JPS5517331A - Preparation of melamine - Google Patents

Preparation of melamine

Info

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
Application number
JP8992278A
Other languages
Japanese (ja)
Other versions
JPS591263B2 (en
Inventor
Atsuhiko Hiai
Yoshiaki Toyoda
Tadaharu Hase
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.)
Mitsui Toatsu Chemicals Inc
Original Assignee
Mitsui Toatsu Chemicals Inc
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 Mitsui Toatsu Chemicals Inc filed Critical Mitsui Toatsu Chemicals Inc
Priority to JP53089922A priority Critical patent/JPS591263B2/en
Publication of JPS5517331A publication Critical patent/JPS5517331A/en
Publication of JPS591263B2 publication Critical patent/JPS591263B2/en
Expired legal-status Critical Current

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
JP53089922A 1978-07-25 1978-07-25 Melamine manufacturing method Expired JPS591263B2 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62167446U (en) * 1986-04-15 1987-10-23

Cited By (1)

* Cited by examiner, † Cited by third party
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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