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    • 11. 发明申请
    • PROCESS FOR PREPARING ISOCYANATES FROM PRIMARY AMINES WHICH ARE NOT READILY DISSOLVED
    • 用于生产重ISOCYANATES从小学水溶性胺类
    • WO1998025888A1
    • 1998-06-18
    • PCT/EP1997006585
    • 1997-11-26
    • BAYER AKTIENGESELLSCHAFTHEITKÄMPER, Peter
    • BAYER AKTIENGESELLSCHAFT
    • C07C263/10
    • C07C263/10C07C265/14
    • Isocyanates are prepared by the "cold-hot phosgenation" of primary amines which are not readily dissolved in chlorobenzene and/or o-dichlorobenzene. According to this process phosgene is dissolved in a solvent (A) consisting of chlorobenzene and/or o-dichlorobenzene. The amine to be reacted is likewise dissolved, optionally at a high temperature, in a second inert aprotic solvent (B) which is suitable for dissolving the amine, the solvent (B) being miscible with the solvent (A) and having a boiling point which is at least 30 DEG C higher than that of solvent (A) and a boiling point which is least 30 DEG C lower than that of the isocyanate to be prepared. The resultant amine solution is mixed with the phosgene solution at temperatures of between 10 and 60 DEG C, and the mixture reacted in known manner at between 130 and 200 DEG C by increasing the temperature.
    • 异氰酸酯是由可溶于氯苯和/或邻二氯苯中一组中的溶解的光气的伯胺包括氯苯和/或邻二氯苯的溶剂A较差的“冷 - 热光气化”产生,所述胺在第二对被转换 胺合适的惰性非质子溶剂B的溶液任选地也溶解在升高的温度,其中所述溶剂B为与溶剂可混溶的,并在至少30℃沸点高于所述溶剂中的,比要制备的异氰酸酯具有至少30℃的低沸点 ,与光气溶液中的胺这样制备的溶液在〜60℃的温度10混合,并将混合物通过提高在130的温度至200℃,以已知的方式来实现带来的。