GB974145A - Method for the preparation of cyanic acid vapour from urea - Google Patents
Method for the preparation of cyanic acid vapour from ureaInfo
- Publication number
- GB974145A GB974145A GB2892262A GB2892262A GB974145A GB 974145 A GB974145 A GB 974145A GB 2892262 A GB2892262 A GB 2892262A GB 2892262 A GB2892262 A GB 2892262A GB 974145 A GB974145 A GB 974145A
- Authority
- GB
- United Kingdom
- Prior art keywords
- urea
- ammonia
- cyanic acid
- gas
- preparation
- 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
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C3/00—Cyanogen; Compounds thereof
- C01C3/20—Thiocyanic acid; Salts thereof
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C3/00—Cyanogen; Compounds thereof
- C01C3/001—Preparation by decomposing nitrogen-containing organic compounds, e.g. molasse waste or urea
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Cyanic acid vapour is produced by heating urea within five seconds by vaporizing the urea in an exclusively or mainly indirectly heated bed of sand, fluidized by a stream of gas, at a temperature from 250 DEG to 400 DEG C. under substantially anhydrous conditions and either maintaining the mixture of cyanic acid and ammonia at above 170 DEG C. or chemically removing the ammonia. The ammonia may be removed by adding hydrogen chloride at above 170 DEG C. and separating the ammonium chloride as a solid after cooling. The fluidizing gas may be nitrogen or ammonia. The urea can be introduced either from above or from below by means of a gas.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT646361 | 1961-08-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB974145A true GB974145A (en) | 1964-11-04 |
Family
ID=3586560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2892262A Expired GB974145A (en) | 1961-08-22 | 1962-07-27 | Method for the preparation of cyanic acid vapour from urea |
Country Status (2)
Country | Link |
---|---|
CH (1) | CH416584A (en) |
GB (1) | GB974145A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3652209A (en) * | 1968-03-01 | 1972-03-28 | Oesterr Stickstoffwerke Ag | Process for the production of a cyanic acid-ammonia gas mixture |
EP0693484A1 (en) * | 1994-07-22 | 1996-01-24 | Chemie Linz GmbH | Process for the preparation of cyanuric acid by deposition from a gaseous isocyanic acid-ammonia mixture |
-
1962
- 1962-06-30 CH CH789862A patent/CH416584A/en unknown
- 1962-07-27 GB GB2892262A patent/GB974145A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3652209A (en) * | 1968-03-01 | 1972-03-28 | Oesterr Stickstoffwerke Ag | Process for the production of a cyanic acid-ammonia gas mixture |
EP0693484A1 (en) * | 1994-07-22 | 1996-01-24 | Chemie Linz GmbH | Process for the preparation of cyanuric acid by deposition from a gaseous isocyanic acid-ammonia mixture |
Also Published As
Publication number | Publication date |
---|---|
CH416584A (en) | 1966-07-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1078769A (en) | Process for regenerating used pickling liquor which contains hydrochloric acid | |
GB799876A (en) | Method of preparing pure silicon | |
ZA827441B (en) | Method and apparatus for regulating the nh3 content in scrubbing liquid used in a gas scrubbing process | |
GB1004524A (en) | Process for the recovery of ammonia and sulphur dioxide | |
GB1106024A (en) | Urea synthesis | |
GB853220A (en) | Process and apparatus for the preparation of urea from ammonia and carbon dioxide | |
GB974145A (en) | Method for the preparation of cyanic acid vapour from urea | |
GB753342A (en) | Improvements in or relating to urea purification | |
GB945783A (en) | Process for the purification of urea | |
GB1348937A (en) | Processing of coke oven gas | |
GB960039A (en) | Urea synthesis process | |
GB963478A (en) | recovery of acrylonitrile | |
GB1003278A (en) | A process for separating melamine from waste gas | |
GB1024057A (en) | Method of producing cyanic acid from urea | |
ES389828A1 (en) | Process for separating melamine from a hot synthesis gas mixture which contains melamine vapor | |
GB1003277A (en) | Process and apparatus for the production and separation of melamine | |
GB951924A (en) | Process for the preparation of carbamyl chloride | |
GB908609A (en) | Improvements in or relating to the production of nitrogenous vapour mixtures | |
FR2075207A5 (en) | Ammonium bisulphate - by thermal decomposition of ammonium sulphate | |
ES364270A1 (en) | Process for the production of a cyanic acid-ammonia gas mixture | |
GB1137037A (en) | Process for the extraction and the concentration of hydrogen fluoride | |
GB959358A (en) | Production of urea prills of low biuret content | |
ES462561A1 (en) | Method of preparing cyanuric acid | |
GB1012819A (en) | Process for separating melamine from hot, melamine-containing gas mixtures | |
ES282992A1 (en) | Procedure to recover melamine (Machine-translation by Google Translate, not legally binding) |