GB1012819A - Process for separating melamine from hot, melamine-containing gas mixtures - Google Patents

Process for separating melamine from hot, melamine-containing gas mixtures

Info

Publication number
GB1012819A
GB1012819A GB918163A GB918163A GB1012819A GB 1012819 A GB1012819 A GB 1012819A GB 918163 A GB918163 A GB 918163A GB 918163 A GB918163 A GB 918163A GB 1012819 A GB1012819 A GB 1012819A
Authority
GB
United Kingdom
Prior art keywords
melamine
ammonia
gas mixture
hot
water
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
GB918163A
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
Application filed by Stamicarbon BV filed Critical Stamicarbon BV
Publication of GB1012819A publication Critical patent/GB1012819A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treating Waste Gases (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

Melamine is recovered from a hot gas mixture containing also ammonia and carbon dioxide (e.g. obtained in the catalytic reaction of ammonia with urea or a thermol decomposition product thereof at 300-450 DEG C.) by contacting the hot gas with a substantially constant volume of water in a cooling zone, the water becoming saturated with ammonia and carbon dioxide, discharging melamine from the cooling zone, separately discharging the remaining gas, containing at least 90% of the ammonia originally present; and making up water lost by evaporation or entrainment. The gas mixture may be cooled in two stages, first cocurrent with the coolant and then countercurrent. Ammonia separated from the gas mixture after recovery of melamine may be recycled to the melamine production zone.
GB918163A 1962-03-08 1963-03-07 Process for separating melamine from hot, melamine-containing gas mixtures Expired GB1012819A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL275724 1962-03-08
NL286072 1962-11-28

Publications (1)

Publication Number Publication Date
GB1012819A true GB1012819A (en) 1965-12-08

Family

ID=26641824

Family Applications (1)

Application Number Title Priority Date Filing Date
GB918163A Expired GB1012819A (en) 1962-03-08 1963-03-07 Process for separating melamine from hot, melamine-containing gas mixtures

Country Status (5)

Country Link
BE (1) BE629244A (en)
CH (1) CH451175A (en)
DE (1) DE1204236B (en)
ES (1) ES285797A1 (en)
GB (1) GB1012819A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1215165B (en) * 1964-01-16 1966-04-28 Lentia Gmbh Method and device for the direct production of pure melamine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2918467A (en) * 1959-12-22 Production of melamine

Also Published As

Publication number Publication date
ES285797A1 (en) 1963-08-01
CH451175A (en) 1968-05-15
BE629244A (en) 1963-10-21
DE1204236B (en) 1965-11-04

Similar Documents

Publication Publication Date Title
GB995007A (en) Method for separating ammonia from mixtures of gases
GB1420037A (en) Process for the simultaneous separation of ethylene oxide and carbon dioxide from the gaseous mixtures obtained in the direct oxidation of ethylene with oxygen
US3383170A (en) Process for the recovery of sulphur dioxide and ammonia
GB1365707A (en) Process for preparing urea
GB1462117A (en) Partial or complete separation of gas mixtures containing ammonia 'nd carbon dioxide
GB1106024A (en) Urea synthesis
GB853220A (en) Process and apparatus for the preparation of urea from ammonia and carbon dioxide
GB1247951A (en) Process for preparing melamine from urea
GB1239957A (en) Process for the separation of acrylonitrile and acetonitrile
US3984469A (en) Process for the production of urea
GB753342A (en) Improvements in or relating to urea purification
GB1288309A (en)
GB917004A (en) Improvements in or relating to the synthesis of urea
GB1012819A (en) Process for separating melamine from hot, melamine-containing gas mixtures
GB1348937A (en) Processing of coke oven gas
GB960039A (en) Urea synthesis process
IE35308B1 (en) Process for the production of urea
ES261242A1 (en) Process for making ethylene diamine by treating ethylene dichloride with ammonia, and separation of vinyl chloride from ammonia
ES443998A1 (en) Treatment of water vapor generated in concentrating an aqueous urea solution
GB1240499A (en) Separating ammonia from offgas obtained in the synthesis of melamine
ES373584A1 (en) Method for the separation of melamine from a gaseous reaction mixture of melamine,ammonia and carbon dioxide
GB1003277A (en) Process and apparatus for the production and separation of melamine
US4137262A (en) Process for the production of urea
GB1147734A (en) Method for the preparation of urea
GB1129939A (en) Process for the separation and recovery of ammonia and carbon dioxide from an ammoniacal ammonium carbonate solution