GB800722A - Improvements in the production of melamine from urea - Google Patents
Improvements in the production of melamine from ureaInfo
- Publication number
- GB800722A GB800722A GB7297/56A GB729756A GB800722A GB 800722 A GB800722 A GB 800722A GB 7297/56 A GB7297/56 A GB 7297/56A GB 729756 A GB729756 A GB 729756A GB 800722 A GB800722 A GB 800722A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- melamine
- urea
- dehydrated
- cent
- 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
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)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Catalysts (AREA)
Abstract
Melamine is prepared under conditions in which corrosion to apparatus is reduced by first dehydrating urea by heating it to 135 DEG to 150 DEG C. for 1 to 12 hours under atmospheric or sub-atmospheric pressure and subsequently passing the dehydrated urea through an enclosure heated to a temperature of from 350 DEG to 450 DEG C. under a pressure of between 20 and 100 atmospheres in the presence of ammonia. The urea may be dehydrated in a stainless steel vessel and the conversion to melamine may be carried out in a reactor constructed of an alloy consisting of 14 per cent Cr, 58 per cent Ni, 17 per cent Mo, 6 per cent Fe and 5 per cent W, or of 19-21 per cent Cr, 46-53 per cent Co, 9-11 per cent Ni, 3 per cent Fe, 14-16 per cent W and minor percentages of Si and Mg.ALSO:Chemical apparatus for use in the preparation of melamine is constructed of alloys consisting of 14 per cent Cr, 58 per cent Ni, 17 per cent Mo, 6 per cent Fe, and 5 per cent W, or of 19-21 per cent Cr, 46-53 per cent Co, 9-11 per cent Ni, 3 per cent Fe (mamximum), 14-16 per cent W and mior percentages of silicon and magnesium.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT800722X | 1955-03-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB800722A true GB800722A (en) | 1958-09-03 |
Family
ID=11316864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7297/56A Expired GB800722A (en) | 1955-03-12 | 1956-03-08 | Improvements in the production of melamine from urea |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB800722A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995001345A1 (en) * | 1993-07-01 | 1995-01-12 | Kemira Oy | Process for the preparation of melamine |
| WO1996020182A1 (en) * | 1994-12-23 | 1996-07-04 | Agrolinz Melamin Gmbh | Process for producing high-purity melamine |
| WO1996023778A1 (en) * | 1995-02-03 | 1996-08-08 | Agrolinz Melamin Gmbh | Process for purifying melamine |
-
1956
- 1956-03-08 GB GB7297/56A patent/GB800722A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995001345A1 (en) * | 1993-07-01 | 1995-01-12 | Kemira Oy | Process for the preparation of melamine |
| US5731437A (en) * | 1993-07-01 | 1998-03-24 | Kemira Agro Oy | Process for the preparation of melamine |
| WO1996020182A1 (en) * | 1994-12-23 | 1996-07-04 | Agrolinz Melamin Gmbh | Process for producing high-purity melamine |
| US5721363A (en) * | 1994-12-23 | 1998-02-24 | Agrolinz Melamin Gmbh | Process for the production of highly pure melamine |
| CN1082951C (en) * | 1994-12-23 | 2002-04-17 | 阿格罗林茨蜜胺有限公司 | Process for producing high purity melamine |
| WO1996023778A1 (en) * | 1995-02-03 | 1996-08-08 | Agrolinz Melamin Gmbh | Process for purifying melamine |
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