GB1033026A - Process for the production of melamine from urea - Google Patents

Process for the production of melamine from urea

Info

Publication number
GB1033026A
GB1033026A GB881163A GB881163A GB1033026A GB 1033026 A GB1033026 A GB 1033026A GB 881163 A GB881163 A GB 881163A GB 881163 A GB881163 A GB 881163A GB 1033026 A GB1033026 A GB 1033026A
Authority
GB
United Kingdom
Prior art keywords
urea
melamine
reactor
vessel
zone
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
GB881163A
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.)
Allied Corp
Original Assignee
Allied Chemical Corp
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
Application filed by Allied Chemical Corp filed Critical Allied Chemical Corp
Publication of GB1033026A publication Critical patent/GB1033026A/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
    • B01J19/0053—Details of the reactor
    • B01J19/006—Baffles
    • 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
    • B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
    • 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
    • B01J2219/00135—Electric resistance heaters
    • 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
    • B01J2219/025—Apparatus characterised by their chemically-resistant properties characterised by the construction materials of the reactor vessel proper
    • B01J2219/0277—Metal based
    • 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
    • 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
    • B01J2219/19—Details relating to the geometry of the reactor
    • B01J2219/194—Details relating to the geometry of the reactor round
    • B01J2219/1941—Details relating to the geometry of the reactor round circular or disk-shaped
    • B01J2219/1943—Details relating to the geometry of the reactor round circular or disk-shaped cylindrical

Abstract

Melamine is made from urea by a process which comprises continuously introducing molten urea into the bottom of a vertically arranged heated zone in a reactor, said heated zone being produced and maintained at at least 350 DEG C., preferably 375 DEG to 450 DEG C., by heaters within the said vessel, directing said urea into intimate contact with a hot molten mixture comprising melamine, unreacted urea and reaction by-products, whereby said urea is caused to pyrolyse to melamine and gases are produced which, with the aid of the thermal lift in said heating zone, cause the reaction mixture to circulate upward in said heated zone with continued pyrolysis of the urea, removing part of the melamine and gaseous by-products from the upper portion of said reaction vessel, causing recirculation of the remaining part within said vessel to the lower portion of said vessel by downward thermal flow produced by establishing a relatively cooler zone in said reaction vessel, and maintaining the pressure at at least 1000 p.s.i.g. (70 kg./cm.2) and preferably at 1500 to 3000 p.s.i.g. (105 to 210 kg./cm.2). During any interruption of urea feed, ammonia gas is fed into the reactor into the bottom of the heated zone to maintain circulation. Prior to commencement of the urea feed, the reactor is fed with hot water and heated to 350 DEG C. at 3500 p.s.i.g. (245 kg./cm.2) and then the water is drained and the reactor is then preferably purged with ammonia. The invention is described with reference to a drawing of (not shown) an apparatus which is the subject matter of Specification 1,033,027. Reference is made to Specification 735,356.
GB881163A 1962-03-06 1963-03-05 Process for the production of melamine from urea Expired GB1033026A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US17791962A 1962-03-06 1962-03-06

Publications (1)

Publication Number Publication Date
GB1033026A true GB1033026A (en) 1966-06-15

Family

ID=22650457

Family Applications (2)

Application Number Title Priority Date Filing Date
GB4004165A Expired GB1033027A (en) 1962-03-06 1963-03-05 Reaction apparatus, particularly suitable for use in the production of melamine from urea
GB881163A Expired GB1033026A (en) 1962-03-06 1963-03-05 Process for the production of melamine from urea

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB4004165A Expired GB1033027A (en) 1962-03-06 1963-03-05 Reaction apparatus, particularly suitable for use in the production of melamine from urea

Country Status (2)

Country Link
GB (2) GB1033027A (en)
NL (1) NL289748A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104776746A (en) * 2014-01-10 2015-07-15 欧洲技术设于伊特根的三聚氰氨-卢森堡-分支机构 Tube heat exchange assembly and apparatus, in particular a reactor for the production of melamine, comprising such a heat exchange assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104776746A (en) * 2014-01-10 2015-07-15 欧洲技术设于伊特根的三聚氰氨-卢森堡-分支机构 Tube heat exchange assembly and apparatus, in particular a reactor for the production of melamine, comprising such a heat exchange assembly

Also Published As

Publication number Publication date
GB1033027A (en) 1966-06-15
NL289748A (en) 1965-06-10

Similar Documents

Publication Publication Date Title
DE3274365D1 (en) Pyrolysis system with hot gas circulation
HUT69581A (en) Method and apparatus for upgrading carbonacedus fuel
GB1178449A (en) Method and Apparatus for Performing Pyrolysis Reactions.
SE8104582L (en) METHOD OF PRODUCING METHANOL
HU911656D0 (en) Process for preparing heat treatments
GB1033026A (en) Process for the production of melamine from urea
GB661560A (en) Improvements in process for contacting solids and gases employing fluid bed operation
GB1494962A (en) Method of and apparatus for heat treating finely divided material
GB1021851A (en) Method and apparatus for heat-finishing glass ribbon or sheet
GB848381A (en) Reactor for and its use in preparing melamine
GR72977B (en)
GB1487814A (en) Method of and apparatus for boiling cooking steaming simmering and sterilising liquid porridge-like or lumpy feeds
DE3268756D1 (en) Process for the production of pyrolysis gas from combustible materials, and installation for carrying out the process
GB965709A (en) An improved process for producing activated carbon
ES238770A1 (en) Method for producing melamine
US1352192A (en) Process and means for producing metallic cyanids
FR2660303B1 (en) PROCESS AND DEVICE FOR FORMING CALCIUM OXIDE.
US3499737A (en) Method and apparatus for sparging chlorine into a reactor for producing cyanogen chloride
ES346614A3 (en) Procedure and apparatus for the production of melamine from urea. (Machine-translation by Google Translate, not legally binding)
SU467761A1 (en) Apparatus for producing activated carbon in a fluidized bed
GB730223A (en) Improved fluidized hydroforming process
GB906139A (en) Improvements relating to heat treatment of rubber
GB661223A (en) Process and apparatus for conducting chemical reactions
Fitzpatrick et al. Decoating of Aluminum Scrap
PL97959B1 (en) METHOD OF DEGASSING COAL IN A FLUID BED