JPS54141725A - Preparation of organic isocyanate compound - Google Patents
Preparation of organic isocyanate compoundInfo
- Publication number
- JPS54141725A JPS54141725A JP4878378A JP4878378A JPS54141725A JP S54141725 A JPS54141725 A JP S54141725A JP 4878378 A JP4878378 A JP 4878378A JP 4878378 A JP4878378 A JP 4878378A JP S54141725 A JPS54141725 A JP S54141725A
- Authority
- JP
- Japan
- Prior art keywords
- amine
- phosgene
- activated charcoal
- hydrochloride
- isocyanate compound
- 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.)
- Pending
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
PURPOSE: To prepare a high quality organic isocyanate compound in high yield and extremely fast reaction rate, by the phosgenation of an organic primary amine hydrochloride in the presence of a specific amount of activated charcoal and dimethylformamide.
CONSTITUTION: An organic primary amine hydrochloride is prepared by reacting an amine with at least 1 mole of HC1 per 1 mole of the amino group, in an inert organic solvent, if necessary, in the presence of phosgene. The amine hydrochloride thus obtained is made to react with phosgene (at least 2 moles per 1 equivalent of the hydrochloride) in the precence of activated charcoal (o.1W10 wt% based on the amine) and demethylformamide (0.01W1.0 wt% based on the amine) at 100W 200°C to obtain the objective compound such as tolylene disocyanate.
EFFECT: Rrcovered activated charcoal (containing a complex of DMF and phosgene) can be reused as the phosgenation catalyst only by adding a small amount of the lost charcoal.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4878378A JPS54141725A (en) | 1978-04-26 | 1978-04-26 | Preparation of organic isocyanate compound |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4878378A JPS54141725A (en) | 1978-04-26 | 1978-04-26 | Preparation of organic isocyanate compound |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54141725A true JPS54141725A (en) | 1979-11-05 |
Family
ID=12812841
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4878378A Pending JPS54141725A (en) | 1978-04-26 | 1978-04-26 | Preparation of organic isocyanate compound |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54141725A (en) |
-
1978
- 1978-04-26 JP JP4878378A patent/JPS54141725A/en active Pending
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