公开(公告)号：US3658905A

公开(公告)日：1972-04-25

申请号：US80673069

申请日：1969-03-12

Applicant: RHONE POULENC SA

Inventor： DAUNIS HENRI ,  GOMINET MARCEL

IPC: H01S3/23 ,  C07C91/44

CPC classification number: C07C213/10 ,  C07C213/02 ,  C07C215/76

Abstract: PARA-AMINOPHENOL, PREPARED BY THE CATALYTIC HYDROGENATION OF NITROBENZENE IN A STRONG ACID MEDIUM, IS PURIFIED BY TREATMENT WITH A LIQUID ALIPHATIC, CYCLOALIPHATIC OR AROMATIC KETONE. THE IMPURE P-AMINOPHENOL MAY BE WASHED WITH AND/OR RECRYSTALLISED FROM KETONES SUCH AS ACETONE, METHYLETHYLKETONE, METHYLISOBUTYLKETONE, CYCLOHEXANONE OR ACETOPHENONE AND THE PURIFIED P-AMINOPHENOL IS FOUND TO REMAIN COLOURLESS OVER SEVERAL MONTHS WHEN STORED WITH STABILISING AGENTS. FURTHER PURIFICATION IS ACHIEVED BY DISSOLVING THE PURIFIED CRYSTALS IN BOILING WATER AND RECRYSTALLISING THE P-AMINOPHENOL FROM THE AQUEOUS PHASE.

公开(公告)号：US3654365A

公开(公告)日：1972-04-04

申请号：US3654365D

申请日：1969-01-29

Applicant: RHONE POULENC SA

Inventor： DAUNIS HENRI ,  PERRAS PHILIPPE

IPC: B01J23/00 ,  C07C67/00 ,  C07C213/00 ,  C07C213/02 ,  C07C215/76 ,  C07C91/44

CPC classification number: C07C213/02

Abstract: PARA-AMINOPHENOL IS MADE IN GOOD YIELD BY HYDROGENATION OF NITROLBENZENE IN THE PRESENCE OF A STRONG ACID AND A PLATINUM CATALYST AT A HYDROGEN PRESSURE ABOVE ONE ATMOSPHERE.