FR2378021A1 - Procede de preparation de melamine - Google Patents

Procede de preparation de melamine

Info

Publication number
FR2378021A1
FR2378021A1 FR7801490A FR7801490A FR2378021A1 FR 2378021 A1 FR2378021 A1 FR 2378021A1 FR 7801490 A FR7801490 A FR 7801490A FR 7801490 A FR7801490 A FR 7801490A FR 2378021 A1 FR2378021 A1 FR 2378021A1
Authority
FR
France
Prior art keywords
melamine
urea
temperature
catalyst
degrees
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7801490A
Other languages
English (en)
Other versions
FR2378021B1 (fr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stamicarbon BV
Original Assignee
Stamicarbon BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from NLAANVRAGE7700509,A external-priority patent/NL184318C/xx
Priority claimed from NL7700553A external-priority patent/NL184319C/xx
Application filed by Stamicarbon BV filed Critical Stamicarbon BV
Publication of FR2378021A1 publication Critical patent/FR2378021A1/fr
Application granted granted Critical
Publication of FR2378021B1 publication Critical patent/FR2378021B1/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
    • B01J8/26—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with two or more fluidised beds, e.g. reactor and regeneration installations
    • B01J8/28—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with two or more fluidised beds, e.g. reactor and regeneration installations the one above the other
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
    • C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
    • C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
    • C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
    • C07D251/40—Nitrogen atoms
    • C07D251/54—Three nitrogen atoms
    • C07D251/56—Preparation of melamine
    • C07D251/60—Preparation of melamine from urea or from carbon dioxide and ammonia

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)

Abstract

L'invention concerne la préparation de mélamine. La mélamine s'obtient par mise en oeuvre d'un chauffage d'urée ou de produits de décomposition thermique de l'uree dans un lit fluidisé d'une matière catalytiquement active, en présence d'ammoniac ou d'un mélange de gaz contenant de l'ammoniac, à une pression de 100 à 2 500 kPa, dans un réacteur subdivisé en au moins deux zones, caractérisé en ce que l'on réalise la réaction dans un réacteur pourvu d'un crible ou d'un organe équivalent qui divise le lit de catalyseur en une zone inférieure dans laquelle on introduit de l'urée et/ou des produits de décomposition thermique de l'urée pour y être convertis en mélamine et dans laquelle on maintient une température qui varie de 325 degrés C à 425 degrés C et en une zone supérieure dans laquelle la température est égale ou supérieure à la température qui règne dans la zone inférieure, le crible ou l'organe équivalent admettant un flux de catalyseur qui représente de 5 à 75 % du flux de catalyseur passant par une surface ouverte correspondante sans crible. Ce procédé donne un rendement extrêmement élevé en mélamine.
FR7801490A 1977-01-19 1978-01-19 Procede de preparation de melamine Granted FR2378021A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NLAANVRAGE7700509,A NL184318C (nl) 1977-01-19 1977-01-19 Werkwijze voor het bereiden van melamine.
NL7700553A NL184319C (nl) 1977-01-20 1977-01-20 Bereiding van melamine uit ureum.

Publications (2)

Publication Number Publication Date
FR2378021A1 true FR2378021A1 (fr) 1978-08-18
FR2378021B1 FR2378021B1 (fr) 1983-08-26

Family

ID=26645276

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7801490A Granted FR2378021A1 (fr) 1977-01-19 1978-01-19 Procede de preparation de melamine

Country Status (23)

Country Link
US (1) US4156080A (fr)
JP (1) JPS5390279A (fr)
AR (1) AR220116A1 (fr)
AT (1) AT359512B (fr)
BG (1) BG31650A3 (fr)
BR (1) BR7800294A (fr)
CA (1) CA1085393A (fr)
CS (1) CS202004B2 (fr)
DD (1) DD133666A5 (fr)
DE (1) DE2802238A1 (fr)
EG (1) EG12834A (fr)
ES (1) ES466103A1 (fr)
FR (1) FR2378021A1 (fr)
GB (1) GB1560527A (fr)
HU (1) HU180934B (fr)
IN (1) IN146260B (fr)
IT (1) IT1103254B (fr)
MX (1) MX5805E (fr)
NO (1) NO154347C (fr)
PL (1) PL116547B1 (fr)
RO (1) RO74590A (fr)
SE (1) SE438148B (fr)
YU (1) YU40025B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0612560A1 (fr) * 1993-02-22 1994-08-31 Wladimiro Bizzotto Réacteur sous haute pression pour la production de mélamine

