VERFAHREN ZUR HERSTELLUNG VON CYANURSÄURE
The prodn. of cyanuric acid (I) comprises cooling a gaseous mixt. of isocyanic acid (II) and ammonia from 300-480 degrees C to 200-300 degrees C, precipitating and isolating (I) by trimerisation of (II) at this temp. in a system designed for separating solids from gases, and recycling or reprocessin...
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| Main Authors | , , |
|---|---|
| Format | Patent |
| Language | German |
| Published |
25.02.1998
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| Edition | 6 |
| Subjects | |
| Online Access | Get full text |
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| Abstract | The prodn. of cyanuric acid (I) comprises cooling a gaseous mixt. of isocyanic acid (II) and ammonia from 300-480 degrees C to 200-300 degrees C, precipitating and isolating (I) by trimerisation of (II) at this temp. in a system designed for separating solids from gases, and recycling or reprocessing the unreacted gas mixt. Also claimed is prepn. of (I) coupled with a process for the prodn. of melamine by decomposition of urea. Pref. the starting gas mixt. contains 1-50 (pref. 3-30) vol% (II), and is obtd. by thermal decomposition of urea. (I) is pptd. at 230-280 degrees C, pref. in a hot gas filter, esp. a cyclone-type, tangentially fed hot gas filter with central filter inserts, pref. after cooling in a gas mixing chamber with the aid of cooling gas introduced through one or more further inlets. |
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| AbstractList | The prodn. of cyanuric acid (I) comprises cooling a gaseous mixt. of isocyanic acid (II) and ammonia from 300-480 degrees C to 200-300 degrees C, precipitating and isolating (I) by trimerisation of (II) at this temp. in a system designed for separating solids from gases, and recycling or reprocessing the unreacted gas mixt. Also claimed is prepn. of (I) coupled with a process for the prodn. of melamine by decomposition of urea. Pref. the starting gas mixt. contains 1-50 (pref. 3-30) vol% (II), and is obtd. by thermal decomposition of urea. (I) is pptd. at 230-280 degrees C, pref. in a hot gas filter, esp. a cyclone-type, tangentially fed hot gas filter with central filter inserts, pref. after cooling in a gas mixing chamber with the aid of cooling gas introduced through one or more further inlets. |
| Author | SCHULZ ERICH MUELLNER MARTIN DR HAEUBL GEORG DR |
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| Notes | Application Number: AT145494 |
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| PublicationDate | 19980225 |
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| Snippet | The prodn. of cyanuric acid (I) comprises cooling a gaseous mixt. of isocyanic acid (II) and ammonia from 300-480 degrees C to 200-300 degrees C, precipitating... |
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| Title | VERFAHREN ZUR HERSTELLUNG VON CYANURSÄURE |
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