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    • 5. 发明专利
    • METHOD FOR PRODUCING ε-CAPROLACTAM
    • 生产ε-CAPROLACTAM的方法
    • JP2011201865A
    • 2011-10-13
    • JP2011042504
    • 2011-02-28
    • Sumitomo Chemical Co Ltd住友化学株式会社
    • NAGAMI HIDETO
    • C07D201/16C07B61/00
    • C07D201/16C07D223/10
    • PROBLEM TO BE SOLVED: To provide a method for producing ε-caprolactam, which produces high-quality ε-caprolactam containing less impurity in a high yield.
      SOLUTION: The method for producing ε-caprolactam includes an ε-caprolactam purification step A for obtaining purified ε-caprolactam from raw ε-caprolactam by applying a drop crystallization method, a first-stage ε-caprolactam recovery B for obtaining first recovered ε-caprolactam and a first recovered mother liquor by applying an evaporative crystallization method to a crystallization mother liquor obtained in the ε-caprolactam polymerization step A and a second-stage ε-caprolactam recovery step C for obtaining second recovered purified ε-caprolactam by applying a melt crystallization method to the first recovered mother liquor, first recovered ε-caprolactam being recovered as a raw material for the ε-caprolactam purification step A and second recovered purified ε-caprolactam being recovered as a raw material for the ε-caprolactam purification step A and/or the first-stage ε-caprolactam recovery step B.
      COPYRIGHT: (C)2012,JPO&INPIT
    • 8. 发明专利
    • METHOD FOR PRODUCING ε-CAPROLACTAM
    • 生产ε-CAPROLACTAM的方法
    • JP2008308461A
    • 2008-12-25
    • JP2007159462
    • 2007-06-15
    • Sumitomo Chemical Co Ltd住友化学株式会社
    • CHO TAKESHIYOKOTA MASASHI
    • C07D201/16B01D9/02B01F15/00C07D223/10
    • PROBLEM TO BE SOLVED: To provide a method for producing ε-caprolactam in which adhesion of scaling to an agitating rod is suppressed and crystallization is industrially continuously carried out when obtaining high-quality lactam by purifying a crude ε-caprolactam by a crystallization method.
      SOLUTION: The method for producing ε-caprolactam comprises introducing a crude ε-caprolactam together with a mixed solvent of n-heptane with cyclohexane in a liquid phase state into a container equipped with an agitating means composed of agitating blades and an agitating rod for rotating and driving the agitating blades and crystallizing ε-caprolactam while agitating. The surface of the agitating rod is composed of a buffed-finish stainless steel or a fluororesin.
      COPYRIGHT: (C)2009,JPO&INPIT
    • 解决问题的方法:提供一种制备ε-己内酰胺的方法,其中通过将粗ε-己内酰胺纯化得到高质量的内酰胺,通过抑制粗ε-己内酰胺得到高质量的内酰胺,其中抑制了对搅拌棒的结垢的粘附和工业上的结晶 结晶法。 解决方案:ε-己内酰胺的制造方法包括将粗ε-己内酰胺与正庚烷与环己烷的液相状态的混合溶剂一起引入配备有由搅拌叶片和搅拌叶片组成的搅拌装置的容器中 用于旋转和驱动搅拌叶片并在搅拌下结晶ε-己内酰胺。 搅拌棒的表面由抛光不锈钢或氟树脂组成。 版权所有(C)2009,JPO&INPIT
    • 9. 发明专利
    • REFINING METHOD OF RECOVERED ε-CAPROLACTAM
    • 恢复的epsi-CAPROLACTAM的精制方法
    • JP2008056620A
    • 2008-03-13
    • JP2006237078
    • 2006-08-31
    • Toray Ind Inc東レ株式会社
    • KATSURAGI HIDEFUSAONO TAKAE
    • C07D201/16C07D223/10
    • PROBLEM TO BE SOLVED: To provide a method of industrially and advantageously obtaining a high purity recovered ε-caprolactam which is improved in color and can be used as a raw material for nylon 6 by repeating simple distillation of the recovered ε-caprolactam at least twice in the presence of a basic additive.
