Process for the preparation of (cyclo)aliphatic diisocyanates
    5.
    发明授权
    Process for the preparation of (cyclo)aliphatic diisocyanates 失效
    制备(环)脂族二异氰酸酯的方法

    公开(公告)号:US4847408A

    公开(公告)日:1989-07-11

    申请号:US185721

    申请日:1988-04-25

    CPC分类号: C07C263/10 C07C263/20

    摘要: The present invention relates to a process for the preparation of diisocyanates corresponding to the formulaOCN--R--NCOwhereinR denotes a (cyclo)aliphatic hydrocarbon group with up to 15 carbon atomsby phosgenation of the corresponding diamines represented by the formulaH.sub.2 N--R--NH.sub.2in the gas phase, characterized in that(a) the diamines in vapor form, optionally diluted with an inert gas or with the vapors of an inert solvent, and phosgene are separately heated to temperatures of about 200.degree. to 600.degree. C. and continuously reacted together in a cylindrical reaction chamber which is free from moving parts and heated to about 200.degree. to 600.degree. C., while a turbulent flow is maintained in the reaction chamber.(b) the gas mixture continuously leaving the reaction chamber is passed through an inert solvent for the diisocyanate which is maintained at a temperature above the decomposition temperature of the carbamic acid chloride corresponding to the diamine, and(c) the diisocyanate which is dissolved in the inert solvent is purified by distillation.

    摘要翻译: 本发明涉及一种制备相应于式OCN-R-NCO的二异氰酸酯的方法,其中R表示通过由式H2N-R表示的相应二胺的光气化而具有至多15个碳原子的(环)脂族烃基 -NH 2,其特征在于(a)蒸气形式的二胺,任选地用惰性气体或惰性溶剂的蒸气和光气稀释,分别加热至约200℃至600℃的温度。 并在没有移动部件的圆筒形反应室中连续反应并加热至约200℃至600℃,同时在反应室中保持湍流。 (b)连续离开反应室的气体混合物通过二异氰酸酯的惰性溶剂,该二异氰酸酯保持在高于对应于二胺的氨基甲酰氯的分解温度的温度,和(c)溶于 通过蒸馏纯化惰性溶剂。