Title:
窒素同位体濃縮方法
Document Type and Number:
Japanese Patent JP5425384
Kind Code:
B2
Abstract:
The present invention provides a method for concentrating nitrogen isotope comprising a step for obtaining a final product nitrogen, in which the stable nitrogen isotope, 15 N, has been concentrated, by low-temperature distillation of raw material nitrogen containing trace amounts of oxygen and argon with a plurality of distillation columns composed in a cascade arrangement, wherein together with discharging an argon-oxygen mixture from the bottom of the final column and extracting a 15 N-concentrated nitrogen fluid from a lower intermediate point of the final column, the flow rate of the argon-oxygen mixture discharged from the bottom of the final column is controlled based on the reading of a thermometer installed below the point where the final product 15 N-concentrated nitrogen is extracted, thereby enabling the final product nitrogen to be stably obtained.
More Like This:
| JP2000274937 | LOW TEMPERATURE DISTILLATION COLUMN |
| WO/2013/146466 | DISTILLATION DEVICE |
Inventors:
Hitoshi Kihara
Application Number:
JP2007242987A
Publication Date:
February 26, 2014
Filing Date:
September 19, 2007
Export Citation:
Assignee:
Taiyo Nippon Sanso Co., Ltd.
International Classes:
B01D59/04; F25J3/04
Domestic Patent References:
| JP2003221210A |
Foreign References:
| WO2007122893A1 |
Attorney, Agent or Firm:
Masatake Shiga
Tadashi Takahashi
Takashi Watanabe
Suzuki Mitsuyoshi
Kazuya Nishi
Yasuhiko Murayama
Tadashi Takahashi
Takashi Watanabe
Suzuki Mitsuyoshi
Kazuya Nishi
Yasuhiko Murayama