中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

15 records (took 0.011 seconds)

    Continuous preparation of cyclohexanone oxime
    1.
    发明授权
    Continuous preparation of cyclohexanone oxime 失效
    CYCLOHEXANONE OXIME连续制备

    公开(公告)号：US3862230A

    公开(公告)日：1975-01-21

    申请号：US42271273

    申请日：1973-12-07

    Applicant: STAMICARBON

    Inventor： DE ROOIJ ABRAHAM H ,  ELMENDORP JAN

    IPC: C07C131/04

    Abstract: A process for the continuous preparation of an oxime from cyclohexanone and an aqueous buffered solution of a hydroxylammonium salt together with free phosphoric acid, phosphates, nitrates, and optionally sulphates all in controlled amounts and without the use of an organic solvent is disclosed. The resulting aqueous reaction mixture contains a manageable amount of unreacted cyclohexanone which is subsequently recovered and recirculated.

    Abstract translation: 公开了一种从环己酮和羟基铵盐连续制备肟的方法以及游离磷酸，磷酸盐，硝酸盐和任选的硫酸盐，其全部以受控量和不使用有机溶剂。 所得的含水反应混合物含有可处理量的未反应的环己酮，随后回收并再循环。

    Process for recovery of lactam
    6.
    发明授权
    Process for recovery of lactam 失效
    回收内酰胺的方法

    公开(公告)号：US3879380A

    公开(公告)日：1975-04-22

    申请号：US31363872

    申请日：1972-12-11

    Applicant: STAMICARBON

    Inventor： DE ROOIJ ABRAHAM H ,  GOETTSCH REIJER

    IPC: B01D11/04 ,  B01D9/02 ,  C07D201/04 ,  C07D201/16 ,  C07D41/06

    CPC classification number: C07D201/16 ,  C07D201/04

    Abstract: A process for recovering lactams from a mixture of one or more lactams and sulphuric acid is disclosed, wherein the sulphuric acid is neutralized with ammonia or an ammonium salt to ammonium hydrogen sulfate in the presence of a lactam solvent. The neutralization produces a melt of ammonium hydrogen sulfate and a solution of lactam in the organic solvent, and the melt is readily separated from the solution. The lactam can then be recovered from the organic solvent. The process allows the lactam to be recovered in good yield without producing, as by-product, ammonium sulfate.

    Abstract translation: 公开了一种从一种或多种内酰胺和硫酸的混合物中回收内酰胺的方法，其中硫酸在内酰胺溶剂存在下用氨或铵盐中和至硫酸氢铵。 中和产生硫酸氢铵的熔体和内酰胺在有机溶剂中的溶液，并且熔体容易从溶液中分离出来。 然后可以从有机溶剂中回收内酰胺。

    Process for recovery of {68 -caprolactam from a reaction mixture of {68 -caprolactam and sulphuric acid
    9.
    发明授权
    Process for recovery of {68 -caprolactam from a reaction mixture of {68 -caprolactam and sulphuric acid 失效
    从{68-己内酰胺和硫酸的反应混合物中回收{68-己内酰胺的方法

    公开(公告)号：US3907781A

    公开(公告)日：1975-09-23

    申请号：US48260174

    申请日：1974-06-24

    Applicant: STAMICARBON

    Inventor： DE ROOIJ ABRAHAM H ,  ELMENDORP JAN

    IPC: C01C1/24 ,  C01C1/242 ,  C05C3/00 ,  C07D201/16 ,  C07D201/18

    CPC classification number: C07D201/16 ,  E05Y2900/104

    Abstract: Epsilon -CAPROLACTAM IS RECOVERED FROM A Beckmann rearrangement mixture of the lactam and aqueous sulfuric acid by simultaneously neutralizing the rearrangement mixture with ammonia at a pressure of 1-5 atmospheres and crystallizing out ammonium sulfate, the heat liberated by the neutralization reaction is removed from the system by evaporating a portion of the water from the solution. At the conditions employed hydrolysis of the lactam is substantially reduced if not entirely avoided.

    Abstract translation: 通过在1-5个大气压的压力下同时用氨中和重排混合物并结晶出硫酸铵，将ε-CAPROLACTAM从内酰胺和硫酸水溶液的贝克曼重排混合物中回收，中和反应释放的热量从 系统通过从溶液中蒸发一部分水。 在使用条件下，如果不完全避免，内酰胺的水解将显着降低。

Patent Agency Ranking