公开(公告)号：US5948908A

公开(公告)日：1999-09-07

申请号：US617448

申请日：1996-03-18

Applicant: Stylianos Sifniades ,  Alan Bart Levy

Inventor： Stylianos Sifniades ,  Alan Bart Levy

IPC: C07D201/12 ,  C07D201/16

CPC classification number: C07D201/16 ,  C07D201/12

Abstract: The present invention provides an improved process for the recovery of caprolactam from polycaprolactam processing waste. The present process for depolymerizing polycaprolactam waste to form caprolactam comprises the step of: in the absence of added catalyst, contacting the polycaprolactam waste with superheated steam at a temperature of about 250.degree. C. to about 400.degree. C. and at a pressure within the range of about 1.5 atm to about 100 atm and substantially less than the saturated vapor pressure of water at the temperature wherein a caprolactam-containing vapor stream is formed.

Abstract translation: 本发明提供了从聚己内酰胺处理废物中回收己内酰胺的改进方法。 用于解聚聚己内酰胺废物形成己内酰胺的本发明方法包括以下步骤：在不加入催化剂的情况下，在约250℃至约400℃的温度和 范围为约1.5atm至约100atm，并且在其中形成含己内酰胺的蒸汽流的温度下，基本上小于饱和的水蒸气压。

公开(公告)号：US5919927A

公开(公告)日：1999-07-06

申请号：US58403

申请日：1998-04-09

Applicant: Luc Moens

Inventor： Luc Moens

IPC: C07D223/04 ,  C08G69/16 ,  C07D201/16

CPC classification number: C07D223/04 ,  C08G69/16

Abstract: A method of removing 1,11-diamino-6-undecanone from the pyrolysis product of nylon comprising: a) pyrolyzing nylon-6 to form a pyrolyzate containing a caprolactam mixture;b) dissolving the caprolactam mixture in a solvent to form a solution;c) passing carbon dioxide gas through the solution to form a precipitate;d) removing the precipitate from the solution; ande) recovering the purified caprolactam from the solution.

Abstract translation: 从尼龙热解产物中除去1,11-二氨基-6-十一烷酮的方法，包括：a）将尼龙-6热解形成含有己内酰胺混合物的热解物; b）将己内酰胺混合物溶解在溶剂中以形成溶液; c）使二氧化碳气体通过溶液形成沉淀物; d）从溶液中除去沉淀物; 和e）从溶液中回收纯化的己内酰胺。

公开(公告)号：US5693793A

公开(公告)日：1997-12-02

申请号：US707476

申请日：1996-09-05

Applicant: Josef Ritz ,  Eberhard Fuchs ,  Guido Voit ,  Gunther Achhammer ,  Rolf Fischer

Inventor： Josef Ritz ,  Eberhard Fuchs ,  Guido Voit ,  Gunther Achhammer ,  Rolf Fischer

IPC: C07C231/06 ,  C07C237/06 ,  C07C253/00 ,  C07C255/24 ,  C07D201/08 ,  C07D201/12 ,  C07D201/16

CPC classification number: C07D201/12 ,  C07D201/08

Abstract: A process for preparing caprolactam by cyclization of 6-aminocapronitrile in the presence of water at elevated temperature and in the presence or absence of a catalyst and a solvent, comprises a) removing from the cyclization reaction effluent ("reaction effluent I") caprolactam and all components boiling higher than caprolactam ("high boilers"), b) treating the high boilers of stage a) with phosphoric acid and/or polyphosphoric acid at from 200 to 350.degree. C. to obtain a reaction effluent II, and c) removing caprolactam formed and any 6-aminocapronitrile from reaction effluent II of stage b) to obtain separation from unconverted high boilers and acid used.

