Process for the production of melamine

Details Process for the production of melamine Process for the production of melamine

2006-04-04

2006-04-04

O'Sullivan, Peter G. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

C422S200000, C422S201000, C544S203000

Reexamination Certificate

active

07022848

ABSTRACT:
A process for the production of melamine by pyrolysis of urea in a high-pressure reactor having a vertical central pipe is provided. The melamine flows upwards into the reactor from below, mixes in the lower part of the reactor with a urea melt, and optionally NH3, introduced into the reactor from below, and emerges from the central pipe in the upper part of the central pipe. Part of the melamine formed flows downward in the annular space between the central pipe and reactor wall, and the remainder is expelled for further work-up. The off-gases are removed at the top of the reactor. A reactor for carrying out the process is also provided.

REFERENCES:
patent: 3116294 (1963-12-01), Marullo et al.
patent: 5486339 (1996-01-01), Bizzotto
patent: 1 228 266 (1966-11-01), None
patent: 0 612 560 (1994-08-01), None
patent: 0 808 836 (1997-11-01), None
patent: WO 95/01345 (1995-01-01), None
patent: WO 99/00374 (1999-01-01), None
International Search Report of corresponding International Application No. PCT/EP/01/11890, dated Feb. 19, 2002.
International Preliminary Examination Report of corresponding International Application No. PCT/EP/01/11890, dated Apr. 17, 2002, with English translation.

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