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1. (WO1992009585) PROCESS FOR THE PREPARATION OF MELAMINE FROM UREA
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1992/009585 International Application No.: PCT/NL1991/000240
Publication Date: 11.06.1992 International Filing Date: 28.11.1991
Chapter 2 Demand Filed: 25.06.1992
IPC:
C07D 251/60 (2006.01) ,C07D 251/62 (2006.01)
C CHEMISTRY; METALLURGY
07
ORGANIC CHEMISTRY
D
HETEROCYCLIC COMPOUNDS
251
Heterocyclic compounds containing 1,3,5-triazine rings
02
not condensed with other rings
12
having three double bonds between ring members or between ring members and non-ring members
26
with only hetero atoms directly attached to ring carbon atoms
40
Nitrogen atoms
54
Three nitrogen atoms
56
Preparation of melamine
60
from urea or from carbon dioxide and ammonia
C CHEMISTRY; METALLURGY
07
ORGANIC CHEMISTRY
D
HETEROCYCLIC COMPOUNDS
251
Heterocyclic compounds containing 1,3,5-triazine rings
02
not condensed with other rings
12
having three double bonds between ring members or between ring members and non-ring members
26
with only hetero atoms directly attached to ring carbon atoms
40
Nitrogen atoms
54
Three nitrogen atoms
62
Purification of melamine
Applicants:
DSM N.V. [NL/NL]; Het Overloon 1 NL-6411 TE Heerlen, NL (AllExceptUS)
VAN DE MOESDIJK, Cornelis, Gerardus, Maria [NL/NL]; NL (UsOnly)
JANSSEN, Hendrik, Jan [NL/NL]; NL (UsOnly)
SCHROIJEN, Josephus, Cornelus [NL/NL]; NL (UsOnly)
Inventors:
VAN DE MOESDIJK, Cornelis, Gerardus, Maria; NL
JANSSEN, Hendrik, Jan; NL
SCHROIJEN, Josephus, Cornelus; NL
Agent:
ALFENAAR, Marinus; Octrooibureau DSM P.O. Box 9 NL-6160 MA Geleen, NL
Priority Data:
900260629.11.1990NL
Title (EN) PROCESS FOR THE PREPARATION OF MELAMINE FROM UREA
(FR) PROCEDE DE PREPARATION DE MELAMINE A PARTIR D'UREE
Abstract:
(EN) The invention relates to a selective removal of impurities from the gas stream leaving a melamine synthesis reactor in the preparation of melamine from urea by means of a treatment with steam at elevated temperature in the presence of a catalyst which is shape-selective. For instance a molecular sieve is chosen.
(FR) Cette invention concerne l'élimination sélective des impuretés présentes dans un flux de gaz lorsqu'il sort d'un réacteur de synthèse de mélamine utilisé dans la préparation de mélamine à partir d'urée effectuée à l'aide d'un traitement par la vapeur dans des conditions de température élevée, en présence d'un catalyseur qui agit en fonction de la forme. On utilise par exemple un tamis moléculaire.
Designated States: AU, BB, BG, BR, CA, CS, FI, HU, JP, KP, KR, LK, MC, MG, MW, NO, PL, RO, SD, SU, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
FI932462NO19931959EP0559817RU02113435US5350849JP3117710
JPH06504040CA2097177DE000069119433AU1991089445BG61945