Abstract translation: 在高温存在下和在存在或不存在催化剂和溶剂的情况下，通过6-氨基己腈的环化制备己内酰胺的方法包括：a）从环化反应流出物（“反应流出物I”）中除去己内酰胺和 所有组分沸点高于己内酰胺（“高锅炉”），b）用磷酸和/或多磷酸在200至350℃下处理阶段a）的高锅炉以获得反应流出物II，和c）除去 己内酰胺和来自阶段b）的反应流出物II的任何6-氨基己腈得到与未转化的高锅炉和酸的分离。

公开(公告)号：US5556890A

公开(公告)日：1996-09-17

申请号：US253010

申请日：1994-06-02

Applicant: Antoon H. T. Halderit ,  Martin Booij ,  Jan A. J. Hendrix ,  Yvonne H. Frentzen

Inventor： Antoon H. T. Halderit ,  Martin Booij ,  Jan A. J. Hendrix ,  Yvonne H. Frentzen

IPC: C07D201/12 ,  C07D201/16 ,  C08J11/14

CPC classification number: C07D201/12 ,  C07D201/16

Abstract: The present invention is for a method of preparing purified .epsilon.-caprolactam from carpet waste containing nylon-6. Contaminated .epsilon.-caprolactam is obtained by depolymerizing nylon-6 from carpet waste. A mixture of the contaminated .epsilon.-caprolactam and water is then hydrogenated in the presence of hydrogen and a hydrogenation catalyst in order to produce purified .epsilon.-caprolactam. The amount of contaminated .epsilon.-caprolactam in the mixture can be between 10 and 95% by weight.

Abstract translation: 本发明涉及从含有尼龙-6的地毯废物中制备纯化的ε-己内酰胺的方法。 通过从地毯废物中解聚尼龙-6得到受污染的ε-己内酰胺。 然后将污染的ε-己内酰胺和水的混合物在氢气和氢化催化剂的存在下氢化，以产生纯化的ε-己内酰胺。 混合物中受污染的ε-己内酰胺的量可以在10至95重量％之间。

公开(公告)号：US5525725A

公开(公告)日：1996-06-11

申请号：US293180

申请日：1994-08-19

Applicant: Yasuhiko Higashio ,  Hiroshi Kajikuri ,  Keisuke Sugita ,  Hideki Doi ,  Masanobu Matsubara

Inventor： Yasuhiko Higashio ,  Hiroshi Kajikuri ,  Keisuke Sugita ,  Hideki Doi ,  Masanobu Matsubara

IPC: C07D201/16 ,  C07D201/04 ,  C07D201/06

CPC classification number: C07D201/16

Abstract: A process for producing a high purity caprolactam is disclosed in which a crude caprolactam obtained by a catalytic rearrangement of cyclohexanone oxime is subjected(1) to mixing, while stirring, with at least one hydrocarbon selected from the group consisting of aliphatic hydrocarbons and alicyclic hydrocarbons to form a liquid-liquid, two-layer liquid mixture, and then crystallizing caprolactam out of the liquid mixture;(2) to mixing with both at least one hydrocarbon selected from the group consisting of aliphatic hydrocarbons and alicyclic hydrocarbons, and water to form a liquid mixture, separating the liquid mixture into a hydrocarbon layer and a water layer, and then recovering caprolactam from the water layer; or(3) to distillation in the co-presence of at least one aliphatic saturated hydrocarbon of 10 to 18 carbon atoms.

公开(公告)号：US5440032A

公开(公告)日：1995-08-08

申请号：US712442

申请日：1991-06-10

Applicant: Kazuhiko Hirosawa ,  Yasuhiro Kurokawa ,  Tomohiko Yamamoto ,  Masaru Matsunishi ,  Yoshihiro Nawata

Inventor： Kazuhiko Hirosawa ,  Yasuhiro Kurokawa ,  Tomohiko Yamamoto ,  Masaru Matsunishi ,  Yoshihiro Nawata

IPC: C07D201/16

CPC classification number: C07D201/16

Abstract: Disclosed is a method for purifying a lactam-containing organic solution which comprises processing an organic solution containing at least one lactam with an anion exchange resin to remove an anionic surface active substance contained in said organic solution, and then extracting with water to separate an objective component contained in the organic solution to an aqueous solution.

