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发明公开
CN105658618A 催化剂制备和氢化方法 无效 - 撤回

催化剂制备和氢化方法
摘要：
披露一种使如己二腈的二腈在氨存在下氢化形成如六亚甲基二胺的二胺的方法。还披露一种通过用氢气还原氧化铁来制备用于这个氢化反应的催化剂的方法。在三个蒸馏步骤中从氨和二胺的液体混合物中分离出无水氨。在这三个蒸馏步骤的过程中，所述液体的压力从例如500psig(3,549kPa)降低到例如2psig(115kPa)。回收从氨和二胺的液体混合物中分离的所述无水氨并且其可以再循环到所述氢化反应。
摘要（英）：

Disclosed is a method for hydrogenating a dinitrile, such as adiponitrile, in the presence of ammonia to form a diamine, such as hexamethylenediamine. Also disclosed is a method for preparing a catalyst for this hydrogenation reaction by reducing iron oxide with hydrogen. Anhydrous ammonia is separated from a liquid mixture of ammonia and diamine in three distillation steps. The pressure of the liquid is reduced from, for example, 500 psig (3,549 kPa) to, for example, 2 psig (115 kPa), over the course of these three distillation steps. The anhydrous ammonia, which is separated from liquid mixture of ammonia and diamine is recovered and may be recycled to the hydrogenation reaction.

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