中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

117 records (took 0.046 seconds)

    Production of caprolactam
    83.
    发明授权
    Production of caprolactam 失效
    生产CAPROLACTAM

    公开(公告)号：US3676431A

    公开(公告)日：1972-07-11

    申请号：US3676431D

    申请日：1968-05-21

    Applicant: BP CHEM INT LTD

    Inventor： CAPP CLIFFORD WILLIAM ,  DENBIGH KEITH WARWICK

    IPC: C07D201/02 ,  C07D41/06

    CPC classification number: C07D201/02

    Abstract: In the production of caprolactam by reaction of 1,1''peroxydicyclohexylamine with alkali metal alkoxides, the reaction is carried out in a reaction medium which is a mixture of methanol and dimethylsulphoxide.

    Abstract translation: 在通过1,1'-过氧二环己基胺与碱金属醇盐的反应生产己内酰胺时，反应在作为甲醇和二甲基亚砜的混合物的反应介质中进行。

    Process for the purification of lactams
    89.
    发明授权
    Process for the purification of lactams 有权
    内酰胺纯化方法

    公开(公告)号：US08231765B2

    公开(公告)日：2012-07-31

    申请号：US12155065

    申请日：2008-05-29

    Applicant: Daniel Amoros ,  Philippe Leconte ,  Pierre Coqueret

    Inventor： Daniel Amoros ,  Philippe Leconte ,  Pierre Coqueret

    IPC: B01D3/34 ,  C07D201/02 ,  C07D201/16

    CPC classification number: C07D201/16 ,  C07D201/08 ,  Y10S203/90

    Abstract: A method and a plant are disclosed for purifying lactams, particularly lactams obtained by cyclizing hydrolysis of aminonitrile. The purification of ε-caprolactam obtained by cyclizing hydrolysis of aminocapronitrile is described which includes eliminating the ammonia from the reaction medium of the hydrolysis, then recovering the lactam from the medium in purified form. The recovery is carried out by performing at least a distillation of the lactam in the presence of a base producing optionally a fronts fraction having compounds more volatile than the lactam, a fraction having the lactam to be recovered to the degree of desired purity and a distillation tails having the lactam and compounds less volatile than the lactam. The distillation tails are treated by various processes such as evaporation in thin layers to recover the major part of the caprolactam and recycling the latter in the purification process.

    Abstract translation: 公开了一种用于纯化内酰胺，特别是通过环化氨基腈水解获得的内酰胺的方法和设备。 描述了通过环化氨基腈的水解获得的ε-己内酰胺的纯化，其包括从水解反应介质中除去氨，然后以纯化形式从培养基中回收内酰胺。 回收是通过在碱的存在下进行至少一种蒸馏来进行的，所述碱生产任选地具有比内酰胺更易挥发的化合物的前端部分，具有待回收的内酰胺至具有所需纯度的馏分和蒸馏 尾巴具有内酰胺和化合物比内酰胺更不易挥发。 蒸馏尾部通过各种方法处理，例如在薄层中蒸发以回收大部分己内酰胺并在纯化过程中回收己内酰胺。

    Method for making caprolactam from impure 6-aminocapronitrile
    90.
    发明申请
    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：US20080009618A9

    公开(公告)日：2008-01-10

    申请号：US11083715

    申请日：2005-03-18

    Applicant: Alan Allgeier ,  John Ostermaier ,  Sourav Sengupta

    Inventor： Alan Allgeier ,  John Ostermaier ,  Sourav Sengupta

    IPC: C07D201/02

    CPC classification number: C07D223/10

    Abstract: 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-caprolactarn (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.

    Abstract translation: 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-己内酯（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。

Patent Agency Ranking