| 摘要 |
PURPOSE:To obtain isocyanates stably for a long time in easy separation of a catalyst from the product, high space time yield and high selectivity when carbamic acid esters are thermally decomposed to produce isocyanates. CONSTITUTION:A method for producing isocyanates by thermally decomposing carbamic acid esters in a vapor phase in the presence of (A) an oxide sintered compact containing at least one or more kinds of elements selected from transition metal elements of the groups from Ib to VIII, in a periodic table, lantanoids and actinoids and (B) an oxide sintered compact containing an alkali metal element and/or an alkaline earth metal element as a catalyst. |
