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    PROCESS FOR THE PRODUCTION OF CRYSTALLINE SODIUM SILICATES
    1.
    发明专利
    PROCESS FOR THE PRODUCTION OF CRYSTALLINE SODIUM SILICATES 未知

    公开(公告)号：LT3796B

    公开(公告)日：1996-03-25

    申请号：LTIP1447

    申请日：1993-11-05

    Applicant: HOECHST AG

    Inventor： SCHIMMEL GUENTHER ,  KOTZIAN MICHAEL ,  GRADL REINHARD

    IPC: C01B33/32 ,  C01B33/38

    Abstract: In order to prepare crystalline sodium silicates having a layered structure of the formula Na2SixO2x + 1, in which x is between 2 and 3, first sand and sodium carbonate are melted in an SiO2/Na2O molar ratio of 2 to 3.5 at temperatures of 1200 to 1400 DEG C. The sodium silicate pieces formed on cooling of the melt are ground to particle sizes of less than 2 mm before being treated in an elongate reaction zone at temperatures of 600 to 800 DEG C for 10 to 120 minutes with mechanical recirculation. Finally, the material leaving the reaction zone is ground to a particle fineness of less than 1 mm.

    CONTINUOUS PROCESS FOR THE SIMULTANEOUS PREPARATION ACETIC ACID AND ACETIC ANHYDRIDE
    3.
    发明专利
    CONTINUOUS PROCESS FOR THE SIMULTANEOUS PREPARATION ACETIC ACID AND ACETIC ANHYDRIDE 未知

    公开(公告)号：AU8700391A

    公开(公告)日：1992-05-07

    申请号：AU8700391

    申请日：1991-11-01

    Applicant: HOECHST AG

    Inventor： ERPENBACH HEINZ ,  GRADL REINHARD ,  JAGERS ERHARD ,  SEIDEL ANDREAS

    IPC: B01J31/02 ,  B01J31/18 ,  B01J31/30 ,  C07B61/00 ,  C07C51/12 ,  C07C51/56 ,  C07C53/08 ,  C07C53/12

    Abstract: A continuous process for the simultaneous preparation of acetic acid and acetic anhydride from a starting mixture of methanol and methyl acetate and, if appropriate, dimethyl ether, by reaction with carbon monoxide under anhydrous conditions at temperatures from 150 to 250 DEG C and under increased pressure in a reaction zone using a dissolved catalyst system containing a nickel compound, methyl iodide as promoter, at least one co-promoter such as alkali metal iodide, quaternary phosphonium iodide or quaternary ammonium iodide, and a cocatalyst, is characterised in that the cocatalyst used is a rhodium or iridium compound in a molar ratio of nickel : cocatalyst of 1 : (0.005 to 0.1), a nickel concentration of 0.01 to 0.1, preferably 0.015 to 0.06 mol/l is established in the reaction zone, and is carried out under an increased pressure of 30 to 100 bar.

    4.
    发明专利
    未知

    公开(公告)号：DK156951C

    公开(公告)日：1990-03-26

    申请号：DK287880

    申请日：1980-07-03

    Applicant: HOECHST AG

    Inventor： GRADL REINHARD ,  SCHROEDTER KLAUS ,  EHLERS KLAUS-PETER ,  SCHEIBITZ WOLFGANG

    IPC: C01B25/234 ,  C01B25/46

    Abstract: The invention relates to the decontamination of wet-processed phosphoric acid with the use of organic solvents in a plurality of extraction zones, of which each is comprised of a mixing zone and a separating zone, the solvent being immiscible or partially miscible with water. Resulting organic phase and the aqueous phase are contacted countercurrently with respect to one another, the organic solvent phase being dispersed in the aqueous phase. To this end, the invention provides for the aqueous phase to be admitted to the mixing zone at the onset of the extraction, and for organic phase and aqueous phase to be continuously admitted in a volume ratio of at least 2.5:1 to the respective extracting zones in an overall quantity sufficient to provide, in the mixing zones of the extraction zones, a volume ratio of organic phase to aqueous phase of at most 1:1, which is maintained therein.