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7903473A (nl) * 1979-05-03 1980-11-05 Stamicarbon Werkwijze voor het bereiden van melamine.
NL8001874A (nl) * 1980-03-29 1981-11-02 Stamicarbon Inrichting voor het versproeien van een vloeistof met behulp van een gas.
NL8201479A (nl) * 1982-04-07 1983-11-01 Stamicarbon Werkwijze voor het bereiden van melamine.
US5384404A (en) * 1993-11-05 1995-01-24 Lee; Jing M. Process for manufacturing melamine from urea
NL1012466C2 (nl) * 1999-06-29 2001-01-02 Dsm Nv Werkwijze voor de bereiding van melamine uit ureum.
NL1022414C2 (nl) * 2003-01-17 2004-07-20 Dsm Nv Werkwijze voor het onttrekken van energie uit rookgassen.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3332947A (en) * 1965-09-14 1967-07-25 American Cyanamid Co Production of melamine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3158611A (en) * 1964-11-24 Converting urea to melamine in the gas phase over
US3152128A (en) * 1964-10-06 Preparation of melamine
US3095416A (en) * 1963-06-25 Urea to melamine process
DE1209570B (de) * 1964-03-28 1966-01-27 Basf Ag Verfahren zur Herstellung von Melamin
US3723430A (en) * 1970-10-28 1973-03-27 Nissan Chemical Ind Ltd Method for reclamation of melamine waste gas
US3895007A (en) * 1972-04-28 1975-07-15 Basf Ag Manufacture of melamine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3332947A (en) * 1965-09-14 1967-07-25 American Cyanamid Co Production of melamine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0612560A1 (fr) * 1993-02-22 1994-08-31 Wladimiro Bizzotto Réacteur sous haute pression pour la production de mélamine
US5486339A (en) * 1993-02-22 1996-01-23 Bizzotto; Wladimiro High-pressure melamine reactor

Also Published As

Publication number Publication date
GB1560527A (en) 1980-02-06
NO154347C (no) 1986-09-03
DD133666A5 (de) 1979-01-17
IT7847689A0 (it) 1978-01-18
JPS5390279A (en) 1978-08-08
BG31650A3 (en) 1982-02-15
DE2802238C2 (fr) 1989-02-23
BR7800294A (pt) 1978-09-05
IT1103254B (it) 1985-10-14
SE438148B (sv) 1985-04-01
YU8778A (en) 1982-10-31
ATA19878A (de) 1980-04-15
YU40025B (en) 1985-06-30
US4156080A (en) 1979-05-22
SE7800613L (sv) 1978-07-20
FR2378021B1 (fr) 1983-08-26
DE2802238A1 (de) 1978-07-20
EG12834A (en) 1979-12-31
AR220116A1 (es) 1980-10-15
AT359512B (de) 1980-11-10
CA1085393A (fr) 1980-09-09
NO154347B (no) 1986-05-26
PL116547B1 (en) 1981-06-30
CS202004B2 (en) 1980-12-31
ES466103A1 (es) 1978-10-01
PL204064A1 (pl) 1979-06-04
IN146260B (fr) 1979-04-07
NO780190L (no) 1978-07-20
HU180934B (en) 1983-05-30
MX5805E (es) 1984-07-26
RO74590A (fr) 1981-08-30

Similar Documents

Publication Publication Date Title
FR2452964A1 (fr) Procede et appareil pour faire reagir des matieres premieres gazeuses par contact avec un catalyseur, notamment pour la preparation de l'ammoniac et du methanol
US2398954A (en) Process and apparatus for promoting thermal reactions
FR2378021A1 (fr) Procede de preparation de melamine
US2916534A (en) Process for carrying out endothermic reactions at high temperatures
FR2388783A1 (fr) Procede de methanation mettant en oeuvre un catalyseur definissant un passage helicoidal pour les gaz
GB1357865A (en) Two-stage high temperature shift reactor
FR2391192A1 (fr) Procede de preparation catalytique de l'acrylonitrile
US2861873A (en) Apparatus for effecting catalytic exothermic reactions
ES8306103A1 (es) "un procedimiento mejorado para la preparacion de urea".
FR2427318A1 (fr) Procede pour la production de methanol
US3056655A (en) Process for making hydrogen cyanide
ES8203950A1 (es) Perfeccionamientos en aparatos para chaquear una alimenta- cion de hidrocarburos
US3041150A (en) Apparatus for effecting catalytic exothermic reactions
FI913353A0 (fi) Foerfarande foer framstaellning av kiselkarbid.
GB1148513A (en) Improvements in or relating to the manufacture of ammonia
MY102724A (en) Device conceived as nh3, reactor
US2625463A (en) Method for producing hydrogen cyanide
ES395092A1 (es) Metodo para la preparacion de azufre y sulfuro de hidroge- no.
ES468692A1 (es) Un procedimiento para el tratamiento termico de solidos de granulado fino.
US2789126A (en) Vapor phase process for production of acrylonitrile
GB1032326A (en) A process for the production and separation of melamine
SU1194480A1 (ru) Способ охлаждени катализатора
FR2364962A1 (fr) Combustible gazeux et procede et appareil pour le produire a partir de matiere organique
FR2391228A1 (fr) Procede de preparation de polymeres d'olefines
GB986110A (en) Cooler

Legal Events

Date Code Title Description
TP Transmission of property
ST Notification of lapse