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    5.
    发明专利
    未知

    公开(公告)号：DK156951B

    公开(公告)日：1989-10-23

    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.

    6.
    发明专利
    未知

    公开(公告)号：FI70559C

    公开(公告)日：1986-09-24

    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.

    7.
    发明专利
    未知

    公开(公告)号：FI65610C

    公开(公告)日：1984-06-11

    申请号：FI773803

    申请日：1977-12-15

    Applicant: HOECHST AG

    Inventor： EHLERS KLAUS-PETER ,  SCHEIBITZ WOLFGANG ,  SCHROEDTER KLAUS ,  HEYMER GERO

    IPC: C01B25/234 ,  C01B25/46

    Abstract: Wet-processed phosphoric acid is decontaminated. To this end, the phosphoric acid and an organic solvent, which is partially miscible with water and capable of absorbing phosphoric acid, are contacted countercurrently with respect to one another. The resulting organic phosphoric acid solution is separated from contaminants unabsorbed by the solvent, termed primary raffinate, decontaminated phosphoric acid is recovered either in the form of free acid by re-extracting the organic phosphoric acid solution with water, or in the form of an alkali metal phosphate by reacting the organic phosphoric acid solution with an alkali, and the primary raffinate is treated countercurrently with a solvent containing a mineral acid. More specifically, the organic phosphoric acid extract, which orginates from the primary raffinate treatment and contains more than 0 up to at most 10 weight% of water, is mixed with an anhydrous solvent in a ratio by weight necessary to ensure the formation of a mixture containing more than 0 and less than 50% of water than would correspond to the saturation concentration of water in the solvent; and the mixture is contacted countercurrently with the phosphoric acid which is to be decontaminated.

    9.
    发明专利
    未知

    公开(公告)号：MX146677A

    公开(公告)日：1982-07-27

    申请号：MX17173177

    申请日：1977-12-15

    Applicant: HOECHST AG

    Inventor： EHLERS KLAUS PETER ,  SCHEIBITZ WOLFGANG ,  SCHROEDTER KLAUS ,  HEYMER GERO

    IPC: C01B25/234 ,  C01B25/46

    Abstract: Wet-processed phosphoric acid is purified by counter-current extraction with the use of an organic solvent, in which water is partially soluble and which is capable of absorbing phosphoric acid, the organic phosphoric acid extract is separated from residual wet-processed phosphoric acid, unabsorbed by the solvent, and phosphoric acid is recovered from the separated organic phosphoric acid extract. More specifically, the wet-processed phosphoric acid is extracted with the use of a solvent containing more than 0 and less than 50% of water, based on the saturation concentration, and a mineral acid in a quantity corresponding to the quantity, in moles, of cation-bound phosphate in the crude acid.

    10.
    发明专利
    未知

    公开(公告)号：FI802126A

    公开(公告)日：1981-01-05

    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 ,  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.

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