Organic compounds -- part of the class 532-570 series – Organic compounds – Four or more ring nitrogens in the bicyclo ring system
Reexamination Certificate
2006-12-26
2006-12-26
Balasubramanian, Venkataraman (Department: 1624)
Organic compounds -- part of the class 532-570 series
Organic compounds
Four or more ring nitrogens in the bicyclo ring system
C544S201000
Reexamination Certificate
active
07153962
ABSTRACT:
Process for cooling and crystallizing solid melamine from the gaseous phase or from melamine melts as they develop in technical processes used to produce melamine, characterized in that the melamine-containing process gases or melamine melts are introduced into liquid, organic phase at high pressure, said phase comprising polyvalent alcohols such as ethylene glycol, glycerine or their homologous series or of amines such as ethanol amines or a mixture of both groups. The advantage this process is that the hot melamine is cooled very quickly without forming thermal decomposition products and that during quenching no reaction of the melamine with the solvent occurs, the formation of higher deammoniation products such as melam and melem is prevented and higher deammoniation products of the melamine such as melam and melem, are partially converted back into melamine.
REFERENCES:
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patent: 5514796 (1996-05-01), Best et al.
patent: 1 035 117 (2000-09-01), None
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Ullmann's Encyclopedia of Industrial Chemistry, vol. A 16, 5th Edition pp. 171-185 (1990).
Akerman & Senterfitt
Balasubramanian Venkataraman
Casale Chemicals S.A.
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