NL7700553A - Thermodynamically efficient urea conversion to melamine - uses reactor with fluidised catalyst bed divided into two zones sepd. by sieve plate - Google Patents

Thermodynamically efficient urea conversion to melamine - uses reactor with fluidised catalyst bed divided into two zones sepd. by sieve plate

Info

Publication number
NL7700553A
NL7700553A NL7700553A NL7700553A NL7700553A NL 7700553 A NL7700553 A NL 7700553A NL 7700553 A NL7700553 A NL 7700553A NL 7700553 A NL7700553 A NL 7700553A NL 7700553 A NL7700553 A NL 7700553A
Authority
NL
Netherlands
Prior art keywords
sieve plate
melamine
catalyst bed
sepd
zones
Prior art date
Application number
NL7700553A
Other languages
Dutch (nl)
Other versions
NL184319C (en
Original Assignee
Stamicarbon
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 to RO7392934A priority Critical patent/RO74590A/en
Application filed by Stamicarbon filed Critical Stamicarbon
Priority to NL7700553A priority patent/NL184319C/en
Priority to GB54344/77A priority patent/GB1560527A/en
Priority to IN20/DEL/78A priority patent/IN146260B/en
Priority to AT19878A priority patent/AT359512B/en
Priority to CA294,807A priority patent/CA1085393A/en
Priority to CS78287A priority patent/CS202004B2/en
Priority to HU78SA3088A priority patent/HU180934B/en
Priority to YU87/78A priority patent/YU40025B/en
Priority to AR270734A priority patent/AR220116A1/en
Priority to EG27/78A priority patent/EG12834A/en
Priority to IT47689/78A priority patent/IT1103254B/en
Priority to NO780190A priority patent/NO154347C/en
Priority to SE7611103A priority patent/SE438148B/en
Priority to PL1978204064A priority patent/PL116547B1/en
Priority to JP414278A priority patent/JPS5390279A/en
Priority to ES466103A priority patent/ES466103A1/en
Priority to BR7800294A priority patent/BR7800294A/en
Priority to MX786781U priority patent/MX5805E/en
Priority to FR7801490A priority patent/FR2378021A1/en
Priority to BG038435A priority patent/BG31650A3/en
Priority to DD7800203304A priority patent/DD133666A5/en
Priority to DE19782802238 priority patent/DE2802238A1/en
Priority to US05/871,110 priority patent/US4156080A/en
Publication of NL7700553A publication Critical patent/NL7700553A/en
Priority to NO831065A priority patent/NO159087C/en
Application granted granted Critical
Publication of NL184319C publication Critical patent/NL184319C/en

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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

In the prodn. of melamine, urea or its thermal decompsn. prods. are heated in a fluidised bed of a catalytically active material in the presence of ammonia or an NH3-contg. gas at 100-2500 kPa. The appts. has a sieve plate or similar fitting which divides the catalyst bed into a lower and an upper zone. In the lower zone, the urea is converted into melamine at 325-425 degrees C. The upper zone is maintained at a temp. of at least the temp. in the lower zone. The sieve plate allows a catalyst flux with it is 5-75% of the catalyst flux across a corresp. open surface without sieve plate. Process allows max. effective utilisation of the heat of reaction and gives theoretical yields of >95% theory. It is possible to approach or to achieve thermodynamic equilibrium for the process.
NL7700553A 1977-01-19 1977-01-20 PREPARATION OF MELAMINE FROM UREA. NL184319C (en)

Priority Applications (25)

Application Number Priority Date Filing Date Title
RO7392934A RO74590A (en) 1977-01-19 1973-01-17 PROCEDURE FOR PREPARING MELAMINE FROM URINE
NL7700553A NL184319C (en) 1977-01-20 1977-01-20 PREPARATION OF MELAMINE FROM UREA.
GB54344/77A GB1560527A (en) 1977-01-19 1977-12-30 Preparation of melamine from urea
IN20/DEL/78A IN146260B (en) 1977-01-19 1978-01-09
AT19878A AT359512B (en) 1977-01-19 1978-01-11 METHOD FOR PRODUCING MELAMINE
CA294,807A CA1085393A (en) 1977-01-19 1978-01-12 Process for the preparation of melamine
CS78287A CS202004B2 (en) 1977-01-19 1978-01-16 Method of producing melamine by heating of urea
HU78SA3088A HU180934B (en) 1977-01-19 1978-01-16 Reactor for preparing melamine from carbamide
AR270734A AR220116A1 (en) 1977-01-19 1978-01-17 PROCEDURE TO PREPARE MELAMINE FOR WARMING UP OF UREA OR THERMAL DECOMPOSITION PRODUCTS OF THIS MELAMINE OBTAINED AND A REACTOR TO PERFORM THE PROCEDURE
YU87/78A YU40025B (en) 1977-01-19 1978-01-17 Process for obtaining melamine by means of heating urea or thermic decomposition product thereof
SE7611103A SE438148B (en) 1977-01-19 1978-01-18 PROCEDURE FOR THE PREPARATION OF ULAMINE MELAMINE
NO780190A NO154347C (en) 1977-01-19 1978-01-18 PROCEDURE FOR THE PREPARATION OF MELAMIN.
EG27/78A EG12834A (en) 1977-01-19 1978-01-18 Process for preparing of melamine
PL1978204064A PL116547B1 (en) 1977-01-19 1978-01-18 Method of manufacture of melamine from urea and apparatus therefor
JP414278A JPS5390279A (en) 1977-01-19 1978-01-18 Process for preparing melamine from urea
ES466103A ES466103A1 (en) 1977-01-19 1978-01-18 Process for the preparation of melamine
BR7800294A BR7800294A (en) 1977-01-19 1978-01-18 PROCESS FOR PREPARING MELAMINE BY HEATING UREA OR THERMAL DECOMPOSITION PRODUCTS
MX786781U MX5805E (en) 1977-01-19 1978-01-18 IMPROVED PROCEDURE FOR THE PREPARATION OF MELAMINE FROM UREA
IT47689/78A IT1103254B (en) 1977-01-19 1978-01-18 PROCEDURE FOR THE PRODUCTION OF UREA MELAMINE
FR7801490A FR2378021A1 (en) 1977-01-19 1978-01-19 MELAMINE PREPARATION PROCESS
BG038435A BG31650A3 (en) 1977-01-19 1978-01-19 Method and apparatus for obtaining of melamine
DD7800203304A DD133666A5 (en) 1977-01-19 1978-01-19 METHOD FOR PRODUCING MELAMINE
DE19782802238 DE2802238A1 (en) 1977-01-19 1978-01-19 METHOD FOR THE PRODUCTION OF MELAMINE
US05/871,110 US4156080A (en) 1977-01-19 1978-01-19 Process for the preparation of melamine
NO831065A NO159087C (en) 1977-01-19 1983-03-24 PROCEDURE FOR THE PREPARATION OF MELAMIN.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7700553A NL184319C (en) 1977-01-20 1977-01-20 PREPARATION OF MELAMINE FROM UREA.

Publications (2)

Publication Number Publication Date
NL7700553A true NL7700553A (en) 1978-07-24
NL184319C NL184319C (en) 1989-06-16

Family

ID=19827808

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7700553A NL184319C (en) 1977-01-19 1977-01-20 PREPARATION OF MELAMINE FROM UREA.

Country Status (1)

Country Link
NL (1) NL184319C (en)

Also Published As

Publication number Publication date
NL184319C (en) 1989-06-16

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Legal Events

Date Code Title Description
BA A request for search or an international-type search has been filed
BB A search report has been drawn up
BC A request for examination has been filed
A85 Still pending on 85-01-01