中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

31 records (took 0.021 seconds)

    PROCESS FOR THE PURIFICATION OF WET-PROCESSED PHOSPHORIC ACID
    1.
    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.

    4.
    发明专利
    未知

    公开(公告)号：DK116980A

    公开(公告)日：1980-09-20

    申请号：DK116980

    申请日：1980-03-18

    Applicant: HOECHST AG

    Inventor： MAURER A ,  SCHROEDTER K ,  HEYMER G

    IPC: C01B25/237 ,  B01J23/00 ,  B01J23/54 ,  C01B25/235 ,  C01B

    Abstract: The invention relates to a process for freeing aqueous phosphoric acid solutions from organic contaminants. To this end, the solutions are admixed and reacted with hydrogen peroxide in the presence of a catalyst consisting of a noble metal or metal oxide being inert with respect to phosphoric acid or of a mixture of said noble metal and metal oxide.

    5.
    发明专利
    未知

    公开(公告)号：SE429752B

    公开(公告)日：1983-09-26

    申请号：SE7714259

    申请日：1977-12-15

    Applicant: HOECHST AG

    Inventor： EHLERS K-P ,  SCHEIBITZ W ,  SCHROEDTER K ,  HEYMER G

    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.

    DECONTAMINATION OF WET-PROCESSED PHOSPHORIC ACID
    7.
    发明专利
    DECONTAMINATION OF WET-PROCESSED PHOSPHORIC ACID 未知

    公开(公告)号：PH14335A

    公开(公告)日：1981-05-29

    申请号：PH20552

    申请日：1977-12-14

    Applicant: HOECHST AG

    Inventor： SCHROEDTER K ,  EHLERS K ,  HEYMER G ,  SCHEIBITZ W

    IPC: C01B25/234 ,  C01B25/04 ,  C01B25/18

    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.

    LIQUID-LIQUID EXTRACTION APPARATUS
    10.
    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.

Patent Agency Ranking