[12] Patent
[11] Patent No.:GC0008646  
[45] Date of Publishing the Grant of the Patent: 30/Sep /2018                53/2018  
Number of the Decision to Grant the Patent:2018/135178
Date of the Decision to Grant the Patent:19/Sep/2018

[21] Application No.:GC 2015-30185

[22] Filing Date:10/10/2015

[30] Priority:

[33] State [32] Priority date [31] Priority No.
US
10/10/2014
14/511,774

[72] Inventors:1- BRIAN KEITH JOHNSTON،2- GOWRI KRISHNAMURTHY،3- MARK JULIAN ROBERTS

[73] Owner: AIR PRODUCTS AND CHEMICALS, INC., 7201 HAMILTON BOULEVARD, ALLENTOWN, PA 18195-1501, USA

[74] Agent: Suleiman I. Al-Ammar Law Office

  

 

  

[51]IPC:
Int. Cl.: F25D 15/00; F25J 1/00, 1/02 (2006.01)

[56] Cited Documents:

-US 2010293996 A1 (VAN AKEN MICHIEL GIJSBERT [NL] ET AL) 25 November 2010
-US 2011036121 A1 (ROBERTS MARK JULIAN [US] ET AL) 17 February 2011
 
Examiner: Eng. Yusuf AlRaqabi

[54] REFRIGERANT RECOVERY IN NATURAL GAS LIQUEFACTION PROCESSES
[57] Abstract: Described herein is a method of removing refrigerant from a natural gas liquefaction system in which vaporized mixed refrigerant is withdrawn from the closed-loop refrigeration circuit and introduced into a distillation column so as to be separated into an overhead vapor enriched in methane and a bottoms liquid enriched in heavier components. Overhead vapor is withdrawn from the distillation column to form a methane enriched stream that is removed from the liquefaction system, and bottoms liquid is reintroduced from the distillation column into the closed-loop refrigeration circuit. Also described are methods of altering the rate of production in a natural gas liquefaction system in which refrigerant is removed as described above, and a natural gas liquefaction systems in which such methods can be carried out.
No. of claims: 28     No. of figures: 6


 

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