公开(公告)号：US20020058808A1

公开(公告)日：2002-05-16

申请号：US09934679

申请日：2001-08-23

Inventor： Peter W.H. Cheng ,  Jan A.J. Hendrix ,  Leonardus J.G. Raets

IPC: C07D223/10

CPC classification number: C07D201/12 ,  C07D201/16

Abstract: The present invention relates to a process for purifying an impure stream of caprolactam while recovering not only pure caprolactam but also medium-to-high pressure steam. Preferably, the stream of impure or crude caprolactam, which comprises at a minimum a substantial portion of water, is obtained from depolymerization of a polyamide-containing composition. The resulting purified caprolactam will have a purity greater than 90 weight percent and the recovered steam will have a temperature sufficiently high to provide a driving force for use with other equipment, for instance, heat exchange equipment.

公开(公告)号：US06342555B2

公开(公告)日：2002-01-29

申请号：US09759444

申请日：2001-01-12

Applicant: Stylianos Sifniades ,  Alan Bart Levy ,  Jan Agnes Jozef Hendrix

Inventor： Stylianos Sifniades ,  Alan Bart Levy ,  Jan Agnes Jozef Hendrix

IPC: C08K326

CPC classification number: C07D201/12

Abstract: The present invention provides an efficient process for the recovery of caprolactam from polycaprolactam-containing waste material. The present process for depolymerizing multi-component waste material comprising polycaprolactam and non-polycaprolactam components to form caprolactam comprises the step of: in the absence of added catalyst, contacting the multi-component waste material with superheated steam at a temperature of about 250° C. to about 400° C. and at a pressure within the range of about 1 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: 本发明提供了一种从含有聚己内酰胺的废料中回收己内酰胺的有效方法。 用于解聚包含聚己内酰胺和非聚己内酰胺组分以形成己内酰胺的多组分废料的本方法包括以下步骤：在不加入催化剂的情况下，将多组分废料与过热蒸汽在约250℃的温度下接触 约400℃，并且在约1atm至约100atm范围内的压力下，并且基本上小于在其中形成含己内酰胺的蒸汽流的温度下的饱和蒸汽压。

公开(公告)号：US6087494A

公开(公告)日：2000-07-11

申请号：US69204

申请日：1998-04-29

Applicant: Petrus J. H. Thomissen

Inventor： Petrus J. H. Thomissen

IPC: C08F8/50 ,  C07D201/12 ,  C08J11/14 ,  C08J11/16

CPC classification number: C07D201/12

Abstract: Process for the depolymerization of one or more polyamides into its monomeric components in the presence of water by means of at least one alkali metal compound, at least one alkaline-earth metal compound or a combination thereof. The depolymerization takes place at a pressure of between 0.2 and 2.0 MPa, so that high conversions are achieved and the depolymerization reaction proceeds faster, even in the presence of a high content of cyclic oligomers.

Abstract translation: 通过至少一种碱金属化合物，至少一种碱土金属化合物或其组合，在水存在下将一种或多种聚酰胺解聚成其单体成分的方法。 在0.2-2.0MPa的压力下进行解聚，从而即使在高含量的环状低聚物的存在下也能实现高转化率并且解聚反应进行得更快。

公开(公告)号：US5869654A

公开(公告)日：1999-02-09

申请号：US844539

申请日：1997-04-18

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.The formed caprolactam may then be used in the production of engineered resins and fibers.

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。 然后，所形成的己内酰胺可以用于工程化树脂和纤维的生产。

公开(公告)号：US5700358A

公开(公告)日：1997-12-23

申请号：US396623

申请日：1995-03-01

Applicant: Hugo Fuchs ,  Josef Ritz ,  Gerald Neubauer

Inventor： Hugo Fuchs ,  Josef Ritz ,  Gerald Neubauer

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

CPC classification number: C07D201/12 ,  C07D201/16

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US5656757A

公开(公告)日：1997-08-12

申请号：US511334

申请日：1995-08-10

Applicant: Theodore John Jenczewski ,  Lamberto Crescentini ,  Richard Eugene Mayer

Inventor： Theodore John Jenczewski ,  Lamberto Crescentini ,  Richard Eugene Mayer

IPC: C07D201/12

CPC classification number: C07D201/12

Abstract: A process for recovering monomer from multi-component waste material that includes a hydrolyzable polymer, includes contacting the multi-component waste material with water and subjecting the resulting mixture to heat and pressure to form a liquid aqueous portion and a water insoluble portion. The liquid aqueous portion mainly includes depolymerization products of the hydrolyzable polymer, and the water insoluble portion mainly includes components other than the depolymerization products. This mixture is cooled and the liquid aqueous portion and the water insoluble portion are separated. Monomer that formed the hydrolyzable polymer is recovered from the liquid aqueous solution.

