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    • 7. 发明授权
    • Process for producing diamines
    • 二胺生产方法
    • US06696609B2
    • 2004-02-24
    • US10377828
    • 2003-03-04
    • Yoshihiro TokudaShigeaki Suzuki
    • Yoshihiro TokudaShigeaki Suzuki
    • C07C2926
    • C07C209/26C07C2603/80C07C211/09C07C211/12C07C211/19
    • A process for producing diamines which comprises the steps of: (1) reacting a dialdehyde with ammonia and hydrogen in the presence of an alcohol and a hydrogenation catalyst to synthesize the corresponding diamine; (2) separating and recovering the alcohol by distilling the reaction mixture obtained by the step (1); (3) separating the diamine by purifying the distillation residue obtained by the step (2); and (4) feeding at least part of the alcohol recovered in the step (2) to step (1); said step (1) comprising maintaining the amount of ammonia at a level of at least 200 moles per mole of the primary amine that has formed in the step (1) and accumulated in the reaction vessel for step (1). The process can produce diamines commercially advantageously and in high yields, the diamines having little impurities.
    • 一种制备二胺的方法,包括以下步骤:(1)在醇和氢化催化剂存在下使二醛与氨和氢反应,合成相应的二胺; (2)通过蒸馏由步骤(1)获得的反应混合物来分离和回收醇; (3)通过纯化由步骤(2)获得的蒸馏残余物来分离二胺; 和(4)将步骤(2)中回收的醇的至少一部分进料至步骤(1); 所述步骤(1)包括将氨的量保持在步骤(1)中形成并累积在步骤(1)的反应容器中的每摩尔伯胺至少200摩尔的水平。 该方法可以有利地和高产率地生产二胺,二胺几乎没有杂质。