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    6.
    发明专利
    未知

    公开(公告)号：BR8002280A

    公开(公告)日：1980-12-02

    申请号：BR8002280

    申请日：1980-04-11

    Applicant: HOECHST AG

    Inventor： SCHULTE W ,  BERGNER D ,  HANNESEN K ,  MULLER W

    IPC: C25B1/34 ,  C25B1/46 ,  C25B15/08

    Abstract: The electrolysis of aqueous alkali metal chloride solutions under pressure has already been carried out. In accordance with the invention there is applied a pressure of at least 8 bars in the anode space for such an electrolysis, as well as a special process for the work-up of the products of the anode space. The mixture of gas and anolyte leaving the anode space is at first mechanically separated, and the anolyte is then depressurized into a stripping column. In the course of this process a dechlorination and cooling of the anolyte are taking place. The anolyte is to enter the pressure release vessel (stripping column) with a temperature being above the boiling point of the anolyte at atmospheric pressure. The reduced pressure is to be between 2 bars and atmospheric pressure. By means of these measures it may be ensured that the anolyte in the stripping column reaches boiling point. Finally the chlorine set free in the pressure release operation is separated from the anolyte.

    7.
    发明专利
    未知

    公开(公告)号：BR7506646A

    公开(公告)日：1976-08-17

    申请号：BR7506646

    申请日：1975-10-10

    Applicant: HOECHST AG

    Inventor： MULLER W ,  HEY H ,  MEIDERT H

    IPC: C07D309/32 ,  B01J21/00 ,  C07B61/00 ,  C07C45/00 ,  C07C45/45 ,  C07C45/60 ,  C07C49/403 ,  C07C49/417 ,  C07C49/443 ,  C07C49/603 ,  C07C49/657 ,  C07C67/00 ,  C07D315/00 ,  C07C49/30

    Abstract: Cyclohexane-1,3-diones of the formula having up to 24 carbon atoms are prepared in admixture with 6-alkyl-3,4-dihydro-2-pyranones of the formula having up to 24 carbon atoms, in which formulae the radicals R and R' may be identical or different and represent each a hydrogen atom, an alkyl, a cycloalkyl or an aryl group each having up to 12 carbon atoms and the two radicals R' together optionally represent a -(CH2)3-group, by passing 4-oxocarboxylic acids of the formula having up to 24 carbon atoms and in which R and R' have the above meaning at a temperature of from 250 DEG to 500 DEG C in the gaseous phase over a dehydration catalyst and the pyranones are converted into cyclohexane-1,3-diones by passing them in the gaseous phase over a dehydration catalyst at a temperature of from 250 DEG to 500 DEG C.

    10.
    发明专利
    未知

    公开(公告)号：BR8002251A

    公开(公告)日：1980-12-02

    申请号：BR8002251

    申请日：1980-04-11

    Applicant: HOECHST AG

    Inventor： MULLER W ,  BERGNER D ,  SCHULTE W ,  HANNESEN K ,  BENDER W

    IPC: C25B1/46 ,  C25B9/19 ,  C25B11/00 ,  C25B9/00

    Abstract: The electrolysis apparatus for the manufacture of chlorine from aqueous alkali metal halide solutions has at least one electrolysis cell the electrodes of which, separated by a separating wall, are arranged in a housing of two hemispherical shells. The housing is furthermore provided with equipment for the feed of the starting materials for electrolysis, and equipment for the discharge of the electrolysis products. The separating wall is clamped by means of sealing elements between the rims of the hemispherical shells and positioned between power transmission elements of non-conductive material. The electrodes are fastened via spacers to the shells and connected mechanically and electrically with the shells via the rims thereof. The hemispherical shells of adjacent cells are positioned flatwise one upon the other, and the end positioned shells of the electrolysis apparatus are supported by pressure compensation elements.

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