C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/249.6
C07D 251/58 (2006.01)
Patent
CA 1055940
ABSTRACT OF THE DISCLOSURE The invention related to a process for the preparation of melamine of high purity and in high yield from cyanamide and/or dicyandiamide at approximately atmospheric pressure The reaction in at least one solvent of the general formula: Image or Image wherein R1 and R2 represent alkyl groups, which can be identical or different and together can also form a ring is performed in the simultaneous presence of alkali hyd- roxide or alkaline earth hydroxide. Dimethylsulfoxide is preferred as the organic solvent, and potassium hyd- roxide or sodium hydroxide is preferred as the alkali hyd- roxide. The yields which can be achieved in the trans- formation of cyanamide and/or dicyandiamide in the above- specified system of organic solvent plus alkali hydroxide or alkaline earth hydroxide amount to as much as 97% of a melamine of a purity exceeding 99.5%. The melamine thus obtained can, after separation of the solvent, be used without further purifying operations for such processes as the condensation reaction with formaldehyde. The total melamine yield amounts, in the continuously performed method, to more than 98% with respect to the cyanamide or dicyan- diamide starting substances.
265048
Michaud Horst
Ortenburger Gunter
Poschinger Wilhelm
Rock Heinrich
Seeholzer Josef
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