US 10,890,375 B2
Method for liquefying natural gas and nitrogen
Nicolas Chambron, Saint Maur des Fosses (FR); Richard Dubettier-Grenier, La Varenne Saint Hilaire (FR); Loic Joly, Paris (FR); Vianney Meunier, Paris (FR); and Christophe Szamlewski, Combs la Ville (FR)
Assigned to L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude, Paris (FR)
Appl. No. 16/60,077
Filed by L'Air Liquide, Société Anonyme pour I'Etude et I'Exploitation des Procédés Georges Claude, Paris (FR)
PCT Filed Nov. 8, 2016, PCT No. PCT/FR2016/052888
§ 371(c)(1), (2) Date Jun. 7, 2018,
PCT Pub. No. WO2017/098099, PCT Pub. Date Jun. 15, 2017.
Claims priority of application No. 15 61923 (FR), filed on Dec. 7, 2015.
Prior Publication US 2018/0372404 A1, Dec. 27, 2018
Int. Cl. F25J 1/02 (2006.01); F25J 3/04 (2006.01); F25J 1/00 (2006.01)
CPC F25J 1/0022 (2013.01) [F25J 1/005 (2013.01); F25J 1/0015 (2013.01); F25J 1/0037 (2013.01); F25J 1/0072 (2013.01); F25J 1/0202 (2013.01); F25J 1/0204 (2013.01); F25J 1/0234 (2013.01); F25J 1/0236 (2013.01); F25J 1/0288 (2013.01); F25J 3/04224 (2013.01); F25J 3/04278 (2013.01); F25J 3/04357 (2013.01); F25J 3/04393 (2013.01); F25J 3/04412 (2013.01); F25J 2245/42 (2013.01); F25J 2270/06 (2013.01); F25J 2270/16 (2013.01); F25J 2270/42 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A method for producing liquefied natural gas and a stream of liquid nitrogen, comprising at least the following steps:
Step a): producing gaseous nitrogen in an air separation unit;
Step b): liquefying a stream of natural gas in a natural gas liquefaction unit comprising a main heat exchanger and a refrigeration system;
Step c): liquefying the nitrogen stream resulting from step a) in the main heat exchanger of the natural gas liquefaction unit in parallel with the liquefied natural gas in step b) and exporting at least a portion of the liquefied nitrogen stream as a product;
wherein all the refrigeration necessary for liquefying the stream of nitrogen and for liquefying the natural gas is supplied by said refrigeration system of the natural gas liquefaction unit.