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    Recovery of caprolactam from polycaprolactam
    3.
    发明授权
    Recovery of caprolactam from polycaprolactam 失效
    从己内酰胺中回收己内酰胺

    公开(公告)号：US5359062A

    公开(公告)日：1994-10-25

    申请号：US54064

    申请日：1993-04-29

    申请人： Hugo Fuchs ,  Gerald Neubauer ,  Josef Ritz ,  Claus-Ulrich Priester

    发明人： Hugo Fuchs ,  Gerald Neubauer ,  Josef Ritz ,  Claus-Ulrich Priester

    IPC分类号： C07D201/12 ,  C08G69/14

    CPC分类号： C07D201/12

    摘要： Caprolactam is recovered from polycaprolactam by hydrolyric cleavage of polycaprolactam with from 5 to 50 parts by weight of water per part by weight of polycaprolactam at from 200.degree. to 350.degree. C. under superatmospheric pressure to give an aqueous solution or suspension which contains monomeric caprolactam and oligomers thereof and may contain polycaprolactam and subsequent isolation of monomeric caprolactam from the aqueous solution or suspension by distillation or extraction, by a process in which the hydrolyric cleavage is carried out in the presence of an alkali metal hydroxide at a pH of from 5 to 10.

    摘要翻译： 己内酰胺通过在超大气压下在200-350℃下用5至50重量份的重量比的聚己内酰胺水解裂解聚己内酰胺从聚己内酰胺中回收，得到含有单体己内酰胺和 其低聚物并且可以含有聚己内酰胺并随后通过蒸馏或萃取从水溶液或悬浮液中分离单体己内酰胺，其中水解裂解在pH为5至10的碱金属氢氧化物存在下进行 。

    Recovery of caprolactam from oligomers and/or polymers of caprolactam
    6.
    发明授权
    Recovery of caprolactam from oligomers and/or polymers of caprolactam 失效
    从己内酰胺的低聚物和/或聚合物中回收己内酰胺

    公开(公告)号：US5700358A

    公开(公告)日：1997-12-23

    申请号：US396623

    申请日：1995-03-01

    申请人： Hugo Fuchs ,  Josef Ritz ,  Gerald Neubauer

    发明人： Hugo Fuchs ,  Josef Ritz ,  Gerald Neubauer

    IPC分类号： C07D201/12 ,  C07D201/16 ,  C08G69/14 ,  C08G69/46 ,  B01D3/34

    CPC分类号： C07D201/12 ,  C07D201/16

    摘要： Caprolactam is recovered from oligomers and/or polymers of caprolactam by cleavage of oligomers and/or polymers of caprolactam and subsequent working up by distillation of the caprolactam obtained in the cleavage, by a process including (a) cleaving oligomers and/or polymers of caprolactam to obtain an aqueous reaction mixture which contains caprolactam, (b) removing water from the reaction mixture obtained under (a) to obtain a residue, (c) distilling the residue obtained under (b) in an acidic medium and (d) then distilling the distillate in an alkaline medium to obtain caprolactam, or (c') distilling the residue obtained under (b) in an alkaline medium and (d') then distilling the distillate in an acidic medium to obtain caprolactam.

    摘要翻译： 通过裂解己内酰胺的低聚物和/或聚己内酯并随后通过蒸馏在切割中获得的己内酰胺来处理己内酰胺从己内酰胺的低聚物和/或聚合物中回收己内酰胺，方法包括（a）裂解己内酰胺的低聚物和/或聚合物 得到含有己内酰胺的水性反应混合物，（b）从（a）得到的反应混合物中除去水，得到残渣，（c）将酸性介质中的（b）得到的残渣蒸馏，然后蒸馏 在碱性介质中的馏出物得到己内酰胺，或（c'）将在（b）获得的残余物在碱性介质中蒸馏，然后（d'），然后在酸性介质中蒸馏出馏出物，得到己内酰胺。

    Work-up of aqueous mother liquors containing hydrochloric acid, sulfuric acid and their hydroxyl-ammonium and ammonium salts
    10.
    发明授权
    Work-up of aqueous mother liquors containing hydrochloric acid, sulfuric acid and their hydroxyl-ammonium and ammonium salts 失效
    含有氢氯酸，硫酸及其羟基铵和氨基铵的水性母液的加工

    公开(公告)号：US5124138A

    公开(公告)日：1992-06-23

    申请号：US631155

    申请日：1990-12-20

    申请人： Hugo Fuchs ,  Gerald Neubauer ,  Josef Ritz

    发明人： Hugo Fuchs ,  Gerald Neubauer ,  Josef Ritz

    IPC分类号： C01B21/14 ,  C02F1/26 ,  C07C249/08 ,  C07C251/44

    CPC分类号： C01B21/1472 ,  C02F1/26

    摘要： A process for working up aqueous mother liquors containing hydrochloric acid, sulfuric acid and their hydroxylammonium and ammonium salts, entails the mother liquors being intimately mixed with an excess of cyclohexanone based on the content of hydroxylammonium salts, while maintaining a pH of from 3 to 5.5 by adding alkali metal hydroxide solutions, and the cyclohexanone phase which contains cyclohexanone oxime being removed and washed with water until essentially free of chloride.

    摘要翻译： 处理含有盐酸，硫酸及其羟基铵和铵盐的含水母液的方法需要使母液基于羟基铵盐的含量与过量的环己酮充分混合，同时保持pH为3至5.5 通过加入碱金属氢氧化物溶液和除去环己酮肟的环己酮相，并用水洗涤至基本上不含氯化物。