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    21.
    发明专利
    未知

    公开(公告)号：NO308409B1

    公开(公告)日：2000-09-11

    申请号：NO964258

    申请日：1996-10-07

    Applicant: RHONE POULENC CHIMIE

    Inventor： METIVIER PASCAL

    IPC: B01J23/42 ,  B01J23/44 ,  C07B61/00 ,  C07C45/38 ,  C07C45/65 ,  C07C45/67 ,  C07C47/575 ,  C07C47/58 ,  C07C51/255 ,  C07C65/30 ,  C07C201/12 ,  C07C205/61

    Abstract: PCT No. PCT/FR96/00779 Sec. 371 Date Jan. 24, 1997 Sec. 102(e) Date Jan. 24, 1997 PCT Filed May 24, 1996 PCT Pub. No. WO96/37454 PCT Pub. Date Nov. 28, 1996The present invention concerns a process for the preparation of 3-carboxy-4-hydroxybenzaldehydes and derivatives thereof from phenolic compounds carrying formyl and/or hydroxymethyl groups in the 2 and 4 positions. The invention also concerns the preparation of 4-hydroxybenzaldehydes from 3-carboxy-4-hydroxybenzaldehydes. More particularly, the invention concerns the preparation of 3-methoxy-4-hydroxybenzaldehyde and 3-ethoxy-4-hydroxybenzaldehyde, respectively known as "vanillin" and "ethylvanillin". The process for the preparation of 3-carboxy-4-hydroxybenzaldehyde is characterized in that the group in the 2 position in a phenolic compound carrying formyl and/or hydroxymethyl groups in the 2 and 4 positions is selectively oxidized to a carboxy group, and optionally a hydroxymethyl group in the 4 position is selectively oxidized to a formyl group. A successive decarboxylation step for a 3-carboxy-4-hydroxybenzaldehyde produces a 4-hydroxybenzaldehyde.

    23.
    发明专利
    未知

    公开(公告)号：DE69508864T2

    公开(公告)日：1999-11-04

    申请号：DE69508864

    申请日：1995-09-08

    Applicant: RHONE POULENC CHIMIE

    Inventor： METIVIER PASCAL ,  BERNARD LAURENT

    IPC: C06B25/04 ,  C07C201/08 ,  C07C205/24

    Abstract: Prepn. of picric acid comprises nitrating o-nitrophenol and/or p-nitrophenol to dinitrophenols such that the intermediate(s) formed remain soluble in the reaction medium. Nitration is then continued to obtain picric acid which pptes. Either nitric acid or the nitrating mixt. is introduced into the nitrophenol; or the nitrophenol is progressively introduced to the reaction medium comprising nitric acid or the nitrating mixt.; or the nitrophenol and the nitric acid or nitrating mixt. are simultaneously introduced on a first bottoms mixt. comprising water or co-acid. The nitrating mixt. is nitric acid associated with a strong co-acid.

    24.
    发明专利
    未知

    公开(公告)号：BR9606392A

    公开(公告)日：1998-07-14

    申请号：BR9606392

    申请日：1996-05-24

    Applicant: RHONE POULENC CHIMIE

    Inventor： METIVIER PASCAL

    IPC: B01J23/42 ,  B01J23/44 ,  C07B61/00 ,  C07C45/38 ,  C07C45/65 ,  C07C45/67 ,  C07C47/575 ,  C07C47/58 ,  C07C51/255 ,  C07C65/30 ,  C07C201/12 ,  C07C205/61

    Abstract: PCT No. PCT/FR96/00779 Sec. 371 Date Jan. 24, 1997 Sec. 102(e) Date Jan. 24, 1997 PCT Filed May 24, 1996 PCT Pub. No. WO96/37454 PCT Pub. Date Nov. 28, 1996The present invention concerns a process for the preparation of 3-carboxy-4-hydroxybenzaldehydes and derivatives thereof from phenolic compounds carrying formyl and/or hydroxymethyl groups in the 2 and 4 positions. The invention also concerns the preparation of 4-hydroxybenzaldehydes from 3-carboxy-4-hydroxybenzaldehydes. More particularly, the invention concerns the preparation of 3-methoxy-4-hydroxybenzaldehyde and 3-ethoxy-4-hydroxybenzaldehyde, respectively known as "vanillin" and "ethylvanillin". The process for the preparation of 3-carboxy-4-hydroxybenzaldehyde is characterized in that the group in the 2 position in a phenolic compound carrying formyl and/or hydroxymethyl groups in the 2 and 4 positions is selectively oxidized to a carboxy group, and optionally a hydroxymethyl group in the 4 position is selectively oxidized to a formyl group. A successive decarboxylation step for a 3-carboxy-4-hydroxybenzaldehyde produces a 4-hydroxybenzaldehyde.

    26.
    发明专利
    未知

    公开(公告)号：DE69309709T2

    公开(公告)日：1997-10-30

    申请号：DE69309709

    申请日：1993-12-10

    Applicant: RHONE POULENC CHIMIE

    Inventor： DOS SANTOS EMMANUEL ,  METIVIER PASCAL ,  GUBELMANN MICHEL

    IPC: B01J21/06 ,  B01J23/16 ,  B01J23/46 ,  B01J23/70 ,  C07C51/06 ,  C07C55/00 ,  C07C55/10 ,  C07C55/12 ,  C07C55/14

    Abstract: PCT No. PCT/FR93/01232 Sec. 371 Date Jul. 23, 1995 Sec. 102(e) Date Jul. 23, 1995 PCT Filed Dec. 10, 1993 PCT Pub. No. WO94/13616 PCT Pub. Date Jun. 23, 1994Process for the treatment of a material comprising a polymer, especially a polyamide. The process consists in subjecting the polyamide to hydrolysis in the presence of a hydrolyzing nitrous grouping and transforming the hydrolyzed compounds into diacids. The treatment of a polyamide 6.6 results in the recovery of adipic acid and other diacids corresponding to the participating acid monomer and to the transformation of at least one part of the diamine monomer into diacids.

    28.
    发明专利
    未知

    公开(公告)号：AT151404T

    公开(公告)日：1997-04-15

    申请号：AT94902022

    申请日：1993-12-10

    Applicant: RHONE POULENC CHIMIE

    Inventor： DOS SANTOS EMMANUEL ,  METIVIER PASCAL ,  GUBELMANN MICHEL

    IPC: B01J21/06 ,  B01J23/16 ,  B01J23/46 ,  B01J23/70 ,  C07C51/06 ,  C07C55/00 ,  C07C55/10 ,  C07C55/12 ,  C07C55/14

    Abstract: PCT No. PCT/FR93/01232 Sec. 371 Date Jul. 23, 1995 Sec. 102(e) Date Jul. 23, 1995 PCT Filed Dec. 10, 1993 PCT Pub. No. WO94/13616 PCT Pub. Date Jun. 23, 1994Process for the treatment of a material comprising a polymer, especially a polyamide. The process consists in subjecting the polyamide to hydrolysis in the presence of a hydrolyzing nitrous grouping and transforming the hydrolyzed compounds into diacids. The treatment of a polyamide 6.6 results in the recovery of adipic acid and other diacids corresponding to the participating acid monomer and to the transformation of at least one part of the diamine monomer into diacids.

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