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.

公开(公告)号：FR1564882A

公开(公告)日：1969-04-25

申请号：FR143564

申请日：1968-03-13

Applicant: RHONE POULENC SA

Inventor： DAUNIS HENRI ,  GOMINET MARCEL

IPC: H01S3/23

Abstract: The phenol, made by hydrogenating nitrobenzene in strong acid, is purified in a first step by contacting the hydrogenation broth (I) contg. p-aminophenol (II) in suspension with a ketone immiscible in water and in a second step comprising removing catalyst, neutralising I and again contacting with ketone while operating in homogeneous or heterogeneous phase. The ketone layer e.g. methylisobutylketone affords crystals of II.

公开(公告)号：GB1228568A

公开(公告)日：1971-04-15

申请号：GB1313169

申请日：1969-03-12

Applicant: RHONE POULENC SA

Inventor： DAUNIS HENRI ,  GOMINET MARCEL

IPC: H01S3/23

Abstract: 1,228,568. p-Aminophenol. RHONE-POULENC S.A. 12 March, 1969 [14 Jan., 1969], No. 13131/69. Heading C2C. A process for the purification of p-aminophenol prepared by the catalytic hydrogenation of nitrobenzene in a strong acid medium comprises contacting the impure p-aminophenol with a liquid aliphatic, cycloaliphatic or aromatic ketone. Examples are furnished.

公开(公告)号：DE1912827A1

公开(公告)日：1969-10-09

申请号：DE1912827

申请日：1969-03-13

Applicant: RHONE POULENC SA

Inventor： DAUNIS HENRI ,  GOMINET MARCEL

IPC: H01S3/23 ,  C07C91/44

Abstract: The phenol, made by hydrogenating nitrobenzene in strong acid, is purified in a first step by contacting the hydrogenation broth (I) contg. p-aminophenol (II) in suspension with a ketone immiscible in water and in a second step comprising removing catalyst, neutralising I and again contacting with ketone while operating in homogeneous or heterogeneous phase. The ketone layer e.g. methylisobutylketone affords crystals of II.

公开(公告)号：NL136592C

公开(公告)日：1973-01-16

申请号：NL6903403

申请日：1969-03-05

Applicant: RHONE POULENC SA

Inventor： DAUNIS HENRI ,  GOMINET MARCEL

IPC: H01S3/23

Abstract: The phenol, made by hydrogenating nitrobenzene in strong acid, is purified in a first step by contacting the hydrogenation broth (I) contg. p-aminophenol (II) in suspension with a ketone immiscible in water and in a second step comprising removing catalyst, neutralising I and again contacting with ketone while operating in homogeneous or heterogeneous phase. The ketone layer e.g. methylisobutylketone affords crystals of II.

公开(公告)号：DE1904574A1

公开(公告)日：1969-08-28

申请号：DE1904574

申请日：1969-01-30

Applicant: RHONE POULENC SA

Inventor： DAUNIS HENRI ,  PERRAS PHILIPPE

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

Abstract: 1,229,707. p - Aminophenol. RHONEPOULENC S.A. 29 Jan., 1969 [30 Jan., 1968], No.5019/69. Heading C2C. In a process for the preparation of paraaminophenol which comprises hydrogenating nitrobenzene in the presence of a catalyst based on platinum in an aqueous solution of sulphuric or phosphoric acid, under a partial pressure of hydrogen exceeding 1 atmosphere, the nitrobenzene is injected continuously into the reaction medium.