A process for producing an aliphatic isocyanate from an aliphatic primary amine comprising a carbonylation step in which an aliphatic primary amine is allowed to react with carbon monoxide at a temperature of about 100.degree.-250.degree. C. in the presence of an aromatic hydroxyl compound having a pKa value of not more than about 11, molecular oxygen and a catalyst system comprising at least one member selected from palladium and rhodium metals and components thereof and at least one member selected from iodine and bromine and compounds thereof and a combined separation and recovery step comprising a pyrolysis-distillation reaction in which the mixture of carbonylated products is heated to a temperature of from about 100.degree. to 300.degree. C.
从脂肪族初级胺制备脂肪族
异氰酸酯的过程包括一种羰基化步骤,在该步骤中,脂肪族初级胺与一种具有pKa值不超过约11的芳香羟基化合物,在分子氧和至少选自
钯和
铑金属及其组分和
碘和
溴及其化合物的催化剂系统的存在下,在约100度至250度C的温度下与
一氧化碳发生反应,并包括一个组合分离和回收步骤,其中包括一个热解-蒸馏反应,将羰基化产物混合物加热至约100度至300度C的温度。