      SOLUTION: In this refining method of ε-caprolactam, a single distillation of ε-caprolactam is repeated at least twice in the presence of a basic additive by adding at least a basic additive selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, alkali metal bicarbonates, alkaline earth metal hydroxides, alkaline earth metal carbonates, and alkaline earth metal bicarbonates.
      COPYRIGHT: (C)2008,JPO&INPIT
    • 要解决的问题:提供一种工业上有利地获得高纯度回收的ε-己内酰胺的方法,该ε-己内酰胺的颜色得到改善,并且可以通过重复简单蒸馏回收的ε-己内酰胺,将其用作尼龙6的原料 在碱性添加剂存在下至少两次。 解决方案:在这种ε-己内酰胺的精制方法中,在碱性添加剂的存在下,将ε-己内酰胺的单次蒸馏重复至少两次,至少加入选自碱金属氢氧化物, 碱金属碳酸盐,碱金属碳酸氢盐,碱土金属氢氧化物,碱土金属碳酸盐和碱土金属碳酸氢盐。 版权所有(C)2008,JPO&INPIT
    • 10. 发明专利
    • Method for purifying caprolactam
    • 净化CAPROLACTAM的方法
    • JP2007223906A
    • 2007-09-06
    • JP2006043462
    • 2006-02-21
    • Sumitomo Chemical Co Ltd住友化学株式会社
    • YOKOTA MASASHIKOBAYASHI YOSHINORICHO TAKESHI
    • C07D201/16C07D223/10
    • PROBLEM TO BE SOLVED: To provide an economical method for purifying caprolactam by which deposition of cyclohexanone oxime, etc., in a condenser is suppressed and the deterioration of heat efficiency or clogging is suppressed to condense and separate low-boiling components from crude caprolactam without requiring equipment such as brine cooling.
      SOLUTION: The method for purifying the caprolactam is characterized as follows. A distillation column, a first condenser, a second condenser, a dry type vacuum pump and a third condenser are made to communicate and arranged in order. The distillation column, the first condenser and the second condenser are evacuated by suction with the dry type vacuum pump. The crude caprolactam is fed to the distillation column and distilled. The caprolactam containing high-boiling components is separated from the column bottom and a gas distilled from the distillation column is condensed at 70-100°C temperature in the first condenser. An un-condensed gas in the first condenser is brought into contact with a cooled liquid of the condensate of the second condenser and condensed in the second condenser. The un-condensed gas in the second condenser is condensed through the dry type vacuum pump in the third condenser to separate the low-boiling components in the crude caprolactam.
      COPYRIGHT: (C)2007,JPO&INPIT
    • 待解决的问题:提供一种经济的纯化己内酰胺的方法,其中抑制了冷凝器中的环己酮肟等的沉积,并且抑制了热效率或堵塞的劣化,以将低沸点组分从 粗己内酰胺,无需盐水冷却等设备。 解决方案:纯化己内酰胺的方法的特征如下。 蒸馏塔,第一冷凝器,第二冷凝器,干式真空泵和第三冷凝器被依次连通和排列。 蒸馏塔,第一冷凝器和第二冷凝器用干式真空泵抽吸抽真空。 将粗己内酰胺加入蒸馏塔并蒸馏。 含有高沸点组分的己内酰胺与塔底分离,从蒸馏塔蒸馏的气体在第一冷凝器中在70-100℃温度下冷凝。 第一冷凝器中的未冷凝的气体与第二冷凝器的冷凝液的冷却液接触,并在第二冷凝器中冷凝。 第二冷凝器中的未冷凝气体通过第三冷凝器中的干式真空泵冷凝,以分离粗己内酰胺中的低沸点组分。 版权所有(C)2007,JPO&INPIT