of the feed pre-heating. This brings about an increase in efficiency when the electrolysis (E) is in operation. The higher temperature level of the electrolysis (E) also produces the effect that waste heat is produced at a higher temperature than usual. An organic Rankine cycle can thus be used efficiently for waste heat recovery. The invention also relates to a corresponding system (300) for carrying out the method.
IPC 8 full level
C25B 1/04 (2021.01); C25B 9/00 (2021.01); C25B 9/19 (2021.01); C25B 15/021 (2021.01); C25B 15/08 (2006.01)
CPC (source: EP KR US)
C25B 1/04 (2013.01 - EP KR US); C25B 1/50 (2021.01 - KR); C25B 9/00 (2013.01 - EP); C25B 9/19 (2021.01 - EP KR); C25B 15/021 (2021.01 - EP KR US); C25B 15/083 (2021.01 - EP KR US); C25B 15/087 (2021.01 - EP KR US); C25B 9/00 (2013.01 - KR); Y02E 60/36 (2013.01 - EP KR); Y02P 20/129 (2015.11 - EP KR); Y02P 20/133 (2015.11 - EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
DE 102020005242 A1 20220303; AU 2021331003 A1 20230323; BR 112023003224 A2 20230328; CL 2023000518 A1 20231020; CN 115943230 A 20230407; EP 4204603 A1 20230705; JP 2023540467 A 20230925; KR 20230056684 A 20230427; US 2023332302 A1 20231019; WO 2022042876 A1 20220303
DOCDB simple family (application)
DE 102020005242 A 20200827; AU 2021331003 A 20210623; BR 112023003224 A 20210623; CL 2023000518 A 20230221; CN 202180051172 A 20210623; EP 2021025226 W 20210623; EP 21737562 A 20210623; JP 2023513418 A 20210623; KR 20237006469 A 20210623; US 202118042539 A 20210623