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:
Oct. 31, 2006
Filed:
Sep. 03, 2003
Stephen Roger Clare, Bognor Regis, GB;
John Douglas Oakey, Godalming, GB;
Stephen Roger Clare, Bognor Regis, GB;
John Douglas Oakey, Godalming, GB;
The BOC Group plc, Windlesham, GB;
Abstract
Nitrogen is rejected from a pressurised feed gas stream comprising methane and nitrogen by cooling the feed gas stream in a main heat exchangerand rectifying the cooled feed gas stream in a double rectification columncomprising a higher pressure rectification columna lower pressure rectification column, and a condenser-reboilerplacing the higher pressure columnin heat exchange relationship with the lower pressure columnA pumpwithdraws a methane product stream from the columnThe methane product stream is pressurised by the pumpand is vaporised in the main heat exchangerThe pressurised feed gas stream is expanded with the performance of external work in an expansion turbineupstream of the main heat exchanger