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- RICH INTERNATIONAL TRADE CO .,LTD
- Address: No.2099, Tingwei Road , Shanyang Town, Jinshan District, Shanghai,China,201508
- Tel: 86-021-51361111
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High efficiency nitrogen generator
High efficiency nitrogen generator
A process and apparatus is disclosed for highly efficient nitrogen generator product in a single column arrangement. Oxygen-enriched liquid from a distillation column is partially vaporized to form a liquid and a vapor phase. The liquid is vaporized in a second reboiler/condenser and thereafter the vapor expanded to provide process refrigeration. The vapor portion having higher nitrogen content is compressed and returned to the distillation column for higher overall nitrogen recovery.
Numerous processes for the PSA nitrogen generator from air are known in the art. Where the primary product is nitrogen, single column processes for the separation of air at cryogenic conditions utilizing an oxygen-enriched stream for expansion and refrigeration for the process is well known.
One such basic process and apparatus for the generation of nitrogen using waste oxygen-enriched stream expansion is described in U.S. In this basic process, compressed dried feed air with impurities removed is cooled to near the dew point and fed to the lower part of a single distillation column wherein it is separated into a nitrogen-enriched stream at the top of the column and an oxygen-enriched stream at the bottom of the column.
Another modification of the basic single columnNitrogen generator for coal mine is disclosed in U.S. In this process, oxygen-enriched liquid is withdrawn from the bottom of the single distillation column and expanded into the reboiler/condenser to provide for condensation of nitrogen-enriched vapors which in turn are returned as reflux to the top of the distillation column.
The present nitrogen generator provides for a process carried out under cryogenic conditions in an PSA oxygen generator providing for an efficient recovery of nitrogen from air. In the process of the present invention, a gaseous feed stream is rendered free of impurities, compressed, dried, and cooled, and thereafter, delivered to a feed point in a distillation column. In the distillation column, a nitrogen-enriched vapor is formed at the top, and an oxygen-enriched liquid at the bottom of the column.
A process and apparatus is disclosed for highly efficient nitrogen generator product in a single column arrangement. Oxygen-enriched liquid from a distillation column is partially vaporized to form a liquid and a vapor phase. The liquid is vaporized in a second reboiler/condenser and thereafter the vapor expanded to provide process refrigeration. The vapor portion having higher nitrogen content is compressed and returned to the distillation column for higher overall nitrogen recovery.
Numerous processes for the PSA nitrogen generator from air are known in the art. Where the primary product is nitrogen, single column processes for the separation of air at cryogenic conditions utilizing an oxygen-enriched stream for expansion and refrigeration for the process is well known.
One such basic process and apparatus for the generation of nitrogen using waste oxygen-enriched stream expansion is described in U.S. In this basic process, compressed dried feed air with impurities removed is cooled to near the dew point and fed to the lower part of a single distillation column wherein it is separated into a nitrogen-enriched stream at the top of the column and an oxygen-enriched stream at the bottom of the column.
Another modification of the basic single columnNitrogen generator for coal mine is disclosed in U.S. In this process, oxygen-enriched liquid is withdrawn from the bottom of the single distillation column and expanded into the reboiler/condenser to provide for condensation of nitrogen-enriched vapors which in turn are returned as reflux to the top of the distillation column.
The present nitrogen generator provides for a process carried out under cryogenic conditions in an PSA oxygen generator providing for an efficient recovery of nitrogen from air. In the process of the present invention, a gaseous feed stream is rendered free of impurities, compressed, dried, and cooled, and thereafter, delivered to a feed point in a distillation column. In the distillation column, a nitrogen-enriched vapor is formed at the top, and an oxygen-enriched liquid at the bottom of the column.