AT246146B - Process for the regeneration of used catalysts for the production of melamine - Google Patents

Process for the regeneration of used catalysts for the production of melamine

Info

Publication number
AT246146B
AT246146B AT282262A AT282262A AT246146B AT 246146 B AT246146 B AT 246146B AT 282262 A AT282262 A AT 282262A AT 282262 A AT282262 A AT 282262A AT 246146 B AT246146 B AT 246146B
Authority
AT
Austria
Prior art keywords
melamine
regeneration
production
used catalysts
water vapor
Prior art date
Application number
AT282262A
Other languages
German (de)
Inventor
Ferdinand Dr Weinrotter
Wilfried Dipl Ing Krulla
Walter Dr Mueller
Alfred Dr Schmidt
Original Assignee
Chemie Linz Ag
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 Chemie Linz Ag filed Critical Chemie Linz Ag
Priority to AT282262A priority Critical patent/AT246146B/en
Application granted granted Critical
Publication of AT246146B publication Critical patent/AT246146B/en

Links

Landscapes

  • Catalysts (AREA)

Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Regenerierung ausgebrauchter Katalysatoren für die Herstellung von Melamin 
 EMI1.1 
 

 <Desc/Clms Page number 2> 

   Melontypus.Beispiel :    In einem Röhrenofen wurde ein Cyansäure-Ammoniakgemisch bei 340  C über einen Mischoxyd- 
 EMI2.1 
 



    PaOgPATENTANSPRÜCHE :    
1. Verfahren zur Regenerierung ausgebrauchter Katalysatorenwie z. B. von Silikagel, Tonerde, Thoriumoxyd, verschiedenen Mischoxyden mit Phosphorpentoxyd u. a. m. für die Herstellung von Melamin aus Harnstoff, dessen thermischen Zersetzungsprodukten oder Cyansäure, dadurch gekennzeichnet, dass die inaktiv gewordenen Katalysatoren mit überhitztem Wasserdampf, der gegebenenfalls durch inerte Gase und/oder geringe Mengen Sauerstoff verdünnt sein kann, von rund 250 bis 600   C behandelt werden, bis das Abgas ammoniakfrei ist.



   <Desc / Clms Page number 1>
 



  Process for the regeneration of used catalysts for the production of melamine
 EMI1.1
 

 <Desc / Clms Page number 2>

   Melon type: Example: In a tube furnace, a cyanic acid-ammonia mixture was poured over a mixed
 EMI2.1
 



    PaOg PATENT CLAIMS:
1. Process for the regeneration of spent catalysts such as e.g. B. of silica gel, clay, thorium oxide, various mixed oxides with phosphorus pentoxide u. a. m. for the production of melamine from urea, its thermal decomposition products or cyanic acid, characterized in that the inactive catalysts are treated with superheated steam, which can optionally be diluted by inert gases and / or small amounts of oxygen, at around 250 to 600 C, until the exhaust gas is free of ammonia.

Claims (1)

2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der überhitzte Wasserdampf mit einem Inertgas wie Kohlendioxyd und/oder Stickstoff, vorzugsweise im Volumsverhältnis Wasserdampf zu Inertgas von 5 : 1 verdünnt wird. 2. The method according to claim 1, characterized in that the superheated water vapor with an inert gas such as carbon dioxide and / or nitrogen, preferably in a volume ratio of water vapor to inert gas of 5: 1 is diluted. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass dem gegebenenfalls verdünnten Wasserdampf eine geringe Menge, vorzugsweise bis rund 5 Vol.-%, an Sauerstoff zugemischt wird. 3. The method according to claim 1 or 2, characterized in that a small amount, preferably up to around 5 vol .-%, of oxygen is added to the optionally diluted water vapor.
AT282262A 1962-04-06 1962-04-06 Process for the regeneration of used catalysts for the production of melamine AT246146B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT282262A AT246146B (en) 1962-04-06 1962-04-06 Process for the regeneration of used catalysts for the production of melamine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT282262A AT246146B (en) 1962-04-06 1962-04-06 Process for the regeneration of used catalysts for the production of melamine

Publications (1)

Publication Number Publication Date
AT246146B true AT246146B (en) 1966-04-12

Family

ID=3540838

Family Applications (1)

Application Number Title Priority Date Filing Date
AT282262A AT246146B (en) 1962-04-06 1962-04-06 Process for the regeneration of used catalysts for the production of melamine

Country Status (1)

Country Link
AT (1) AT246146B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0075819A2 (en) * 1981-09-26 1983-04-06 BASF Aktiengesellschaft Process for improving melamine quality by reactivating the catalysts used in the melamine synthesis

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0075819A2 (en) * 1981-09-26 1983-04-06 BASF Aktiengesellschaft Process for improving melamine quality by reactivating the catalysts used in the melamine synthesis
EP0075819A3 (en) * 1981-09-26 1984-03-21 Basf Aktiengesellschaft Process for improving melamine quality by reactivating the catalysts used in the melamine synthesis

Similar Documents

Publication Publication Date Title
EP0310608A1 (en) Process for producing an active carbon catalyst.
DE1259298B (en) Process for removing nitrogen oxides from gases by catalytic reduction thereof to nitrogen
AT246146B (en) Process for the regeneration of used catalysts for the production of melamine
DE854205C (en) Manufacture of sulfuric acid
DE1518729C3 (en) Process for the preparation of a mixture of acrylic acid and acrolein
DE1956874B2 (en) Circular process for the production of ket oximes
DE1543294C3 (en) Process for the production of acrylic acid or methacrylic acid
DE550909C (en) Process for the catalytic production of hydrogen cyanide
DE2926107C2 (en) Process for separating nitrogen oxides from gases
DE1964786C3 (en) Process for the production of acrylonitrile from propane
DE1167348B (en) Process for the regeneration of used catalysts for the production of melamine
DE2932322C2 (en) Catalytic process for the production of ammonia from hydrogen cyanide
DE698852C (en) Production of concentrated nitrogen oxides
US2450105A (en) Process for obtaining nitrogen tetroxide
DE526764C (en) Production of easily condensable nitrogen oxides
DE660734C (en) Process to accelerate the formation of nitrogen dioxide
DE354321C (en) Process for the oxidation of ammonia gas
DE2040219C3 (en) Process for the production of nitrous oxide
AT243804B (en) Process for the production of melamine
DE544193C (en) Absorption of diluted nitrous gases
DE936389C (en) Process for the production of hydrocyanic acid
DE648509C (en) Process for processing ammonia-free, pre-cleaned coke oven gases for ammonia
DE374773C (en) Process for the catalytic production of ammonia
DE2412162C3 (en) Supported catalyst
AT231418B (en) Process for the production of acrolein by the catalytic oxidation of propylene