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    5.
    发明专利
    未知

    公开(公告)号：DE59101013D1

    公开(公告)日：1994-03-24

    申请号：DE59101013

    申请日：1991-04-05

    Applicant: HOECHST AG

    Inventor： RITTNER SIEGBERT DR ,  SCHMIDT ADOLF DR ,  STEINER RUDOLF PROF DR ,  UNVERDORBEN LEONHARD

    IPC: C07C17/38 ,  C07C17/386 ,  C07C25/08

    Abstract: The invention relates to a process for the separation of m- and p-dichlorobenzene by extractive rectification using an extractant and removal of this extractant, in which the extractants used are alkylene carbonates of the general formula … … in which R , R , R and R are identical to or different from one another and represent hydrogen, a methyl or an ethyl radical, with the proviso that the radicals R to R together do not contain more than 6 C atoms. … The process according to the invention makes it possible to separate off the m isomer in high purity.

    7.
    发明专利
    未知

    公开(公告)号：DE3671461D1

    公开(公告)日：1990-06-28

    申请号：DE3671461

    申请日：1986-11-28

    Applicant: HOECHST AG

    Inventor： STUEVEN UWE ,  SCHMIDT ADOLF DR

    IPC: C09K5/04

    Abstract: The pair of substances for absorption heat transformers consists of methanol and tetraethylene glycol dimethyl ether.

    8.
    发明专利
    未知

    公开(公告)号：DE59408039D1

    公开(公告)日：1999-05-06

    申请号：DE59408039

    申请日：1994-11-23

    Applicant: HOECHST AG

    Inventor： MILLAUER HANS DR ,  SCHMIDT ADOLF DR

    IPC: C07C2/80 ,  B01J19/00 ,  C07C2/82 ,  C07C15/24 ,  C25B3/13 ,  C25B3/29

    Abstract: The prodn. of 2,2'-dimethyl-1,1'-binaphthyl (I) and 2,7'-dimethyl-1,1'-binaphthyl (II) comprises the electrochemical oxidative dimerisation of 2-methylnaphthalene (III) in acetonitrile/water/conductive salt mixts. contg. other component(s) (IV) which is/are immiscible or only partly miscible with water, followed by fractionation under vacuum. Also claimed is 2,7'-dimethyl-1,1'-binaphthyl (II). Water-immiscible component (IV) comprises (cyclo)aliphatic, aromatic or halogenated hydrocarbon, ketone or a mixt. thereof, esp. e.g., pentane, hexane, cyclohexane, methylcyclohexane, heptane, octane, iso-octane, decane, dodecane or decalin, pref. 6-10C (cyclo)aliphatic hydrocarbon, esp. pref. heptane or octane, or benzene, toluene, xylene(s), mesitylene, naphthalene or tetralin, pref. 6-10C aromatic hydrocarbon, esp. pref. toluene or xylene, or CH2Cl2 or chlorobenzene, or a 5-10C ketone, pref. Et-CO-Et-, Me-CO-tert.-Bu or acetophenone. Or (III) itself may be used as component (IV), in amts. such that the electrolyte always contains 10-50 (pref. 15-40) wt.% (III). Suitable conductive salts are alkali, alkaline earth, ammonium or mono-, di-, tri- or tetra-alkylammonium salts of acids with anions derived from S(IV), P(V) or B(III), pref., e.g., hydrogen sulphate, methylsulphate, octanesulphonate, toluenesulphonate, methanephosphonate, hexafluorophosphate or tetrafluoro-borate (21 anions listed). Pref., salts are salts of opt. poly- or per-fluorinated alkane-sulphonic or -phosphonic acids, e.g., trifluoromethanesulphonate, nonafluoro-butanesulphonate or phosphonate, etc. (7 anions listed), or Na or tetra-(1-4C alkyl)-ammonium salts of 1-8C alkane-sulphonic acids, 1-4C poly- or per-fluoroalkane-sulphonic acids, arylsulphonic acids (with aryl = Ph, naphthyl, or alkyl- or Cl-substd. Ph), tetrafluoroboric acid or hexafluoro-phosphoric acid. Wt. ratio acetonitrile:water = (100:1)-(1:1), pref. (20:1)-(2:1); the electrolyte contains 10-90 (pref. 20-80) wt.% (IV) and 0.5-15 (pref. 1-7) wt.% conductive salt. Electrolysis is carried out at 0-80 (pref. 20-50) degrees C, with a current density of 10-250 (pref. 25-150, esp. pref. 40-100) mA/cm , using an anode of graphite, vitreous carbon, Pt or stainless steel, pref. graphite, and a cathode of graphite, vitreous carbon or metal, pref. graphite or vitreous carbon. Rectification is carried out at up to 400 (pref. up to 350) degrees C and 5-100 (pref. 10-80, esp. pref. 10-60) hPa (column head pressure), with 30-90 (pref. 40-80, esp. pref. 50-70) sepn. stages and a reflux ratio of 3-60.

    9.
    发明专利
    未知

    公开(公告)号：ES2051042T3

    公开(公告)日：1994-06-01

    申请号：ES91105399

    申请日：1991-04-05

    Applicant: HOECHST AG

    Inventor： RITTNER SIEGBERT DR ,  SCHMIDT ADOLF DR ,  STEINER RUDOLF PROF DR ,  UNVERDORBEN LEONHARD

    IPC: C07C17/38 ,  C07C17/386 ,  C07C25/08

    Abstract: The invention relates to a process for the separation of m- and p-dichlorobenzene by extractive rectification using an extractant and removal of this extractant, in which the extractants used are alkylene carbonates of the general formula … … in which R , R , R and R are identical to or different from one another and represent hydrogen, a methyl or an ethyl radical, with the proviso that the radicals R to R together do not contain more than 6 C atoms. … The process according to the invention makes it possible to separate off the m isomer in high purity.

    10.
    发明专利
    未知

    公开(公告)号：DE4011501A1

    公开(公告)日：1991-10-17

    申请号：DE4011501

    申请日：1990-04-10

    Applicant: HOECHST AG

    Inventor： RITTNER SIEGBERT DR ,  SCHMIDT ADOLF DR ,  STEINER RUDOLF PROF DR ,  UNVERDORBEN LEONHARD DIPL ING

    IPC: C07C17/38 ,  C07C17/386 ,  C07C25/08

    Abstract: The invention relates to a process for the separation of m- and p-dichlorobenzene by extractive rectification using an extractant and removal of this extractant, in which the extractants used are alkylene carbonates of the general formula … … in which R , R , R and R are identical to or different from one another and represent hydrogen, a methyl or an ethyl radical, with the proviso that the radicals R to R together do not contain more than 6 C atoms. … The process according to the invention makes it possible to separate off the m isomer in high purity.

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