公开(公告)号：US3801566A

公开(公告)日：1974-04-02

申请号：US3801566D

申请日：1971-06-15

Applicant: STAMICARBON

Inventor： ELMENDORP J ,  DE ROOIJ A

IPC: C07D201/16 ,  C07D41/06

CPC classification number: C07D201/16

Abstract: A PROCESS FOR RECOVERING E-CAPROLATAM FRO SOLUTIONS OF E-CAPROLACTAM AND SULPHURIC ACID AND SO3 IS DISCLOSED WHEREIN AMMONIUM DIHYDROGEN PHOSPHATE OR ALKALI METAL DIHYDROGEN PHOSPHATE IS ADDED TO THE LACTAM, SULPHURIC ACID SOLUTION AND THE SOLUTION THEN SUBJECTED TO EXTRACTION BY A SUBSTANTIALLY WATER IMMISCIBLE SOLVENT FOR THE LACTAM WHEREBY THE LACTAM IS EXTRACTED FROM THE SULPHURIC ACID SOLUTION AND THE LACTAM FREE SULPHURIC ACID SOLUTION CAN BE USED TO PROCESS ROCK PHOSPHATE TO GYPSUM AND PHOSPHORIC ACID AND THE PHOSPHORIC ACID BEING CONVERTED TO AMMONIUM OR ALKALI METAL DIHYDROGEN PHOSPHATE TO BE USED IN TREATING FURTHER SOLUTIONS OF LACTAM AND SULPHURIC ACID.

公开(公告)号：US3700669A

公开(公告)日：1972-10-24

申请号：US3700669D

申请日：1968-10-31

Applicant: TORAY INDUSTRIES

Inventor： WAKAMATSU SHIGERU ,  KONDO RYOZO ,  SHINOMIYA MASAYASU

IPC: C07D201/16 ,  C07D41/06

CPC classification number: C07D201/16

Abstract: BY EXTRACTING A LACTAM-CONTAINING REACTION MIXTURE OBTAINED FROM THE BECKMANN REARRANGEMENT REACTION OF A CYCLIC KETOXIME IN THE PRESENCE OF WATER WITH LIQUID SULFUR DIOXIDE, THE LACTAM CAN BE EFFECTIVELY SEPARATED IN THE PURE STATE.

公开(公告)号：US3536700A

公开(公告)日：1970-10-27

申请号：US3536700D

申请日：1967-05-03

Applicant: STAMICARBON

Inventor： PECASSE ALBERTUS H ,  NELEMANS JOHANNES E

IPC: C07D201/16 ,  C07D223/12 ,  C07D41/06

CPC classification number: C07D223/12 ,  C07D201/16

公开(公告)号：US3501275A

公开(公告)日：1970-03-17

申请号：US3501275D

申请日：1968-05-27

Applicant: INVENTA AG

Inventor： SAILER RICHARD ,  PHILIPP HANSWERNER ,  BERTHER CLAU

IPC: B01D9/00 ,  C07C37/74 ,  C07C37/84 ,  C07D201/16 ,  C07B29/00 ,  C07C37/22

CPC classification number: C07D201/16 ,  B01D9/0013 ,  B01D9/004 ,  B01D9/005 ,  C07C37/74 ,  C07C37/84 ,  C07C39/04

公开(公告)号：US3476744A

公开(公告)日：1969-11-04

申请号：US3476744D

申请日：1966-06-07

Applicant: INVENTA AG

Inventor： BERTHER CLAU ,  SAILER RICHARD

IPC: B01D9/00 ,  B01D11/04 ,  C07D201/16 ,  C07D41/00 ,  C07D41/06

CPC classification number: C07D201/16 ,  B01D9/0036 ,  B01D9/0059 ,  B01D11/0488

Abstract: Lactams are purified by forming a melt of crude lactam and adding to it sufficiently finely divided solid crude lactam to make a mixture in which the melt forms 50-90% by weight, maintaining the mixture in an adiabatic state and, after melting equilibrium is reached, separating crystals of purified lactam from the mixture. The process is particularly suitable for the purification of lactams having 7-13 ring members. The crude lactam may be subjected to a preliminary treatment with potassium permanganate prior to purification.

公开(公告)号：US3399119A

公开(公告)日：1968-08-27

申请号：US56369566

申请日：1966-07-08

Applicant: MARATHON OIL CO

Inventor： HALL DAVID W ,  HURLEY JR EDWARD

IPC: C07D201/16

CPC classification number: C07D201/16

公开(公告)号：US3397731A

公开(公告)日：1968-08-20

申请号：US55547066

申请日：1966-06-06

Applicant: MALONEY CRAWFORD TANK

Inventor： GRAVIS CHARLES K ,  WOOD HAROLD S ,  SEIPP GEORGE F

IPC: B01D1/00 ,  B01D1/14 ,  B01D3/34 ,  B01D17/00 ,  B01D17/02 ,  B01D53/14 ,  B01D53/26 ,  B01D53/50 ,  B01D53/52 ,  C01B3/52 ,  C01B17/60 ,  C07C7/11 ,  C07D201/16 ,  C07D207/26 ,  C07D207/267 ,  C10L3/10

CPC classification number: C07D207/267 ,  B01D1/00 ,  B01D1/14 ,  B01D3/346 ,  B01D17/00 ,  B01D17/0205 ,  B01D53/1493 ,  B01D53/263 ,  B01D53/50 ,  B01D53/507 ,  B01D53/526 ,  C01B3/52 ,  C01B17/60 ,  C01B2203/0415 ,  C01B2203/0475 ,  C01B2203/048 ,  C01B2203/0485 ,  C01B2203/0495 ,  C07C7/11 ,  C07D201/16 ,  C10G2300/1025 ,  C10L3/10 ,  C07C9/04

公开(公告)号：US3358018A

公开(公告)日：1967-12-12

申请号：US36127364

申请日：1964-04-20

Applicant: SNIA VISCOSA

Inventor： WERNER MUENCH ,  GIOVANNA IELO

IPC: C07C51/48 ,  C07D201/06 ,  C07D201/16

CPC classification number: C07D201/16 ,  C07C51/48 ,  C07D201/06 ,  C07C63/04 ,  C07C61/08 ,  C07C63/06

公开(公告)号：US3145198A

公开(公告)日：1964-08-18

申请号：US3145198D

CPC classification number: C07D201/16

公开(公告)号：US2969375A

公开(公告)日：1961-01-24

申请号：US2969375D

CPC classification number: C07D201/16