The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 21, 2009
Filed:
Apr. 21, 2006
Christopher Geoffrey Spilsbury, Haslemere, GB;
Christopher Geoffrey Spilsbury, Haslemere, GB;
Air Products and Chemicals, Inc., Allentown, PA (US);
Abstract
Nitrogen is removed from a liquefied natural gas feed () by a two stage separation in which the liquefied natural gas () is first fractionated () to provide a first nitrogen-enriched overhead vapour stream () and a nitrogen-containing bottoms liquid stream () and then at least a portion of said bottoms liquid stream () is fractionated () to provide a second nitrogen-enriched overhead vapour stream () that is of lower purity than said first overhead vapour stream () and a purified liquefied natural gas stream (). The first fractionation is conducted in a distillation column () refluxed () with nitrogen overhead () condensed in a condenser () located in a flash drum () in which the second fractionation is conducted. The second nitrogen-enriched overhead vapour stream () provides fuel gas for use in the natural gas liquefaction plant.