JPS5517331A - Preparation of melamine - Google Patents
Preparation of melamineInfo
- Publication number
- JPS5517331A JPS5517331A JP8992278A JP8992278A JPS5517331A JP S5517331 A JPS5517331 A JP S5517331A JP 8992278 A JP8992278 A JP 8992278A JP 8992278 A JP8992278 A JP 8992278A JP S5517331 A JPS5517331 A JP S5517331A
- Authority
- JP
- Japan
- Prior art keywords
- melamine
- urea
- catalyst
- pref
- synthesis
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
Abstract
PURPOSE: To prepare high quality melamine, in high conversion, without interruption of the operation, using a catalyst having high activity, by pretreating urea and/or its thermal cracking product with activated charcoal at a specific temperature, and charging a reactor with the pretreated urea, thereby eliminating the need of catalyst regeneration.
CONSTITUTION: Urea or its heat-decomposition product is molten, and treated with powdery and/or granular activated charcoal at 130-180°C, pref. 132-145°C for 1-60 min., pref. 5-30 min. The pretreated urea is used as a raw material of melamine-synthesis using a solid acid catalyst such as γ-alumina. The synthesis of melamine is carried out in the presence of γ-alumina catalyst fluidized with a mixed gas comprising 50 wt% of NH3 and 50wt% of CO2, at 380-400°C, between atmospheric pressure and 2 kg/cm2G.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53089922A JPS591263B2 (en) | 1978-07-25 | 1978-07-25 | Melamine manufacturing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53089922A JPS591263B2 (en) | 1978-07-25 | 1978-07-25 | Melamine manufacturing method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5517331A true JPS5517331A (en) | 1980-02-06 |
JPS591263B2 JPS591263B2 (en) | 1984-01-11 |
Family
ID=13984185
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53089922A Expired JPS591263B2 (en) | 1978-07-25 | 1978-07-25 | Melamine manufacturing method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS591263B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02134543A (en) * | 1988-11-16 | 1990-05-23 | Nippon Telegr & Teleph Corp <Ntt> | Method and apparatus for measuring dispersion |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62167446U (en) * | 1986-04-15 | 1987-10-23 |
-
1978
- 1978-07-25 JP JP53089922A patent/JPS591263B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02134543A (en) * | 1988-11-16 | 1990-05-23 | Nippon Telegr & Teleph Corp <Ntt> | Method and apparatus for measuring dispersion |
Also Published As
Publication number | Publication date |
---|---|
JPS591263B2 (en) | 1984-01-11 |
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