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    A process for the selective preparation of a 2-hydroxybenzoic acid and a 4-hydroxybenzaldehyde and derivatives thereof.
    71.
    发明专利
    A process for the selective preparation of a 2-hydroxybenzoic acid and a 4-hydroxybenzaldehyde and derivatives thereof. 未知

    公开(公告)号：ZA979177B

    公开(公告)日：1998-05-21

    申请号：ZA979177

    申请日：1997-10-14

    Applicant: RHONE POULENC CHIMIE

    Inventor： DENIS PHILIPPE ,  MALIVERNEY CHRISTIAN ,  METIVIER PASCAL

    IPC: C07B61/00 ,  B01J23/644 ,  C07C45/38 ,  C07C47/565 ,  C07C47/575 ,  C07C47/58 ,  C07C51/255 ,  C07C65/05 ,  C07C

    Abstract: The present invention concerns a process for the preparation of a 2-hydroxybenzoic acid and of a 4-hydroxybenzaldehyde and derivatives thereof from a mixture of two phenolic compounds, one carrying a formyl or hydroxymethyl group in the 2 position, and the other carrying a formyl or hydroxymethyl group in the 4 position. The invention also concerns the preparation of a 4-hydroxybenzaldehyde from said mixture. The invention more particularly concerns the preparation of 3-methoxy-4-hydroxybenzaldehyde and of 3-ethoxy4-hydroxybenzaldehyde, respectively known as "vanillin" and ethylvanillin". The process for the preparation of a 2-hydroxybenzoic acid and a 4-hydroxybenzaldehyde and derivatives thereof is characterised in that the formyl or hydroxymethyl group in the 2 position of compound (A) in a mixture of phenolic compounds, one (A) carrying a formyl or hydroxymethyl group in the 2 position, and the other (B) carrying a formyl or hydroxymethyl group in the 4 position, is selectively oxidised to a carboxy group and optionally a hydroxymethyl group of compound (B) in the 4 position is selectively oxidised to a formyl group, thus producing a mixture of a 2-hydroxybenzoic acid and a 4-hydroxybenzaldehyde.

    77.
    发明专利
    未知

    公开(公告)号：DE69309709D1

    公开(公告)日：1997-05-15

    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.

    78.
    发明专利
    未知

    公开(公告)号：FR2724651B1

    公开(公告)日：1996-12-20

    申请号：FR9411050

    申请日：1994-09-16

    Applicant: RHONE POULENC CHIMIE

    Inventor： METIVIER PASCAL ,  DOS SANTOS EMMANUEL

    IPC: B01J27/13 ,  B01J27/188 ,  B01J27/19 ,  B01J31/04 ,  C07B61/00 ,  C07C51/16 ,  C07C51/27 ,  C07C51/285 ,  C07C53/124 ,  C07C55/00 ,  C07C55/16 ,  C07C55/18 ,  C07C69/24 ,  C07C69/347 ,  C07C69/44 ,  C11C3/00 ,  C07C53/126 ,  C07C51/25

    Abstract: Prepn. of mono- and di-carboxylic acids from unsatd. fatty acids and/or derivs., comprises: (i) oxidising an unsatd. fatty acid, in the form of an acid and/or ester, with hydrogen peroxide in presence of a metal oxide or a carboxylic acid, opt. with a ruthenium catalyst; (ii) reacting the mixt. with nitric acid in presence of a vanadium catalyst, opt. with a co-catalyst; and (iii) recovering the mono- and di-carboxylic acids. The starting material is pref. a fatty acid with at least one double bond, an animal fat or oil, a vegetable oil, an ester of a pptd. fatty acid and is pref. oleic, colza, sunflower and soya oil. The ruthenium catalyst is pref. present in amt. of 1-35 % w.r.t. H2O2. H2O2 may be used with a gp. VIa metal catalyst, esp. a W and/or Mo catalyst in amt. of 1-35 (pref. 3-10) %, w.r.t. H2O2. The vanadium catalyst may be a V halide, a V oxide, a V oxyhalide, a V or vanadyl sulphate, an alkali metal or ammonium vanadate, or V acetylacetonate. The optional V co-catalyst may be based on a Gp. VIIa or VIII metal. A stoichiometric amt. of H2O2 or a 0-50 % excess is used with a carboxylic acid in a hydrogen peroxide : carboxylic acid molar ratio of 10-500 (pref. 10-40) %.

    79.
    发明专利
    未知

    公开(公告)号：FR2724378B1

    公开(公告)日：1996-12-20

    申请号：FR9410781

    申请日：1994-09-09

    Applicant: RHONE POULENC CHIMIE

    Inventor： METIVIER PASCAL ,  BERNARD LAURENT

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

    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.

    80.
    发明专利
    未知

    公开(公告)号：FR2734565A1

    公开(公告)日：1996-11-29

    申请号：FR9506186

    申请日：1995-05-24

    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: The object of the invention is a method for preparing 3-carboxy-4-hydroxybenzaldehydes and derivatives thereof from phenol compounds bearing formyl and/or hydroxymethyl groups in positions 2 and 4. Another object of the invention is the production of 4-hydroxybenzaldehydes from 3-carboxy-4-hydroxybenzaldehydes, and particularly the production of 3-methoxy-4-hydroxybenzaldehyde and 3-ethoxy-4-hydroxybenzaldehyde, known as "vanillin" and "ethyl vanillin" respectively. The method for preparing 3-carboxy-4-hydroxybenzaldehyde is characterised in that the group in position 2 of the phenol compound bearing formyl and/or hydroxymethyl groups in positions 2 and 4 is selectively oxidised to a carboxylic group, and optionally a hydroxymethyl group in position 4 to a formyl group. By thereafter decarboxylating the 3-carboxy-4-hydroxybenzaldehyde, a 4-hydroxybenzaldehyde is obtained.

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