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:
Aug. 23, 1988
Filed:
Aug. 12, 1987
Linde Aktiengesellschaft, Wiesbaden, DE;
Abstract
In a process proposed for purification of a gas stream at elevated pressure by nitrogen scrubbing, the gas stream to be purified and the nitrogen scrubbing stream are initially cooled to low temperatures. The gas stream is then scrubbed with liquid nitrogen and the purified gas stream is mixed with cooled, high-pressure nitrogen to form a mixture in which nitrogen accumulates partly as a liquid phase. The mixture thus formed is then heated and the liquid nitrogen contained therein is evaporated. Prior to scrubbing, either the nitrogen scrubbing stream itself or a partial stream of the nitrogen scrubbing stream or another process stream under a pressure lower than the working pressure of the nitrogen scrubbing step is at least partly condensed and then pumped to a higher pressure. The condensation of this low-pressure stream provides a reduction in the temperature difference at the cold end of the heat exchangers upstream of the scrubbing step resulting in the reduction of the energy requirements of the process.