GB916187A - Process for the preparation of pure melamine - Google Patents

Process for the preparation of pure melamine

Info

Publication number
GB916187A
GB916187A GB31776/61A GB3177661A GB916187A GB 916187 A GB916187 A GB 916187A GB 31776/61 A GB31776/61 A GB 31776/61A GB 3177661 A GB3177661 A GB 3177661A GB 916187 A GB916187 A GB 916187A
Authority
GB
United Kingdom
Prior art keywords
melamine
solution
rectification
preparation
carbon dioxide
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
GB31776/61A
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 GB916187A publication Critical patent/GB916187A/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
    • 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)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

Melamine is obtained from a gas mixture which contains melamine, ammonia, carbon dioxide and solid impurities, by absorbing the mixture in water, removing ammonia and carbon dioxide from the resulting solution by rectification, removing solid impurities, and crystallising and separating melamine from the solution. The temperature of the solution in the absorption step is preferably kept at approximately 65 DEG C. After rectification the solution may be clarified by treatment with an absorbing agent e.g. diatomaceous earth, kieselguhr, or activated carbon. The melamine is preferably separated by crystallisation at below atmospheric pressure.
GB31776/61A 1960-09-05 1961-09-04 Process for the preparation of pure melamine Expired GB916187A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL255602 1960-09-05

Publications (1)

Publication Number Publication Date
GB916187A true GB916187A (en) 1963-01-23

Family

ID=19752545

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31776/61A Expired GB916187A (en) 1960-09-05 1961-09-04 Process for the preparation of pure melamine

Country Status (3)

Country Link
BE (1) BE607793A (en)
CH (1) CH417615A (en)
GB (1) GB916187A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2835720A (en) * 1955-05-09 1958-05-20 Gen Motors Corp Battery vent plug
US3290308A (en) * 1964-02-11 1966-12-06 Chemical Construction Corp Synthesis of pure melamine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2835720A (en) * 1955-05-09 1958-05-20 Gen Motors Corp Battery vent plug
US3290308A (en) * 1964-02-11 1966-12-06 Chemical Construction Corp Synthesis of pure melamine

Also Published As

Publication number Publication date
BE607793A (en) 1962-03-05
CH417615A (en) 1966-07-31

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