GB1419645A - Production of strong nitric acid - Google Patents
Production of strong nitric acidInfo
- Publication number
- GB1419645A GB1419645A GB2312873A GB2312873A GB1419645A GB 1419645 A GB1419645 A GB 1419645A GB 2312873 A GB2312873 A GB 2312873A GB 2312873 A GB2312873 A GB 2312873A GB 1419645 A GB1419645 A GB 1419645A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hno
- concn
- pressure
- bottoms
- produce
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/24—Nitric oxide (NO)
- C01B21/26—Preparation by catalytic or non-catalytic oxidation of ammonia
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
1419645 Strong nitric acid E I DU PONT DE NEMOURS & CO 15 May 1973 23128/73 Heading C1A HNO 3 of concn. of at least 90% by wt., e.g. up to 100%, is prepared by continuously (a) absorbing gaseous an equilibrium NO 2 /N 2 O 4 mixture in aq. HNO 3 to form 75-85% by wt. HNO 3 , (b) reacting the HNO 3 with O 2 and H 2 O at elevated pressure to form 80-90% by wt. HNO 3 , (c) vaporizing part of the N 2 O 4 and then (d) distilling the acid to produce the strong acid. Step (a) may be carried out at a pressure of 80-120 p.s.i.g. and a temp. of 0-25‹ C. to produce the 75-85% HNO 3 containing 15-30% dissolved N 2 O 4 . Step (b) may be performed at a pressure of 300-1600 p.s.i.g. and a temp. of 40-100‹ C. The vaporization step (c) may be by depressurization to 105-155 p.s.i.g. or by bleaching with air, thereby removing 50% of the N 2 O 4 . The distillation step (d) may be operated at atm. pressure. The N 2 O 4 -containing gaseous effluent from step (a) may be scrubbed in weak HNO 3 or water to produce a weak HNO 3 which on distillation gives a distillate of concn. less than 5% HNO 3 and bottoms of concn. 55-68À5% HNO 3 , the bottoms being used as an H 2 O source in step (b). The N 2 O 4 may be obtained by the catalytic oxidation of NH 3 and oxidation of the NO formed. The cooled and separated H 2 O from the catalytic oxidation having a concn. of 35-55% HNO 3 may be distilled to give distillate of concn. <5% HNO 3 and bottoms of concn. 55-68%, one or both fractions being used as a source of H 2 O for step (b).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2312873A GB1419645A (en) | 1973-05-15 | 1973-05-15 | Production of strong nitric acid |
FR7321022A FR2232509B1 (en) | 1973-05-15 | 1973-06-08 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2312873A GB1419645A (en) | 1973-05-15 | 1973-05-15 | Production of strong nitric acid |
FR7321022A FR2232509B1 (en) | 1973-05-15 | 1973-06-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1419645A true GB1419645A (en) | 1975-12-31 |
Family
ID=26217763
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2312873A Expired GB1419645A (en) | 1973-05-15 | 1973-05-15 | Production of strong nitric acid |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR2232509B1 (en) |
GB (1) | GB1419645A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0384565A1 (en) * | 1989-01-26 | 1990-08-29 | Beco Engineering Company | Treatment of nitrogen oxides |
CN113683067A (en) * | 2021-08-17 | 2021-11-23 | 韩玉芹 | System is prepared to industry nitric acid |
CN115477287A (en) * | 2022-10-17 | 2022-12-16 | 中核四0四有限公司 | Nitric acid recovery system and method in uranium purification process |
-
1973
- 1973-05-15 GB GB2312873A patent/GB1419645A/en not_active Expired
- 1973-06-08 FR FR7321022A patent/FR2232509B1/fr not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0384565A1 (en) * | 1989-01-26 | 1990-08-29 | Beco Engineering Company | Treatment of nitrogen oxides |
CN113683067A (en) * | 2021-08-17 | 2021-11-23 | 韩玉芹 | System is prepared to industry nitric acid |
CN115477287A (en) * | 2022-10-17 | 2022-12-16 | 中核四0四有限公司 | Nitric acid recovery system and method in uranium purification process |
CN115477287B (en) * | 2022-10-17 | 2023-09-26 | 中核四0四有限公司 | Nitric acid recovery system and method in uranium purification process |
Also Published As
Publication number | Publication date |
---|---|
FR2232509A1 (en) | 1975-01-03 |
FR2232509B1 (en) | 1979-09-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |