14.
    发明专利
    未知

    公开(公告)号:DK0533132T3

    公开(公告)日:1995-04-18

    申请号:DK92115833

    申请日:1992-09-16

    Applicant: HOECHST AG

    Abstract: A process for the selective oxidation of hydroxymethylpyridine derivatives of the general formula I to pyridinecarboxylic acid derivatives thereof of the formula II on nickelic hydroxide anodes is described.

    15.
    发明专利
    未知

    公开(公告)号:ES2066534T3

    公开(公告)日:1995-03-01

    申请号:ES92115833

    申请日:1992-09-16

    Applicant: HOECHST AG

    Abstract: A process for the selective oxidation of hydroxymethylpyridine derivatives of the general formula I to pyridinecarboxylic acid derivatives thereof of the formula II on nickelic hydroxide anodes is described.

    16.
    发明专利
    未知

    公开(公告)号:AT113582T

    公开(公告)日:1994-11-15

    申请号:AT92115833

    申请日:1992-09-16

    Applicant: HOECHST AG

    Abstract: A process for the selective oxidation of hydroxymethylpyridine derivatives of the general formula I to pyridinecarboxylic acid derivatives thereof of the formula II on nickelic hydroxide anodes is described.

    17.
    发明专利
    未知

    公开(公告)号:DE4217336C2

    公开(公告)日:1994-08-04

    申请号:DE4217336

    申请日:1992-05-26

    Applicant: HOECHST AG

    Abstract: In the prodn. of glyoxylic acid (I) by electrochemical redn. of oxalic acid (II) in aq. soln. in (un)divided cells, (a) the cathode consists of (a-1) carbon or (a-2) at least 50 (wt.)% Cu, Ti, Zr, V, Nb, Ta, Fe, Co, Ni, Sn, Zn, Al and/or Cr; and (b) the aq. electrolyte or catholyte contains metal salt(s) (III) with a H2 over-voltage of at least 0.25 V at a current density (c.d.) of 2500 A/dm2. Pref. suitable cathodes consist of (a-1) graphite, or (a-2) at least 50, pref. at least 80% Fe, Co, Ni, Cr, Cu and/or Ti; an alloy of 2 or more of the cited metals; at least 80, partic. at least 93% alloy of 2 or more of Fe, Co, Ni, Cr, Cu and Ti; 93-96% alloy, 0-20, pref. 4-7% other metal, pref. Mn, Ti and/or Mo, and 0-3, pref. 0-1.2% non-metal, pref. C, Si, P and/or S; stainless steel, esp. stainless Cr-Ni steel. (III) is used in a concn. of (a1) 10 power(-6) to 10, pref. 10 power(-5) to 10 power(-1), esp. 10 power(-4) to 4 x 10 power(-2)% or (a-2) 10 power(-7) to 10, pref. 10 power(-6) to 0.1, esp. 10 power(-5) to 0.04%. (III) pref. is a Cu, Ag, Au, Fe, Hg, Tl, Ti, Zr, V, Ta, Ce, Co, Ni or pref., Pb, Sn, Bi, Zn, Cd or Cr salt or combination of these, esp. a Pb salt. The (II) concn. is between 0.1M and the satn. concn. at the electrolysis temp.. The electrolyte may also contain 10 power(-7) to 10, pref. 10 power(-5) to 10 power(-1)% mineral or organic acid. The cell pref. has a separator, esp. of a cation exchange membrane of polymer with COOH and/or SO3H gps..

    20.
    发明专利
    未知

    公开(公告)号:DE19519008A1

    公开(公告)日:1996-11-28

    申请号:DE19519008

    申请日:1995-05-24

    Applicant: HOECHST AG

    Abstract: Compounds for catalytic oxidation in the liquid phase have the general formula (1): QaMbRucRdXeYfZgOh * H2Oi, in which the symbols Q, M, R, X, Y, a, b, c, d, e, f, g, h and i have the following meanings: Q stands for one or several elements selected in the group Na, K, Rb, Cs, NR R R R , Be, Mg, Ca, Sr, Ba, in which R , R , R and R represent independently from each other hydrogen, a C1-C20 alkyl or C1-C8 cycloalkyl residue, an aryl residue, in particular a methyl, ethyl, propyl or butyl residue; M stands for one or several elements among V, Mo, Wo; R stands for one or several elements selected in the group Sc, Y, La, Ce, Ti, Zr, Nb, Ta, V, Cr, Mn, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu; X stands for one or several elements among F, Cl, Br, J, NO3 , SO4 ; Y stands for one or several elements selected in the group Ga, In, Ge, Sn, S, Se, Te, P, As, Sb, Bi; Z stands for S or Se; a equals 1 to 30; b equals 5 to 50; c equals 0.1 to 10; d equals 0 to 10; e equals 0 to 20; f equals 0 to 10; g equals 0.01 to 10; h equals the number of oxygen atoms required to stochiometrically compensate for oxide formation; i equals 0 to 25.

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