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    • 8. 发明公开
    • 이소시아네이트의 제조 방법
    • 生产异氰酸酯的方法
    • KR1020070104857A
    • 2007-10-29
    • KR1020070039477
    • 2007-04-23
    • 바이엘 머티리얼싸이언스 엘엘씨코베스트로 도이칠란드 아게
    • 로렌츠,볼프강뵘,마티아스브래디,빌퍼디허트,도날드
    • C07C263/10C07C263/18
    • C07C263/10C01B7/0706C01B7/0731C07C263/20C07C265/14
    • A process for preparing an isocyanate is provided to minimize loss of phosgene used as a starting material, to recover phosgene at a high yield, and to avoid the problems related to process stability caused by a high content of phosgene in HCl stream. A process for preparing an isocyanate comprises the steps of: (a) optionally in the presence of a solvent, reacting at least one amine with phosgene to obtain the corresponding isocyanate, and a stream containing HCl, phosgene, optionally the solvent, a low-boiling point compound and an inert substance; (b) separating the stream through at least two sequential absorption steps including (1) at least one isothermal absorption step, and (2) at least one adiabatic absorption step to obtain (i) a HCl stream containing at most 0.5 wt% of phosgene based on the total weight thereof, and (ii) a liquid phosgene stream; and (c) recycling the liquid phosgene stream(ii) to step (a).
    • 提供了一种制备异氰酸酯的方法,以使用作原料的光气的损失最小化,以高产率回收光气,并避免与由HCl流中高含量的光气引起的与工艺稳定性有关的问题。 一种制备异氰酸酯的方法包括以下步骤:(a)任选地在溶剂存在下,使至少一种胺与光气反应得到相应的异氰酸酯,以及含有HCl,光气,任选的溶剂的物流, 沸点化合物和惰性物质; (b)通过至少两个顺序吸收步骤分离所述流,所述步骤包括(1)至少一个等温吸收步骤,和(2)至少一个绝热吸收步骤,以获得(i)含有至多0.5wt%光气的HCl料流 基于其总重量,和(ii)液体光气流; 和(c)将液体光气流(ii)再循环到步骤(a)。