BE371947A - - Google Patents
Info
- Publication number
- BE371947A BE371947A BE371947DA BE371947A BE 371947 A BE371947 A BE 371947A BE 371947D A BE371947D A BE 371947DA BE 371947 A BE371947 A BE 371947A
- Authority
- BE
- Belgium
- Prior art keywords
- cyanate
- parts
- urea
- nitrogen
- alkaline earth
- Prior art date
Links
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 14
- 239000004202 carbamide Substances 0.000 claims description 7
- 150000001913 cyanates Chemical class 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium monoxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- XLJMAIOERFSOGZ-UHFFFAOYSA-M cyanate Chemical compound [O-]C#N XLJMAIOERFSOGZ-UHFFFAOYSA-M 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- QVQLCTNNEUAWMS-UHFFFAOYSA-N Barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate dianion Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000015450 Tilia cordata Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- JBNAGKTUVSTOHZ-UHFFFAOYSA-L barium(2+);dicyanate Chemical compound [Ba+2].[O-]C#N.[O-]C#N JBNAGKTUVSTOHZ-UHFFFAOYSA-L 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- RRRRYSBZDXHZQL-UHFFFAOYSA-L calcium;dicyanate Chemical compound [Ca+2].[O-]C#N.[O-]C#N RRRRYSBZDXHZQL-UHFFFAOYSA-L 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- HFNQLYDPNAZRCH-UHFFFAOYSA-N carbonic acid Chemical class OC(O)=O.OC(O)=O HFNQLYDPNAZRCH-UHFFFAOYSA-N 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- BPOZGEPCZMRDON-UHFFFAOYSA-L magnesium;dicyanate Chemical compound [Mg+2].[O-]C#N.[O-]C#N BPOZGEPCZMRDON-UHFFFAOYSA-L 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 201000002674 obstructive nephropathy Diseases 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C3/00—Cyanogen; Compounds thereof
- C01C3/20—Thiocyanic acid; Salts thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
<Desc/Clms Page number 1>
"Procédé pour la production de cyanates alcalino-terreux".
On a trouvé que l'on obtient facilement et en bon rendement des cyanates alcalino-terreux, en chauffant à des températures comprises entre 130 et 400"C environ un mé- lange d'urée ou de produits qui en contiennent, avec un oxyde ou un carbonate alcalino-terreux. Les carbonates né- cessitent en général des températures plus élevées que les oxydes.
La réaction a lieu, pour l'oxyde de calcium par exeinple, d'après l'équation suivante:
EMI1.1
2C0(NH) + CaO = Ca(CON) + NHS + H2ù Une moitié de l'azote de l'amide se transforme en azote du cyanate, tandis que l'autre moitié s'échappe à l'état d'am- moniaque, que l'on peut employer, conjointement à de l'anhy-
<Desc/Clms Page number 2>
dride carbonique, par exemple pour la production de nou- velles quantités d'urée, ou pour d'autres usages.
La masse en fusion, obtenue en chauffant le mé- lange d'urée avec l'oxyde alcalino-terreux, a déjà fait prise ou se prend rapidement quand on la sort du four.
Quand on emploie du carbonate de chaux, la masse ne fond pas, mais ne fait que se fritter rapidement. On peut em- ployer directement le produit de la réaction pour un traitement ultérieur, la transformation du cyanate en cyanure par exemple, ou bien on peut d'abord extraire le cyanate par l'eau ou un autre dissolvant et traiter la solution ultérieurement, le cas échéant.
EXEMPLE 1.
Chauffer à une température de 180 C à 200 C, pendant 1 heure, 6 parties d'urée et 2,8 parties d'oxyde de calcium, tout en faisant passer lentement un courant d'azote sur le mélange. On obtient une masse contenant 43% de cyanate de calcium.
EXEMPLE 2.
Chauffer à une température de 250 C, pendant une demi-heure, 15 parties d'oxyde de baryum et 12 parties d'urée, dans un lent courant d'azote. Il se forme 21,5 parties d'un produit contenant 6,62% d'azote à l'état de cyanate, correspondant à 52% de cyanate de baryum.
EXEMPLE 3.
Mélanger 60 parties d'urée avec 20 parties d'oxyde de magnésium et chauffer pendant 30 minutes à une tempéra- ture de 250 C, tout en faisant passer un courant d'azote sur
<Desc/Clms Page number 3>
le mélange, qui entre en fusion.. On obtient 51 parties d'un produit contenant 9,1% d'azote à l'état de cyanate, correspondant à 36,6% de cyanate de magnésium.
<Desc / Clms Page number 1>
"Process for the production of alkaline earth cyanates".
It has been found that alkaline earth cyanates are easily and efficiently obtained by heating to temperatures between 130 and 400 ° C approximately a mixture of urea or products containing it, with an oxide or an alkaline earth carbonate Carbonates generally require higher temperatures than oxides.
The reaction takes place, for example calcium oxide, according to the following equation:
EMI1.1
2C0 (NH) + CaO = Ca (CON) + NHS + H2ù One half of the nitrogen in the amide turns into nitrogen in the cyanate, while the other half escapes as ammonia , which can be used together with anhy-
<Desc / Clms Page number 2>
carbon dioxide, for example for the production of new quantities of urea, or for other uses.
The molten mass, obtained by heating the mixture of urea with the alkaline earth oxide, has already set or sets rapidly when taken out of the oven.
When carbonate of lime is used, the mass does not melt, but only sintered quickly. The reaction product can be used directly for further work-up, for example the conversion of cyanate to cyanide, or the cyanate can first be extracted with water or another solvent and the solution subsequently treated. optionally.
EXAMPLE 1.
Heat at a temperature of 180 C to 200 C for 1 hour, 6 parts of urea and 2.8 parts of calcium oxide, while slowly passing a stream of nitrogen over the mixture. A mass is obtained containing 43% of calcium cyanate.
EXAMPLE 2.
Heat to a temperature of 250 ° C. for half an hour, 15 parts of barium oxide and 12 parts of urea, in a slow stream of nitrogen. 21.5 parts of a product containing 6.62% nitrogen in the cyanate state are formed, corresponding to 52% barium cyanate.
EXAMPLE 3.
Mix 60 parts of urea with 20 parts of magnesium oxide and heat for 30 minutes at a temperature of 250 C, while passing a stream of nitrogen through
<Desc / Clms Page number 3>
the mixture, which melts. 51 parts of a product containing 9.1% nitrogen in the cyanate state, corresponding to 36.6% magnesium cyanate, are obtained.
Claims (1)
Publications (1)
Publication Number | Publication Date |
---|---|
BE371947A true BE371947A (en) |
Family
ID=43138
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE371947D BE371947A (en) |
Country Status (1)
Country | Link |
---|---|
BE (1) | BE371947A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0132939A2 (en) * | 1983-06-30 | 1985-02-13 | Schering Agrochemicals Limited | Blowing agent compositions |
-
0
- BE BE371947D patent/BE371947A/fr unknown
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5051206A (en) * | 1983-06-20 | 1991-09-24 | Schering Agrochemicals Ltd. | Blowing agent composition |
EP0132939A2 (en) * | 1983-06-30 | 1985-02-13 | Schering Agrochemicals Limited | Blowing agent compositions |
EP0132939A3 (en) * | 1983-06-30 | 1986-01-15 | Fbc Limited | Blowing agent compositions |
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