GB913522A - Process for the production of melamine and guanidine sulphate - Google Patents

Process for the production of melamine and guanidine sulphate

Info

Publication number
GB913522A
GB913522A GB532960A GB532960A GB913522A GB 913522 A GB913522 A GB 913522A GB 532960 A GB532960 A GB 532960A GB 532960 A GB532960 A GB 532960A GB 913522 A GB913522 A GB 913522A
Authority
GB
United Kingdom
Prior art keywords
ammonia
weight
melamine
guanidine
sulphate
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
GB532960A
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.)
Teck Metals Ltd
Original Assignee
Teck Metals Ltd
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 Teck Metals Ltd filed Critical Teck Metals Ltd
Publication of GB913522A publication Critical patent/GB913522A/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
    • C07D251/60—Preparation of melamine from urea or from carbon dioxide and ammonia

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Melamine and/or guanidine sulphate are prepared by reacting urea, ammonia and sulphur dioxide; urea, ammonia and ammonium sulphamate; ammonia and guanidine sulphamate; or ammonia and guanidine sulphate at temperatures above 200 DEG C. and under a superatmospheric pressure of ammonia, the reaction being conducted in the presence of at least 40% of elemental sulphur based on the weight of the reactants. The process is preferably carried out continuously, the sulphur recovered being recycled after removal of an amount equivalent to that formed during the reaction. Temperatures may be varied from 200 DEG C. to 360 DEG C. in order to control the relative proportions of melamine and guanidine sulphate formed, the formation of the former being favoured by the higher temperatures in the range. The process is preferably carried out in the presence of at least 0.001% by weight of boron or a compound of boron, or at least 0.01% by weight of a compound of phosphorus, antimony or arsenic, based on the weight of the reactants.
GB532960A 1959-08-06 1960-02-01 Process for the production of melamine and guanidine sulphate Expired GB913522A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA780067 1959-08-06

Publications (1)

Publication Number Publication Date
GB913522A true GB913522A (en) 1962-12-19

Family

ID=4141123

Family Applications (1)

Application Number Title Priority Date Filing Date
GB532960A Expired GB913522A (en) 1959-08-06 1960-02-01 Process for the production of melamine and guanidine sulphate

Country Status (1)

Country Link
GB (1) GB913522A (en)

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