Process for preparation of aliphatic diisocyanate compounds
    2.
    发明授权
    Process for preparation of aliphatic diisocyanate compounds 失效
    脂族二异氰酸酯化合物的制备方法

    公开(公告)号:US5789614A

    公开(公告)日:1998-08-04

    申请号:US940364

    申请日:1997-09-30

    IPC分类号: C07C269/04 C07C263/00

    CPC分类号: C07C269/04

    摘要: An aliphatic diisocyante compound is prepared in a high yield by reacting dimethyl carbonate with an aliphatic diamine in the presence of an alkali catalyst to produce a corresponding urethene compound; and, within 48 hours after the completion of the preparation of the urethane compound, thermally decomposing the urethane compound under a reduced pressure of 1 to 700 Torr in a high-boiling-point solvent.

    摘要翻译: 通过在碱催化剂的存在下使碳酸二甲酯与脂肪族二胺反应,以高产率制备脂族二异氰酸酯化合物,生成相应的脲基化合物; 在氨基甲酸酯化合物的制备完成后48小时内,在高沸点溶剂中,在1〜700乇的减压下热分解氨基甲酸酯化合物。

    Process for preparation of isocyanate compounds
    3.
    发明授权
    Process for preparation of isocyanate compounds 失效
    异氰酸酯化合物的制备方法

    公开(公告)号:US5773643A

    公开(公告)日:1998-06-30

    申请号:US358680

    申请日:1994-12-19

    摘要: A diisocyanate compound substantially free from chlorine is prepared by the following consecutive steps (1), (2) and (3): (1) preparing dimethyl carbonate by a method selected from: (a) a method wherein carbon monoxide and oxygen are reacted with methanol, (b) a method wherein propylene oxide is reacted with carbon dioxide to prepare propylene carbonate, and then, the propylene carbonate is reacted with methanol, and (c) a method wherein a nitrous acid ester is catalytically reacted with carbon monoxide; (2) reacting the dimethyl carbonate with an aliphatic diamine in the presence of an alkali catalyst to prepare a corresponding urethane compound; and (3) thermally decomposing the urethane compound under a reduced pressure of 1 to 700 Torr in a high-boiling point solvent.

    摘要翻译: 通过以下连续步骤(1),(2)和(3)制备基本上不含氯的二异氰酸酯化合物:(1)通过选自以下的方法制备碳酸二甲酯:(a)一氧化碳和氧气反应的方法 (b)使环氧丙烷与二氧化碳反应制备碳酸丙烯酯的方法,然后使碳酸亚丙酯与甲醇反应,和(c)亚硝酸酯与一氧化碳催化反应的方法; (2)在碱催化剂存在下使碳酸二甲酯与脂肪族二胺反应,制备相应的氨基甲酸酯化合物; 和(3)在高沸点溶剂中在1〜700托的减压下热分解氨基甲酸酯化合物。