| 摘要 |
1499128 Aliphatic isocyanates BASF AG 5 May 1975 [8 May 1974] 18654/75 Heading C2C Aliphatic isocyanates are obtained by thermal decomposition of the corresponding carbamic acid halides in a process in which the carbamic acid halides are decomposed in the vapour state in from 2 to 6 successive reaction chambers at not less than 20‹ C. above their boiling points and the bulk of the hydrogen halide issuing from each reaction chamber is removed before the reaction mixture, in the vapour state, enters the next reaction chamber. |
