中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

19 records (took 0.018 seconds)

    1.
    发明专利
    未知

    公开(公告)号：BR8004137A

    公开(公告)日：1981-03-24

    申请号：BR8004137

    申请日：1980-07-03

    Applicant: HOECHST AG

    Inventor： SCHRODTER K ,  GRADL R ,  EHLERS K

    IPC: B01D11/04 ,  C01B25/46 ,  C22B3/02 ,  C22B3/26 ,  B01F13/00

    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.

    RECOVERY OF URANIUM FROM WET-PROCESSED PHOSPHORIC ACID
    2.
    发明专利
    RECOVERY OF URANIUM FROM WET-PROCESSED PHOSPHORIC ACID 未知

    公开(公告)号：ZA81793B

    公开(公告)日：1982-03-31

    申请号：ZA81793

    申请日：1981-02-06

    Applicant: HOECHST AG

    Inventor： HEYMER G ,  SCHIMMEL G ,  GRADL R

    IPC: B01D11/04 ,  C01G43/00 ,  C22B60/02 ,  C01G

    Abstract: The present invention relates to a process for recovering uranium from raffinate which is obtained by extracting phosphoric acid from a uranium-containing wet-process phosphoric acid with the aid of organic extractants and separating the resulting organic phosphoric acid extract from residue not taken up by the extract. To this end, the raffinate residue is subjected to thermal treatment and thereby freed from dissolved or emulsified residual extractant. Next, the raffinate is treated with a water-immiscible solvent to extract the uranium, and the extracted uranium is separated from the undissolved raffinate portion.

    LIQUID-LIQUID EXTRACTION APPARATUS
    3.
    发明专利
    LIQUID-LIQUID EXTRACTION APPARATUS 未知

    公开(公告)号：ZA8003998B

    公开(公告)日：1981-07-29

    申请号：ZA8003998

    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

    CPC classification number: C22B3/02 ,  B01D11/0457 ,  B01D11/0484 ,  C01B25/462 ,  C22B3/0005 ,  Y02P10/234

    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.

    4.
    发明专利
    未知

    公开(公告)号：BR8007397A

    公开(公告)日：1981-05-26

    申请号：BR8007397

    申请日：1980-11-13

    Applicant: HOECHST AG

    Inventor： EHLERS K ,  GRADL R ,  SCHRODTER K

    IPC: C01B25/234 ,  C01B25/237 ,  C01B25/46

    Abstract: The invention relates to a process for the purification of wet-processed phosphoric acid with the aid of organic solvents which are immiscible or only partially miscible with water, the sulfate ions being removed by addition of barium compounds. The purification is carried out in an n-stage extraction installation, where n is equal to or greater than 5. The barium compound is added to the phosphoric acid to be purified, and the resulting mixture is fed to the top of the extraction installation, in which the organic solvent phase is dispersed in the aqueous phase. The sulfuric acid is led in counter-current fashion to the phosphoric acid by adding it to one of the stages n=4 to at most n-1.

    5.
    发明专利
    未知

    公开(公告)号：BR8004138A

    公开(公告)日：1981-01-21

    申请号：BR8004138

    申请日：1980-07-03

    Applicant: HOECHST AG

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

    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 THE PURIFICATION OF WET-PROCESSED PHOSPHORIC ACID
    7.
    发明专利
    PROCESS FOR THE PURIFICATION OF WET-PROCESSED PHOSPHORIC ACID 未知

    公开(公告)号：ZA807016B

    公开(公告)日：1981-11-25

    申请号：ZA807016

    申请日：1980-11-13

    Applicant: HOECHST AG

    Inventor： SCHROEDTER K ,  EHLERS K ,  GRADL R

    IPC: C01B25/237 ,  C01B25/46 ,  C01B25/234 ,  C01B

    Abstract: The invention relates to a process for the purification of wet-processed phosphoric acid with the aid of organic solvents which are immiscible or only partially miscible with water, the sulfate ions being removed by addition of barium compounds. The purification is carried out in an n-stage extraction installation, where n is equal to or greater than 5. The barium compound is added to the phosphoric acid to be purified, and the resulting mixture is fed to the top of the extraction installation, in which the organic solvent phase is dispersed in the aqueous phase. The sulfuric acid is led in counter-current fashion to the phosphoric acid by adding it to one of the stages n=4 to at most n-1.

Patent Agency Ranking