C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 265/00 (2006.01) C07C 263/06 (2006.01)
Patent
CA 2100718
- 7 - Abstract A process for the preparation of isocyanates which is characterized in that N,N,N'-trisubstituted ureas of the formula Image I in which R1, R2 and R3 are identical or different and are a linear, branched or cyclic (C1-C2,)-alkyl radical which is unsubstituted or substituted by (C1-C6)-alkoxy, option- ally substituted phenyl, halogen or other radicals which are inert under the reaction conditions used, or R2 and R3 together are a heterocyclic non- aromatic ring which can optionally contain further heteroatoms, are decomposed, in a diluent which is inert under the reaction conditions, at elevated temperature, to an isocyanate of high volatility of the formula R1NCO and to a secondary amine of low volatility of the formula R2R3NH, whose boiling point is above that of the isocyanate and above the reaction temperature used, after which the isocyanate is drawn off at the top by means of a stream of carrier gas.
Falk Heinz
Hackl Kurt Alfred
Dsm Fine Chemicals Austria Gmbh
Riches Mckenzie & Herbert Llp
LandOfFree
Process for the preparation of isocyanates by the... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the preparation of isocyanates by the..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of isocyanates by the... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1557066