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GB968765A - Process for the preparation of melamine from cyanic acid - Google Patents

Process for the preparation of melamine from cyanic acid

Info

Publication number
GB968765A
GB968765A GB3562762A GB3562762A GB968765A GB 968765 A GB968765 A GB 968765A GB 3562762 A GB3562762 A GB 3562762A GB 3562762 A GB3562762 A GB 3562762A GB 968765 A GB968765 A GB 968765A
Authority
GB
United Kingdom
Prior art keywords
phosphate
mixture
prepared
acid
melamine
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
GB3562762A
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.)
OSTERREIOHISCHE STICKSTOFFWERK
Original Assignee
OSTERREIOHISCHE STICKSTOFFWERK
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 OSTERREIOHISCHE STICKSTOFFWERK filed Critical OSTERREIOHISCHE STICKSTOFFWERK
Publication of GB968765A publication Critical patent/GB968765A/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
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/14—Phosphorus; Compounds thereof
    • B01J27/16—Phosphorus; Compounds thereof containing oxygen, i.e. acids, anhydrides and their derivates with N, S, B or halogens without carriers or on carriers based on C, Si, Al or Zr; also salts of Si, Al and Zr
    • 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
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/14—Phosphorus; Compounds thereof
    • B01J27/182—Phosphorus; Compounds thereof with silicon
    • 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
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/14—Phosphorus; Compounds thereof
    • B01J27/185—Phosphorus; Compounds thereof with iron group metals or platinum group metals
    • B01J27/1853—Phosphorus; Compounds thereof with iron group metals or platinum group metals with iron, cobalt or nickel

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Catalysts (AREA)

Abstract

Boron phosphate having a mole ratio P : B of 1.14 : 1 is prepared by allowing a mixture of boric acid and phosphoric acid to stand at room temperature for 20 hours. Silicon pyrophosphate is prepared by heating amorphous silicic acid with phosphoric acid. A mixture of boron phosphate and silicon pyrophosphate is prepared by adding boric acid to a mixture of phosphoric acid and silicic acid sol and allowing the mixture to stand at room temperature for 20 hours. Aluminium phosphate and ferric phosphate are respectively prepared by addition of trisodium phosphate dodecahydrate to aqueous solutions of aluminium nitrate and ferric nitrate.ALSO:Melamine is prepared by conducting a mixture of gaseous cyanic acid and an anhydrous inert carrier gas over boron phosphate, aluminium phosphate, ferric phosphate or silicon pyrophosphate, or mixtures of such materials, at a temperature of from 280 to 400 DEG C. and a pressure of from 1 to 11 atmospheres absolute, the resulting melamine being condensed out by subsequently cooling the ffluent gas. The catalyst may contain an excess of phosphorus pentoxide up to 50% above the stoichiometric amount. Specified carrier gases are ammonia, nitrogen and carbon dioxide. Examples are given.
GB3562762A 1961-09-21 1962-09-19 Process for the preparation of melamine from cyanic acid Expired GB968765A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT713561A AT250369B (en) 1961-09-21 1961-09-21 Process for the production of melamine from cyanic acid

Publications (1)

Publication Number Publication Date
GB968765A true GB968765A (en) 1964-09-02

Family

ID=3593037

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3562762A Expired GB968765A (en) 1961-09-21 1962-09-19 Process for the preparation of melamine from cyanic acid

Country Status (3)

Country Link
AT (1) AT250369B (en)
CH (1) CH412917A (en)
GB (1) GB968765A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0075612A1 (en) * 1981-09-30 1983-04-06 American Cyanamid Company Process for trimerizing isocyanic acid to make cyanuric acid
CN114939403A (en) * 2022-06-14 2022-08-26 宁波中科远东催化工程技术有限公司 Catalyst for producing melamine and preparation method and application thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0075612A1 (en) * 1981-09-30 1983-04-06 American Cyanamid Company Process for trimerizing isocyanic acid to make cyanuric acid
CN114939403A (en) * 2022-06-14 2022-08-26 宁波中科远东催化工程技术有限公司 Catalyst for producing melamine and preparation method and application thereof
CN114939403B (en) * 2022-06-14 2024-01-26 宁波中科远东催化工程技术有限公司 Catalyst for producing melamine and preparation method and application thereof

Also Published As

Publication number Publication date
CH412917A (en) 1966-05-15
AT250369B (en) 1966-11-10

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