Process for preparing isocyanates using sintered oxides
AssigneeNippon Shokubai Co., Ltd.
InventorsYuuji Shimasaki, Hideyuki Kanbe, Masako Hokazono
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Abstract
A method for preparing isocyanates by the thermal decomposition of carbamates in the presence of a sintered oxide as catalyst under gaseous phase condition. The sintered oxide is composed of at least one element selected from the group consisting of boron, aluminum, silicon, tin, lead, antimony, zinc, yttrium, lanthanum, titanium, zirconium, niobium, tungsten, and iron. The sintered oxide may be composed of at least one element selected from the group consisting of phosphorus, alkali metal element, and alkaline earth metal element.
Claims10
A process for preparing isocyanates comprising thermally decomposing carbamates, passing said carbamates through a catalyst bed of a sintered oxide during said step of thermally decomposing, said step of thermally decomposing occurs at a reaction temperature in the range of from 300.degree. C. to 450.degree. C. and said step of thermally decomposing occurs when said carbamates are in a gaseous phase.
Dependencies are inferred from the claim text.