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    • 5. 发明公开
    • METHOD FOR PRODUCING ISOCYANATE
    • 生产异氰酸酯的方法
    • EP3293173A1
    • 2018-03-14
    • EP17188407.5
    • 2014-03-28
    • Asahi Kasei Kabushiki Kaisha
    • SHINOHATA, MasaakiTAKEUCHI, KoujiFUJIMOTO, NaokiMIYAKE, Nobuhisa
    • C07C263/04C07C263/20C07C265/14C07C269/04C07C271/06
    • C07C263/04C07C269/04Y02P20/51C07C265/14C07C271/06
    • A method for producing an isocyanate, comprising: a carbamation step of generating an N-substituted carbamate from an organic primary amine, urea and an organic hydroxy compound according to a carbamation reaction, and then recovering a first gaseous phase component containing the urea and/or a compound having a carbonyl group derived from the urea, the organic hydroxy compound, and ammonia; a condensation step of condensing the first gaseous phase component with a condenser; an isocyanate production step of producing an isocyanate by subjecting the N-substituted carbamate to pyrolysis; an ammonia absorption step of allowing a second gaseous phase component containing ammonia recovered as a gaseous phase component from the condenser as a main component, to be absorbed by absorption water, and generating gas-absorbed water; and an ammonia stripping step of heating the gas-absorbed water to separate ammonia from the gas-absorbed water.
    • 1。一种异氰酸酯的制造方法,其特征在于,包括:根据氨基甲酰化反应从有机伯胺,尿素和有机羟基化合物生成N-取代氨基甲酸酯的氨基甲酸酯化工序,然后回收含有尿素和/ 或具有衍生自脲,有机羟基化合物和氨的羰基的化合物; 使第一气相组分与冷凝器冷凝的冷凝步骤; 通过对N-取代氨基甲酸酯进行热分解来制造异氰酸酯的异氰酸酯制造工序; 氨回收工序,将从冷凝器回收的含有氨作为气相成分的第二气相成分作为主要成分吸收在吸收水中,生成吸收气体的水; 以及加热所述吸收气体的水以从所述气体吸收水中分离氨的氨汽提步骤。