CA2048146A1 - Production of nitrogen free of light impurities - Google Patents
Production of nitrogen free of light impuritiesInfo
- Publication number
- CA2048146A1 CA2048146A1 CA 2048146 CA2048146A CA2048146A1 CA 2048146 A1 CA2048146 A1 CA 2048146A1 CA 2048146 CA2048146 CA 2048146 CA 2048146 A CA2048146 A CA 2048146A CA 2048146 A1 CA2048146 A1 CA 2048146A1
- Authority
- CA
- Canada
- Prior art keywords
- nitrogen
- pressure column
- rich
- purge
- high purity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title abstract 20
- 229910052757 nitrogen Inorganic materials 0.000 title abstract 10
- 239000012535 impurity Substances 0.000 title abstract 4
- 238000010926 purge Methods 0.000 abstract 3
- 238000000926 separation method Methods 0.000 abstract 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 abstract 2
- 238000004821 distillation Methods 0.000 abstract 2
- 229910052786 argon Inorganic materials 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 1
- 239000000356 contaminant Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000001301 oxygen Substances 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 238000011027 product recovery Methods 0.000 abstract 1
- 238000010992 reflux Methods 0.000 abstract 1
Landscapes
- Separation By Low-Temperature Treatments (AREA)
Abstract
ABSTRACT
This invention relates to a cryogenic process for the separation of air utilizing an integrated multi-column distillation system wherein an ultra high purity nitrogen rich, oxygen rich and optionally an argon rich product are generated. In the cryogenic distillation separation of air, air is initially compressed, pretreated and cooled for separation into its components. Ultra high purity, e.g., nitrogen having less than 0.1 ppm of volatile impurities is generated with enhanced nitrogen product recovery by withdrawing liquid nitrogen from the higher pressure column at an intermediate point and charging that fraction as reflux to the lower pressure column, withdrawing a nitrogen stream which is rich in volatile contaminants from the top of the high pressure column, partially condensing the nitrogen stream and removing the uncondensed portion as a purge stream, and, withdrawing an ultra high purity nitrogen product at a point below a nitrogen vapor withdrawal point at the top of the lower pressure column. Alternatively, no purge need be taken and the volatile impurities allowed to pass to the low pressure column. In that case, a nitrogen fraction rich in volatile impurities is removed from an upper portion of the low pressure column, condensed and at least a portion of the uncondensed fraction removed as a purge and the condensed portion returned to the low pressure column.
This invention relates to a cryogenic process for the separation of air utilizing an integrated multi-column distillation system wherein an ultra high purity nitrogen rich, oxygen rich and optionally an argon rich product are generated. In the cryogenic distillation separation of air, air is initially compressed, pretreated and cooled for separation into its components. Ultra high purity, e.g., nitrogen having less than 0.1 ppm of volatile impurities is generated with enhanced nitrogen product recovery by withdrawing liquid nitrogen from the higher pressure column at an intermediate point and charging that fraction as reflux to the lower pressure column, withdrawing a nitrogen stream which is rich in volatile contaminants from the top of the high pressure column, partially condensing the nitrogen stream and removing the uncondensed portion as a purge stream, and, withdrawing an ultra high purity nitrogen product at a point below a nitrogen vapor withdrawal point at the top of the lower pressure column. Alternatively, no purge need be taken and the volatile impurities allowed to pass to the low pressure column. In that case, a nitrogen fraction rich in volatile impurities is removed from an upper portion of the low pressure column, condensed and at least a portion of the uncondensed fraction removed as a purge and the condensed portion returned to the low pressure column.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US56287890A | 1990-08-06 | 1990-08-06 | |
| US07/562,878 | 1990-08-06 | ||
| US07/633,826 US5137559A (en) | 1990-08-06 | 1990-12-26 | Production of nitrogen free of light impurities |
| US07/633826 | 1990-12-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2048146A1 true CA2048146A1 (en) | 1992-02-07 |
| CA2048146C CA2048146C (en) | 1994-05-17 |
Family
ID=27073098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002048146A Expired - Fee Related CA2048146C (en) | 1990-08-06 | 1991-07-30 | Production of nitrogen free of light impurities |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2656403B2 (en) |
| CA (1) | CA2048146C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3306517B2 (en) * | 1992-05-08 | 2002-07-24 | 日本酸素株式会社 | Air liquefaction separation apparatus and method |
| JP6440232B1 (en) * | 2018-03-20 | 2018-12-19 | レール・リキード−ソシエテ・アノニム・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード | Product nitrogen gas and product argon production method and production apparatus thereof |
| JP6557763B1 (en) * | 2018-08-09 | 2019-08-07 | レール・リキード−ソシエテ・アノニム・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード | Air separation device |
-
1991
- 1991-07-30 CA CA002048146A patent/CA2048146C/en not_active Expired - Fee Related
- 1991-08-01 JP JP21587391A patent/JP2656403B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2656403B2 (en) | 1997-09-24 |
| CA2048146C (en) | 1994-05-17 |
| JPH04227462A (en) | 1992-08-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 19950131 |