公开(公告)号：US3937789A

公开(公告)日：1976-02-10

申请号：US425171

申请日：1973-12-14

Applicant: Ivo Donati ,  Werner Muench ,  Mario Fidecicchi

Inventor： Ivo Donati ,  Werner Muench ,  Mario Fidecicchi

IPC: C01C1/242 ,  C07D201/16

CPC classification number: C07D201/16 ,  C01C1/242

Abstract: A process is disclosed in which the heat generated, during neutralization,y ammonium sulfate of a solution of .xi.-caprolactam in sulfuric acid, is used to effect evaporation of water present, and the temperature is kept at about 40.degree.C to 50.degree.C, under subatmospheric pressure, so that substantial hydrolysis of the caprolactam is avoided while a substantial portion of the water present in the neutralization mixture is evaporated at the subatmospheric pressure, and the ammonium sulfate is crystallized substantially free from entrained caprolactam. The caprolactam is then separated from the aqueous phase.

公开(公告)号：US3850910A

公开(公告)日：1974-11-26

申请号：US30172672

申请日：1972-10-30

Applicant: STAMICARBON

Inventor： GOETTSCH R ,  VOS H

IPC: C07D201/04 ,  C07D201/16 ,  C07D41/06

CPC classification number: C07D201/04 ,  C07D201/16

Abstract: 1. IN A PROCESS FOR THE RECOVERY PURE E-CAPROLACTAM CONTAINING LESS THAN 5 MEQ. OF IONOGENIC SUBSTANCES PER KG. OF LACTAM, OBTAINED BY INTRAMOLECULAR CONVERSION OF CYCLOHEXANONE OXIME WITH THE AID OF AN ACID CATALYST FROM THE GROUP CONSISTING OF SULFURIC ACID, OLEUM AND SULPHUR TRIOXIDE, AND EXTRACTION OF THE REACTION MIXTURE AFTER DILUTION WITH WATER AND, OPTIONALLY AFTER PARTIAL NEUTRALIZATION OF THE SULPHURIC ACID, WITH A WATER-IMMISCIBLE ORGANIC SOLVENT FOR THE LACTAM, THE IMPROVEMENT COMPRISING NEUTRALIZING THE RESULTING SOLVENT OF LACTAM IN THE ORGANIC SOLVENT WITH AQUEOUS AMMONIA TO A PH OF AT LEAST 4.5 (MEASURED AT 20* C.), THEREBY FORMING AN EMULSION OF AN AQUEOUS 15-40% WT. AMMONIUM SULPHATE SOLUTION EMULSIFIED IN THE ORGANIC SOLVENT, WASHING THE EMULSION WITH A COUNTERFLOW OF DEMINERALIZED WATER IN A WEIGHT RATIO OF 4-20 PARTS THEREBY REESTRACTING THE LACTAM FROM THE ORGANIC SOLVENT TO PRODUCE AN ECAPROLACTAM SOLUTION WITH LESS THAN 5 MEQ. OF IONOGENIC SUBSTANCES PER KG. OF LACTAM, WHILE THE RESULTING AQUEOUS LACTAM SOLUTION IS EVAPORATED, OPTIONALLY AFTER HAVING BEEN FREED OF ORGANIC IONGENIC COMPOUNDS ON CATION AND ANION EXCHANGERS.

公开(公告)号：US3806427A

公开(公告)日：1974-04-23

申请号：US26332072

申请日：1972-06-15

Applicant: ALRAC CORP

Inventor： GERVASI J ,  UPADHYAYA J

IPC: C07D201/16 ,  B01D3/10

CPC classification number: C07D201/16

Abstract: 2-PYRROLIDONE CAN BE PURIFIED THROUGH DISTILLATION FROM A MIXTURE OF IMPURE 2-PYRROLIDONE AND A BORON OXIDE DERIVATIVE.

公开(公告)号：US3745746A

公开(公告)日：1973-07-17

申请号：US3745746D

申请日：1971-03-25

Applicant: GAF CORP

Inventor： PSYRAS H ,  BELLISIO A

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

Abstract: A method of dehydrating gases using N-alkyllactams is described. Included are steps for the recovery of any entrained vapors of the N-alkyllactams from the dehydrated gas streams and the recirculation of the recovered lactams thus reducing the operating cost of such process.

公开(公告)号：US3179657A

公开(公告)日：1965-04-20

申请号：US3179657D

CPC classification number: C07D201/16

公开(公告)号：US3140294A

公开(公告)日：1964-07-07

申请号：US18143962

申请日：1962-03-21

Applicant: FMC CORP

Inventor： KOLYER JOHN M

IPC: C07D201/16

CPC classification number: C07D201/16

公开(公告)号：US3016287A

公开(公告)日：1962-01-09

申请号：US76270258

申请日：1958-09-23

Applicant: SPENCER CHEM CO

Inventor： HOPKINS THOMAS R ,  FRANCIS WILLIAM C

IPC: C07D201/16

CPC classification number: C07D201/16

公开(公告)号：US2973355A

公开(公告)日：1961-02-28

申请号：US2973355D

CPC classification number: C07D201/16

公开(公告)号：US2752336A

公开(公告)日：1956-06-26

申请号：US2752336D

CPC classification number: C07D201/16

公开(公告)号：US2405969A

公开(公告)日：1946-08-20

申请号：US45845542

申请日：1942-09-15

Applicant: DU PONT

Inventor： MARTIN ELMORE L

IPC: C07D201/16

CPC classification number: C07D201/16