N-Substituted Carbamic Acid Ester Production Method, Isocyanate Production Method Using Such N-Substituted Carbamic Acid Ester, and Composition for Transfer and Storage of N-Substituted Carbamic Acid Ester Comprising N-Substituted Carbamic Acid Ester and Aromatic Hydroxy Compound
申请人:Asahi Kasei Chemicals Corporation
公开号:US20140194650A1
公开(公告)日:2014-07-10
The present invention is a method for producing an N-substituted carbamic acid ester derived from an organic amine from an organic amine, a carbonic acid derivative and a hydroxy composition containing one or more types of hydroxy compounds, wherein the organic amine, the carbonic acid derivative and the hydroxy composition are reacted using a urethane production reaction vessel provided with a condenser, a gas containing the hydroxy composition, the compound having the carbonyl group derived from the carbonic acid derivative, and an ammonia formed as a by-product in the reaction, is introduced into the condenser provided in the urethane production reaction vessel, and the hydroxy composition and the compound having the carbonyl group derived from the carbonic acid derivative are condensed, and wherein a stoichiometric ratio of a hydroxy compound contained in the condensed hydroxy composition to the condensed compound having the carbonyl group derived from the carbonic acid derivative is 1 or more, and a ratio of number of carbonyl groups (—C(═O)—) contained in the compound having the carbonyl group derived from the carbonic acid derivative and number of ammonia molecules contained in the ammonia recovered as a gas from the condenser is 1 or less.
本发明是一种从有机胺、碳酸酯衍生物和含有一种或多种羟基化合物中制备N-取代的氨基甲酸酯的方法,其中利用一种尿素生产反应容器反应有机胺、碳酸酯衍生物和羟基化合物,该反应容器配有冷凝器,将含有羟基化合物的气体、由碳酸酯衍生物产生的含有羰基基团的化合物以及在反应中生成的氨引入到尿素生产反应容器中的冷凝器中,将羟基化合物和含有羰基基团的碳酸酯衍生物冷凝,其中在冷凝的羟基化合物中所含的羟基化合物的化学计量比与所冷凝的含有羰基基团的化合物的化学计量比为1或更多,而且所含有羰基基团的化合物中所含的羰基基团(-C(═O)-)的数量与从冷凝器中回收的氨分子数量的比率为1或更小。