Abstract translation: 一种从包含可水解聚合物的多组分废料中回收单体的方法，包括使多组分废料与水接触并对所得混合物进行加热和加压以形成液体水性部分和水不溶性部分。 液体水性部分主要包括可水解聚合物的解聚产物，水不溶性部分主要包括解聚产物以外的成分。 将该混合物冷却，分离液体水性部分和水不溶性部分。 形成可水解聚合物的单体从液体水溶液中回收。

公开(公告)号：US5495014A

公开(公告)日：1996-02-27

申请号：US358412

申请日：1994-12-19

Applicant: Eberhard Fuchs ,  Tom Witzel

Inventor： Eberhard Fuchs ,  Tom Witzel

IPC: C07D201/12

CPC classification number: C07D201/12

Abstract: Caprolactam is prepared by cleaving oligomers or polymers containing essentially the repeating unit --[--N(H)-(CH.sub.2).sub.5 --C(O)--]- in the presence of a catalyst at elevated temperatures by a process in which the cleavage is carried out in the liquid phase in the presence of a heterogeneous catalyst and of an organic solvent.

Abstract translation: 己内酰胺通过在催化剂存在下在升高的温度下裂解基本上含有重复单元 - [ - N（H） - （CH 2）5 -C（O） - ] - 的低聚物或聚合物来制备， 在非均相催化剂和有机溶剂的存在下在液相中进行。

公开(公告)号：US5457197A

公开(公告)日：1995-10-10

申请号：US225273

申请日：1994-04-08

Applicant: Stylianos Sifniades ,  Alan B. Levy

Inventor： Stylianos Sifniades ,  Alan B. Levy

IPC: C07D201/12

CPC classification number: C07D201/12

Abstract: A process for recovering monomer from multi-component waste material that includes a hydrolyzable polymer, the process including contacting the multi-component waste material with water and subjecting the resulting mixture to heat and pressure to form a liquid aqueous portion which mainly includes depolymerization products of the hydrolyzable polymer and a water insoluble portion which mainly includes components other than the depolymerization products; separating the liquid aqueous portion and the water insoluble portion; subjecting the separated aqueous portion to a pressure that is lower than that of step (a) and heat to produce a residue and a distillate which contains monomer; and separating the monomer in the distillate from other components in the distillate. The process is particularly useful for recovering caprolactam from waste materials that include nylon 6.

Abstract translation: 一种从包含可水解聚合物的多组分废料中回收单体的方法，该方法包括使多组分废料与水接触并使所得混合物进行加热和加压以形成液体水性部分，其主要包括： 可水解聚合物和水不溶部分，其主要包括解聚产物以外的成分; 分离液体水性部分和水不溶部分; 将分离的水分部分的压力低于步骤（a）的压力，加热以产生残余物和含有单体的馏出物; 并将馏出物中的单体与馏出物中的其它组分分离。 该方法对于从包括尼龙6的废料回收己内酰胺是特别有用的。

公开(公告)号：US5310905A

公开(公告)日：1994-05-10

申请号：US45780

申请日：1993-04-14

Applicant: Edward F. Moran, Jr.

Inventor： Edward F. Moran, Jr.

IPC: C07C51/347 ,  C07C55/14 ,  C07D201/12

CPC classification number: C07D201/12 ,  C07C51/347 ,  C07C55/14

Abstract: Waste nylon 6 and/or nylon 6,6 are treated with aliphatic monocarboxylic acid to depolymerize the polymer to desirable monomer.

Abstract translation: 将废尼龙6和/或尼龙6,6用脂肪族单羧酸处理以将聚合物解聚为所需的单体。

公开(公告)号：US2840606A

公开(公告)日：1958-06-24

申请号：US50173655

申请日：1955-04-15

Applicant: DU PONT

Inventor： MILLER BRUCE M

IPC: C07C51/06 ,  C07D201/12

CPC classification number: C07D201/12 ,  C07C51/06 ,  C07C55/14