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    DECONTAMINATION OF WET-PROCESSED PHOSPHORIC ACID
    11.
    发明专利
    DECONTAMINATION OF WET-PROCESSED PHOSPHORIC ACID 未知

    公开(公告)号：ZA803999B

    公开(公告)日：1981-07-29

    申请号：ZA803999

    申请日：1980-07-03

    Applicant: HOECHST AG

    Inventor： SCHROEDTER K ,  GRADL R ,  SCHEIBITZ W ,  EHLERS K

    IPC: C01B25/234 ,  C01B25/46 ,  C01B

    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.

    13.
    发明专利
    未知

    公开(公告)号：DK287880A

    公开(公告)日：1981-01-05

    申请号：DK287880

    申请日：1980-07-03

    Applicant: HOECHST AG

    Inventor： GRADL R ,  SCHROEDTER K ,  EHLERS K P ,  SCHEIBITZ W

    IPC: C01B25/234 ,  C01B25/46 ,  C01B

    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.

    15.
    发明专利
    未知

    公开(公告)号：DK314582A

    公开(公告)日：1983-01-16

    申请号：DK314582

    申请日：1982-07-14

    Applicant: HOECHST AG

    Inventor： SCHIMMEL G ,  KRAUSE W ,  GRADL R

    IPC: C02F1/26 ,  C01B25/238 ,  C02F1/62 ,  C22B3/00 ,  C22B3/38 ,  B01D

    Abstract: The disclosure relates to a process for liquid/liquid-extraction of heavy metal ions from acid aqueous solutions with the aid of water-insoluble dithiophosphoric acid diesters as extracting agents. More particularly, use is made of phosphoric acid solutions with a P2O5-content of from 3 to 80 weight %, the solutions being free from emulsion-forming organic contaminants or having previously been freed therefrom in known manner. The resulting aqueous phase is separated from the phase containing the dithiophosphoric acid diester.

    LIQUID-LIQUID EXTRACTION APPARATUS
    16.
    发明专利
    LIQUID-LIQUID EXTRACTION APPARATUS 未知

    公开(公告)号：ZA803998B

    公开(公告)日：1981-07-29

    申请号：ZA803998

    申请日：1980-07-03

    Applicant: HOECHST AG

    Inventor： GRADL R ,  EHLERS K ,  SCHROEDTER K

    IPC: B01D11/04 ,  C01B25/46 ,  C22B3/02 ,  C22B3/26 ,  B01D

    Abstract: The present invention relates to a mixer/settler-type apparatus for continuous liquid-liquid extraction. The apparatus is comprised of a separating vessel with an inclined bottom portion and an agitator-provided mixing vessel. The mixing vessel is tightly mounted to the inclined bottom portion of the separating vessel, the latter being formed with an upper outlet and a lower outlet and having a level indicator LI for determining phase boundary surface area installed therein. The lower outlet is passed through the separating vessel near its lowermost level and the upper outlet is passed therethrough near its upper end. The level indicator LI is connected to a regulator giving adjustment instructions to a structural element permitting the phase boundary surface area to be established in the separating vessel, distinctly above the upper end of the mixing vessel.

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