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    • 12. 发明申请
    • Method for avoiding corrosion
    • 避免腐蚀的方法
    • US20060243584A1
    • 2006-11-02
    • US10572783
    • 2004-09-24
    • Werner ReutemannTheodor WeberKarl-Heinz RossManfred Julius
    • Werner ReutemannTheodor WeberKarl-Heinz RossManfred Julius
    • B01D3/34
    • C07C211/04C07C209/86Y10S203/20Y10S203/24
    • The invention relates to a method of avoiding corrosion in the separation of methylamine from a product stream (10) which is obtained in the preparation of methylamines by gas-phase reaction of methanol and ammonia and comprises monomethylamine, dimethylamine, trimethylamine, ammonia and methanol as components, where ammonia is separated off by pure distillation in a first column (1), the remaining components of the product stream obtained as bottoms (12) are fed to a second column (2). Trimethylamine (14) is separated off in the second column (2) by extractive distillation with introduction of water. The further components of the product stream obtained as bottoms (15) from the second column (2) are fed to a third column (3), in which monomethylamine and dimethylamine are separated off at the top. The monomethylamine and dimethylamine are separated by distillation in a fourth column (4). To avoid corrosion alkali metal hydroxide is added to the second or third column (3).
    • 本发明涉及一种避免在从甲醇和氨气相反应制备甲胺中得到的产物流(10)中甲胺分离腐蚀的方法,包括一甲胺,二甲胺,三甲胺,氨和甲醇 组分,其中在第一塔(1)中通过纯蒸馏分离氨,将作为塔底物(12)获得的产物流的剩余组分进料至第二塔(2)。 通过萃取蒸馏引入三水胺(14)在第二塔(2)中分离。 从第二塔(2)获得的作为塔底物(15)获得的产物流的其它组分进料到第三塔(3),其中一甲胺和二甲胺在顶部分离。 在第四列(4)中通过蒸馏分离一甲胺和二甲胺。 为了避免腐蚀,将碱金属氢氧化物加入到第二或第三塔(3)中。