公开(公告)号：US3767647A

公开(公告)日：1973-10-23

申请号：US3767647D

申请日：1971-01-11

Applicant: TOA GOSEI CHEM IND

Inventor： HIROSE T ,  MATSUBARA T

IPC: C07D201/04 ,  C07D41/00

CPC classification number: C07D201/04

Abstract: A HIGH PURITY W-LAUROLACTAM IS PREPARED FROM A CRUDE CYCLODODECANONE OXIME CONTAINING 5% BY WEIGHT OR LESS OF CYCLODODECANONE BY SUBJECTING THE OXIME TO THE BECKMANN REARRANGEMENT REACTION IN THE PRESENCE OF SULFURIC ACID HAVING A CONCENTRATION OF 98% BY WEIGHT OR MORE OR FUMING SULFURIC ACID CONTAINING 20% BY WEIGHT OR LESS OF SULFURIC-ANHYDRIDE, SEPARATING THE THUS FORMED W-LAUROLACTAM FROM THE REACTION MIXTURE, DISSOLVING THE RESULTING W-LAUROLACTAM N A LIQUID AROMATIC HYDROCARBON, WASHING THE SOLUTION WITH AN ALKALI SOLUTION AT A TEMPERATURE OF 60* TO 120* C., AND RECOVERING W-LAUROLACTAM.

公开(公告)号：US3808275A

公开(公告)日：1974-04-30

申请号：US12735071

申请日：1971-03-23

Applicant: TOA GOSEI CHEM IND

Inventor： HIROSE T ,  MATSUBARA T

IPC: C07C131/00

Abstract: A HIGH-PURITY KETOXIME CAN BE OBTAINED IN A HIGH YIELD (HIGH CONVERSION AND HIGH SELECTIVITY) BY REACTING AT LEAST ONE KETONE WITH HYDROXYLAMINE OR A SALT THEREOF IN THE PRESENCE OF A TIN-CONTAINING COMPOUND, EVEN WHEN THE PH OF THE REACTION SYSTEM IS 6 OR HIGHER.