| 摘要 |
1,245,480. Isocyanates. OLIN CORP. 13 Nov., 1968 [18 Dec., 1967], No. 53878/68. Heading C2C. Organic isocyanates are made by reacting an organic nitro compound with carbon monoxide at a raised temperature and pressure in the presence of a catalyst comprising a mixture of (a) a heteroaromatic compound containing 5 or 6 members in a ring containing carbon and 1 or 2 nitrogen atoms only and at least 2 double bonds, or a substitution product (including a fused-ring substitution product) or a salt of such a compound and (b) a halide or oxide of a platinum-group metal, silver or gold, or a complex of components (a) and (b). Additionally, the catalyst may comprise an oxide or oxides of vanadium, molybdenum, tungsten, niobium, chromium and tantalum. |