    PROCESS FOR DEFLUORINATING ALKALI METAL PHOSPHATE SOLUTIONS
    7.
    发明专利
    PROCESS FOR DEFLUORINATING ALKALI METAL PHOSPHATE SOLUTIONS 未知

    公开(公告)号：CA1217025A

    公开(公告)日：1987-01-27

    申请号：CA454809

    申请日：1984-05-22

    Applicant: HOECHST AG

    Inventor： SCHIMMEL GUNTHER ,  RESSEL HERBERT ,  HEYMER GERO ,  GRADL REINHARD

    IPC: C01B25/237 ,  C01B25/30

    Abstract: PROCESS FOR DEFLUORINATING ALKALI METAL PHOSPHATE SOLUTIONS The disclosure relates to a process for defluorinating alkali metal phosphate solutions. To this end, the disclosure provides for an alkali metal phosphate solution neutralized to a pH-value of more than 6 and pre-purified to be stirred at 60 to 120.degree.C into an alkaline earth metal compound. Alkaline earth metal compounds with a solubility in water of less than 5 g/l are used in the form of particles of which more than 50 % have a size of less than 8 .mu.m. After a reaction period of 0.5 to 4 hours, the precipitate obtained is separated from the purified alkali metal phosphate solution.

    8.
    发明专利
    未知

    公开(公告)号：FI862685A

    公开(公告)日：1986-12-27

    申请号：FI862685

    申请日：1986-06-24

    Applicant: HOECHST AG

    Inventor： SCHIMMEL GUENTHER ,  GRADL REINHARD ,  KOLKMANN FRIEDRICH

    IPC: B01D11/04 ,  C01B25/238 ,  C01B25/46 ,  C01G1/02 ,  C22B3/38 ,  C22B7/00 ,  C01B

    Abstract: Residue obtained upon the removal of heavy metal contaminants from crude phosphoric acid by means of a dialkyldithiophosphoric acid ester and adsorbent is worked up into ecologically reliable solid matter and into a heavy metal concentrate. The solid matter and heavy metal concentrate are separated from one another by successive mechanical and chemical treatment. The sequential order of these two operational steps can be inversed.

    9.
    发明专利
    未知

    公开(公告)号：BR8504621A

    公开(公告)日：1986-07-15

    申请号：BR8504621

    申请日：1985-09-20

    Applicant: HOECHST AG

    Inventor： SCHIMMEL GUNTHER ,  GRADL REINHARD

    IPC: C01B25/234 ,  C01B25/237 ,  C01B25/238 ,  C01B25/46 ,  C01G3/00 ,  C01G11/00 ,  C01G13/00 ,  C01G21/00 ,  C01G28/00

    Abstract: Wet process phosphoric acid is freed from heavy metal ions, especially from ions of cadmium, copper, mercury, lead and arsenic and optionally also from organic compounds and sulfuric acid. To this end, the phosphoric acid is contacted with a diorganyldithiophosphoric acid ester and an adsorbent, if desired. Prior to or after said treatment with the ester, the phosphoric acid is admixed with a reductant. The adsorbent, if any is used alone or in combination with an alkaline earth metal compound soluble in phosphoric acid.

    10.
    发明专利
    未知

    公开(公告)号：FI70559B

    公开(公告)日：1986-06-06

    申请号：FI802126

    申请日：1980-07-02

    Applicant: HOECHST AG

    Inventor： GRADL REINHARD ,  SCHROEDTER KLAUS ,  EHLERS KLAUS-PETER ,  SCHEIBITZ WOLFGANG

    IPC: C01B25/234 ,  C01B25/46

    Abstract: The invention relates to the decontamination of wet-processed phosphoric acid with the use of organic solvents in a plurality of extraction zones, of which each is comprised of a mixing zone and a separating zone, the solvent being immiscible or partially miscible with water. Resulting organic phase and the aqueous phase are contacted countercurrently with respect to one another, the organic solvent phase being dispersed in the aqueous phase. To this end, the invention provides for the aqueous phase to be admitted to the mixing zone at the onset of the extraction, and for organic phase and aqueous phase to be continuously admitted in a volume ratio of at least 2.5:1 to the respective extracting zones in an overall quantity sufficient to provide, in the mixing zones of the extraction zones, a volume ratio of organic phase to aqueous phase of at most 1:1, which is maintained therein.

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