Abstract translation: 公开了一种纯化含内酰胺的有机溶液的方法，其包括用阴离子交换树脂处理含有至少一种内酰胺的有机溶液以除去所述有机溶液中所含的阴离子表面活性物质，然后用​​水萃取以分离目标 有机溶液中所含的成分与水溶液的比例。

公开(公告)号：US5245029A

公开(公告)日：1993-09-14

申请号：US792413

申请日：1991-11-15

Applicant: Yukio Inaba ,  Yasuhiro Kurokawa ,  Takafumi Hirakawa ,  Kanji Oyama

Inventor： Yukio Inaba ,  Yasuhiro Kurokawa ,  Takafumi Hirakawa ,  Kanji Oyama

IPC: C07D223/10 ,  C07D201/04 ,  C07D201/16

CPC classification number: C07D201/16

Abstract: Disclosed is an ion exchange purification method of an aqueous caprolactam solution in a process for producing caprolactam and laurolactam by subjecting a mixture of cyclohexanone oxime and cyclododecanone oxime to Beckmann rearrangement in the presence of sulfuric acid and fuming sulfuric acid, which comprises, after neutralization of the rearrangement reaction products, and first extraction thereof with an organic solvent and second extraction of the first extract with water to obtain a second extract of an aqueous caprolactam solution, treating the aqueous caprolactam solution obtained by extraction with an organic solvent immiscible with water with a strongly acidic cation exchange resin, and subsequently with a weakly basic anion exchange resin or further with a strongly basic anion exchange resin.

Abstract translation: 公开了在硫酸和发烟硫酸的存在下，使环己酮肟和环十二烷酮肟的混合物进行贝克曼重排以制备己内酰胺和月桂内酰胺的方法中的己内酰胺水溶液的离子交换纯化方法， 重排反应产物，首先用有机溶剂萃取，用水萃取第二提取物，得到第二次己内酰胺水溶液，用与水不混溶的有机溶剂萃取得到的己内酰胺水溶液 强酸性阳离子交换树脂，随后用弱碱性阴离子交换树脂或强碱性阴离子交换树脂。

公开(公告)号：US5241066A

公开(公告)日：1993-08-31

申请号：US904223

申请日：1992-06-25

Applicant: Edward A. Davis ,  Jack A. Dellinger

Inventor： Edward A. Davis ,  Jack A. Dellinger

IPC: C07D201/12 ,  C07D201/16

CPC classification number: C07D201/16 ,  C07D201/12

Abstract: A process for recovering caprolactam from waste containing both polycaprolactam and materials which are insoluble in acidic solvents for polycaprolactam includes agitating the waste in an acidic solvent capable of dissolving polycaprolactam without degrading the acid insoluble materials, separating the solution containing polycaprolactam from the acid insoluble materials, feeding the solution containing the polycaprolactam to a depolymerization reactor, without substantially precipitating the polycaprolactam and depolymerizing the polycaprolactam solution to obtain substantially pure caprolactam.

公开(公告)号：US5032684A

公开(公告)日：1991-07-16

申请号：US551790

申请日：1990-07-12

Applicant: Gerald Neubauer ,  Josef Ritz ,  Hugo Fuchs ,  David Agar ,  Rolf Fischer ,  Uwe Vagt

Inventor： Gerald Neubauer ,  Josef Ritz ,  Hugo Fuchs ,  David Agar ,  Rolf Fischer ,  Uwe Vagt

IPC: C07D223/10 ,  C07D201/16

CPC classification number: C07D201/16

Abstract: Caprolactam is purified continuously by passing a 75-95% strength by weight aqueous caprolactam solution together with hydrogen at 50.degree.-95.degree. C. and 1.5-100 bar upward through a fixed-bed supported palladium or nickel catalyst in a tubular zone while maintaining a residence time of from 10 to 100 min.

Abstract translation: 通过将75-95％的重量比的己内酰胺水溶液与氢在-50-95℃和1.5-100巴上通过固定床负载的钯或镍催化剂在管状区域中连续纯化，同时保持己内酰胺 停留时间为10至100分钟。

公开(公告)号：US4892624A

公开(公告)日：1990-01-09

申请号：US236215

申请日：1988-08-25

Applicant: Hugo Fuchs

Inventor： Hugo Fuchs

IPC: C07D201/16

CPC classification number: C07D201/16

Abstract: Distillation residues from the purification of caprolactam are worked up by heating in the presence of sodium hydroxide or potassium hydroxide and in the presence of a high-boiling hydrocarbon at from 250.degree. to 500.degree. C. and continuously removing the caprolactam.

Abstract translation: 通过在氢氧化钠或氢氧化钾存在下加热并在250-500℃的高沸点烃的存在下加热己内酰胺纯化的蒸馏残留物，并连续除去己内酰胺。