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1. (WO2013126060) HE-3 RECOVERY FROM NATURAL HELIUM BY DISTILLATION

Pub. No.:    WO/2013/126060    International Application No.:    PCT/US2012/026293
Publication Date: Fri Aug 30 01:59:59 CEST 2013 International Filing Date: Fri Feb 24 00:59:59 CET 2012
IPC: B01D 59/04
F25J 3/02
Applicants: AIR PRODUCTS AND CHEMICALS, INC.
XU, Jianguo
GRAHAM, David, Ross
PAREKH, Vipul, S.
Inventors: XU, Jianguo
GRAHAM, David, Ross
PAREKH, Vipul, S.
Title: HE-3 RECOVERY FROM NATURAL HELIUM BY DISTILLATION
Abstract:
A system and method for recovering helium-3 from helium. A distillation column having a top section that is smaller in diameter than a main section is provided. The column also includes an intermediate condenser located in the main section and above a helium feed stream. Reflux to the column can be provided by liquid helium-3 from a conduit orfrom an overhead condenser. In a preferred cycle, the distillation column is operated at a subatmospheric pressure, and in a temperature range between 2.3 K and 4.3 K.