公开(公告)号：US3755305A

公开(公告)日：1973-08-28

申请号：US3755305D

申请日：1971-04-15

Applicant: BAYER AG

Inventor： SCHWARZ H ,  IMMEL O

IPC: C07D201/16 ,  C07D41/06

CPC classification number: C07D201/16

Abstract: The invention relates to a process for the purification of Epsilon -caprolactam prepared by catalytic cyclohexanone oxime rearrangement in the gaseous phase which comprises mixing the crude lactam at a temperature above its melting point with at least one branched aliphatic hydrocarbon, the mixing proportions ensuring the formation of a liquid lactam phase in addition to the hydrocarbon phase, separating off the hydrocarbon phase, recrystallising the dissolved lactam from the hydrocarbon phase by cooling, and subjecting the lactam crystals thus obtained to fractional vacuum distillation.

Abstract translation: 本发明涉及在气相中通过催化环己酮肟重排制备的ε-己内酰胺的纯化方法，其包括在高于其熔点的温度下将粗内酰胺与至少一种支链脂族烃混合，确保形成的混合比例 的液相内酰胺相，分离烃相，通过冷却从烃相中重结晶溶解的内酰胺，并将由此获得的内酰胺晶体进行分馏真空蒸馏。

公开(公告)号：US3507856A

公开(公告)日：1970-04-21

申请号：US3507856D

申请日：1967-07-19

Applicant: SNIA VISCOSA

Inventor： SICLARI FRANCESCO ,  MADERNO CESANO ,  MESSINA GIUSEPPE ,  HORAK EDGARDO

IPC: C07D201/16 ,  C07D41/06

CPC classification number: C07D201/16

公开(公告)号：US3290329A

公开(公告)日：1966-12-06

申请号：US41398564

申请日：1964-11-25

Applicant: BASF AG

Inventor： HELMUT DOERFEL

IPC: C07D201/16 ,  C08G69/24

CPC classification number: C08G69/24 ,  C07D201/16

公开(公告)号：US3184476A

公开(公告)日：1965-05-18

申请号：US13640961

申请日：1961-09-05

Applicant: MINNESOTA MINING & MFG

Inventor： WINGFIELD HAROLD T ,  BENJI OIYE

IPC: C07D201/16

CPC classification number: C07D201/16

公开(公告)号：US3127395A

公开(公告)日：1964-03-31

申请号：US3127395D

IPC: C07D201/16

CPC classification number: C07D201/16

公开(公告)号：US3016376A

公开(公告)日：1962-01-09

申请号：US82648559

申请日：1959-07-13

Applicant: SPENCER CHEM CO

Inventor： FRANCIS WILLIAM C

IPC: C07D201/16

CPC classification number: C07D201/16

公开(公告)号：US2960499A

公开(公告)日：1960-11-15

申请号：US76912358

申请日：1958-10-23

Applicant: STAMICARBON

Inventor： BOON JOHANNES W P

IPC: C07D201/00 ,  C07D201/16

CPC classification number: C07D201/16 ,  C07D201/00

公开(公告)号：US20250145567A1

公开(公告)日：2025-05-08

申请号：US18684290

申请日：2022-07-15

Applicant: Nisshinbo Holdings Inc.

Inventor： Gen Masuda

IPC: C07D201/16 ,  C08B16/00

Abstract: A method for recovering a cation component of a neutralized-salt type ionic liquid, characterized by comprising a first step, in which an aqueous solution of the neutralized-salt type ionic liquid is mixed with a water-incompatible organic solvent to prepare a liquid separating into two phases, i.e., an aqueous phase and an organic phase, a second step, in which the liquid separating into two phases is mixed with a water-soluble strong alkali so that the amount of the strong alkali is 20% by mass or larger with respect to the water contained in the aqueous phase, thereby regenerating the cations of the neutralized-salt type ionic liquid present in the aqueous phase, into a neutral substance and moving the neutral substance from the aqueous phase to the organic phase, and a third step, in which the organic phase containing the neutral substance is recovered by a liquid-separating operation.

公开(公告)号：US11208380B2

公开(公告)日：2021-12-28

申请号：US17000116

申请日：2020-08-21

Applicant: AquafilSLO d.o.o.

Inventor： Anacleto Dal Moro ,  Michele Cecchetto ,  Denis Jahic ,  Vid Margon

IPC: B01D3/10 ,  C07D201/16 ,  B01D3/14 ,  B01D11/04 ,  C07D201/06 ,  C07D223/10

Abstract: The present invention relates to a process for purifying caprolactam from solutions of crude caprolactam by a direct treatment with one or more alkaline compounds of polyvalent metals, preferably bivalent and trivalent, without resorting to organic solvent extraction as used in the usual purification process.
A further subject of the present invention is a facility devoid of a unit for organic solvent extraction and designed to carry out the caprolactam purification process described herein.

公开(公告)号：US20210171459A1

公开(公告)日：2021-06-10

申请号：US16932405

申请日：2020-07-17

Applicant: Genomatica, Inc.

Inventor： Rudolf Philippus Maria Guit ,  Thomas Van Der Does ,  Lourina Madeleine Raamsdonk

IPC: C07D201/08 ,  C07D223/10 ,  C07D201/16 ,  C08G69/16

Abstract: The invention relates to a method for preparing caprolactam comprising recovering a mixture containing 6-aminocaproic acid, from a culture medium comprising biomass, and thereafter cyclising the 6-aminocaproic acid in the presence of superheated steam, thereby forming caprolactam, wherein the weight to weight ratio carbohydrate to 6-aminocaproic acid in said mixture is 0.03 or less.