GB957362A - Improvements in or relating to processes for the production of melamine - Google Patents

Improvements in or relating to processes for the production of melamine

Info

Publication number
GB957362A
GB957362A GB1647962A GB1647962A GB957362A GB 957362 A GB957362 A GB 957362A GB 1647962 A GB1647962 A GB 1647962A GB 1647962 A GB1647962 A GB 1647962A GB 957362 A GB957362 A GB 957362A
Authority
GB
United Kingdom
Prior art keywords
urea
reaction
conductive
carbon
graphite
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.)
Expired
Application number
GB1647962A
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.)
Hibernia Chemie GmbH
Original Assignee
Hibernia Chemie GmbH
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 DEH42542A external-priority patent/DE1193058B/en
Application filed by Hibernia Chemie GmbH filed Critical Hibernia Chemie GmbH
Publication of GB957362A publication Critical patent/GB957362A/en
Expired 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
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/0006—Controlling or regulating processes
    • B01J19/0013—Controlling the temperature of the process
    • 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
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/02—Apparatus characterised by being constructed of material selected for its chemically-resistant properties
    • 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
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/04—Pressure vessels, e.g. autoclaves
    • 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
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008—Controlling the process
    • B01J2208/00017—Controlling the temperature
    • B01J2208/00389—Controlling the temperature using electric heating or cooling elements
    • B01J2208/00398—Controlling the temperature using electric heating or cooling elements inside the reactor bed
    • 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
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00051—Controlling the temperature
    • B01J2219/00132—Controlling the temperature using electric heating or cooling elements
    • 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
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/02—Apparatus characterised by their chemically-resistant properties
    • B01J2219/0204—Apparatus characterised by their chemically-resistant properties comprising coatings on the surfaces in direct contact with the reactive components
    • B01J2219/0227—Apparatus characterised by their chemically-resistant properties comprising coatings on the surfaces in direct contact with the reactive components of graphite
    • 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
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/18—Details relating to the spatial orientation of the reactor
    • B01J2219/185—Details relating to the spatial orientation of the reactor vertical

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Catalysts (AREA)

Abstract

Melamine is produced by heating urea under pressure in a vessel lined with non-metallic materials, using an electrical heating element of a conductive, non-metallic and corrosion resistant material (other than urea itself) in the interior of the reaction vessel. A pile or uniform structure of conductive material may be used, which can be permeated with non-conductive or less conductive material to provide a rising or falling conductivity characteristic in the direction of flow of the urea. The reaction is performed so that liquid urea flows countercurrent to the gas phase produced. This gaseous phase, consisting of ammonia and carbon dioxide may be cooled without pressure change and converted into urea and then recycled. An A.C. current is preferably used and the heating element may be made of carbon, silicon carbide, or graphite. The reactor lining may be of carbon or graphite, if it is to be used as an electrode, or it may be of e.g. kaolin, corundum, or magnasite. A catalyst may be used for the reaction which may be a metal, or metal oxide or salt (see Specification 754,720).
GB1647962A 1961-05-09 1962-04-30 Improvements in or relating to processes for the production of melamine Expired GB957362A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH42542A DE1193058B (en) 1961-05-09 1961-05-09 Device for the production of melamine with pressure-bearing walls

Publications (1)

Publication Number Publication Date
GB957362A true GB957362A (en) 1964-05-06

Family

ID=7154898

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1647962A Expired GB957362A (en) 1961-05-09 1962-04-30 Improvements in or relating to processes for the production of melamine

Country Status (5)

Country Link
BE (1) BE617424A (en)
CH (1) CH401984A (en)
FR (1) FR1326643A (en)
GB (1) GB957362A (en)
LU (1) LU41661A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3455659A (en) * 1967-09-06 1969-07-15 American Cyanamid Co Superheating ammonia

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3455659A (en) * 1967-09-06 1969-07-15 American Cyanamid Co Superheating ammonia

Also Published As

Publication number Publication date
CH401984A (en) 1965-11-15
BE617424A (en) 1962-08-31
LU41661A1 (en) 1962-07-05
FR1326643A (en) 1963-05-10

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