(19)
(11) EP 3 988 879 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.07.2022 Bulletin 2022/30

(43) Date of publication A2:
27.04.2022 Bulletin 2022/17

(21) Application number: 21202476.4

(22) Date of filing: 13.10.2021
(51) International Patent Classification (IPC): 
F25J 3/04(2006.01)
(52) Cooperative Patent Classification (CPC):
F25J 3/04309; F25J 3/0403; F25J 3/04381; F25J 3/04109; F25J 2240/12; F25J 2240/90; F25J 2230/04; F25J 3/0406; F25J 3/04969
(84) Designated Contracting States:
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 States:
BA ME
Designated Validation States:
KH MA MD TN

(30) Priority: 26.10.2020 CN 202011155756

(71) Applicant: L'Air Liquide, société anonyme pour l'Étude et l'Exploitation des procédés Georges Claude
75007 Paris (FR)

(72) Inventors:
  • CAO, Jian-Wei
    HANGZHOU, 310012 (CN)
  • DAY, Eric
    94503 CHAMPIGNY SUR MARNE (FR)
  • FARA, Baptiste
    94503 CHAMPIGNY SUR MARNE (FR)
  • LIN, Xu
    HANGZHOU, 310012 (CN)

(74) Representative: Air Liquide 
L'Air Liquide S.A. Direction de la Propriété Intellectuelle 75, Quai d'Orsay
75321 Paris Cedex 07
75321 Paris Cedex 07 (FR)

   


(54) METHOD AND APPARATUS FOR PRODUCING HIGH-PRESSURE NITROGEN


(57) A method for producing a high-pressure gas from an air separation unit including the steps of introducing a cold air feed into a distillation column system (20) under conditions effective for separating the cold air feed into a first air gas (22) and a second air gas; withdrawing the first and second air gases from the distillation column system and warming said first and second air gases in a main heat exchanger (10), wherein the first air gas is withdrawn from the distillation column system at a medium pressure; splitting the first air gas into a first fraction (24) and a second fraction (26); expanding the first fraction in a turbine (30); and compressing the second fraction in a booster (40) to a pressure that is higher than the medium pressure, wherein the booster is powered by the turbine







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