Method for making caprolactam from impure 6-aminocapronitrile
    2.
    发明授权
    Method for making caprolactam from impure 6-aminocapronitrile 失效
    从不纯的6-氨基己腈制备己内酰胺的方法

    公开(公告)号:US07390897B2

    公开(公告)日:2008-06-24

    申请号:US11083715

    申请日:2006-02-10

    IPC分类号: C07D201/08

    CPC分类号: C07D223/10

    摘要: The invention relates to the field of production of lactams from aminonitriles, and in particular to the production of ε-caprolactam by the vapor phase hydrolytic cyclization of 6-aminocapronitrile. A crude liquid caprolactam comprising ε-caprolactam (CL), 6-aminocapronitrile (ACN) and water obtained from a vapor phase cyclization reaction of ACN is contacted with hydrogen in the presence of a hydrogenation catalyst to convert the ACN in the crude liquid caprolactam to a product comprising hexamethylenediamine (HMD) and hexamethyleneimine (HMI). Tetrahydroazepine (THA) in the crude liquid caprolactam is converted to HMI during this hydrogenation. The HMD and HMI have lower boiling points compared to ACN and thus they are more easily separated from CL in the subsequent distillation operations. Thus a process to make CL from ACN with fewer distillation stages, and with lower pressure drop and lower base temperature, is accomplished.

    摘要翻译: 本发明涉及由氨基腈生产内酰胺的领域,特别涉及通过6-氨基己腈的气相水解环化生产ε-己内酰胺。 包含ε-己内酰胺(CL),6-氨基己腈(ACN)和由ACN的气相环化反应获得的水的粗液体己内酰胺在氢化催化剂存在下与氢气接触,将粗液体己内酰胺中的ACN转化为 包含六亚甲基二胺(HMD)和六亚甲基亚胺(HMI)的产品。 粗制液体己内酰胺中的四氢吖庚因(THA)在该氢化期间转化为HMI。 与ACN相比,HMD和HMI具有较低的沸点,因此在随后的蒸馏操作中它们更容易与CL分离。 因此,实现了具有较少蒸馏阶段以及较低压降和较低基础温度的来自ACN的CL的方法。

    Process for making caprolactam
    3.
    发明授权
    Process for making caprolactam 失效
    制备己内酰胺的方法

    公开(公告)号:US07060820B1

    公开(公告)日:2006-06-13

    申请号:US11083728

    申请日:2005-03-18

    IPC分类号: C07D201/02

    CPC分类号: C07D201/08

    摘要: Lactams, in particular ε-caprolactam, are produced by the hydrolytic cyclization of aminonitriles, in particular 6-aminocapronitrile, in the vapor phase in a plurality of adiabatic fixed bed reaction zones arranged in succession wherein at least a portion of the heat of the exothermic reaction is removed between each of the successive reaction zones. Conducting the reaction in such a manner requires less capital for the reactor itself. It has also been found that the product exiting such a reaction system can be directly fed to a distillation unit without the need of additional cooling or storing.

    摘要翻译: 内酰胺,特别是ε-己内酰胺,是通过氨基腈,特别是6-氨基己腈在气相中水解环化生成的,所述多个绝热固定床反应区依次布置,其中放热的至少一部分热量 在每个连续反应区之间除去反应。 以这种方式进行反应需要较少的反应堆本身资本。 还已经发现,离开这种反应体系的产物可以直接进料到蒸馏装置,而不需要额外的冷却或储存。

    Production of 6-aminocaproic acid
    9.
    发明授权
    Production of 6-aminocaproic acid 有权
    生产6-氨基己酸

    公开(公告)号:US06372939B1

    公开(公告)日:2002-04-16

    申请号:US09713143

    申请日:2000-11-16

    IPC分类号: C07C20500

    摘要: A process for making 6-aminocaproic acid by hydroformylating 3-pentenenitrile to produce 3-, 4-, and 5-formylvaleronitrile (FVN mixture), oxidizing the FVN mixture to produce 3-, 4-, and 5-cyanovaleric acid; hydrogenating the resulting product to produce 6-aminocaproic acid, 5-amino-4-methylvaleric acid, and 4-amino-3-ethylbutyric acid; and isolating 6-aminocaproic acid from the reaction product. The resulting 6-aminocaproic acid can be cyclized to produce caprolactam.

    摘要翻译: 通过加氢甲酰化3-戊烯腈生产3-,4-和5-甲酰基戊腈(FVN混合物)制备6-氨基己酸的方法,氧化FVN混合物以产生3-,4-和5-氰基戊酸; 氢化所得产物以产生6-氨基己酸,5-氨基-4-甲基戊酸和4-氨基-3-乙基丁酸; 并从反应产物中分离出6-氨基己酸。 所得6-氨基己酸可以环化以制备己内酰胺。