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    1.
    发明专利
    未知

    公开(公告)号：MX169786B

    公开(公告)日：1993-07-26

    申请号：MX1512789

    申请日：1989-03-02

    Applicant: HOECHST AG

    Inventor： KOLKMANN FRIEDRICH ,  SCHIMMEL GUNTHER ,  BETTERMANN GERHARD ,  HEYMER GERO

    IPC: C01B25/234 ,  C01B25/235 ,  C01B25/46 ,  C01B25/222 ,  B01J20/20

    Abstract: A continuous process is indicated for complete removal of organic impurities from and complete decolorization of pre-purified wet-process phosphoric acid which has been purified by an extractive method using an organic solvent, freed from residual hydrofluoric acid by steam stripping and treated with hydrogen peroxide at elevated temperature, which comprises mixing the pre-purified wet-process phosphoric acid and the hydrogen peroxide in a mixing zone at a temperature of from 100 DEG to 200 DEG C., preferably 140 DEG to 160 DEG C., and allowing them to react at this temperature for a further 1 to 4 hours, cooling to from 85 DEG to 90 DEG C. the pre-purified wet-process phosphoric acid treated in this way and pumping it at this temperature with exclusion of air firstly through an activated charcoal bed which has been prepared on the basis of peat and has been steam-activated and has a BET surface area of from 800 to 1000 m2/g, and subsequently through a silicon carbide and/or graphite bed while maintaining a pumping rate of less than 0.5 m3/h of wet-process phosphoric acid per m3 of activated charcoal bed.

    PROCESS FOR WORKING UP DUSTS WHICH ARE PRODUCED IN THE ELECTROTHERMAL PRODUCTION OF PHOSPHORUS
    2.
    发明专利
    PROCESS FOR WORKING UP DUSTS WHICH ARE PRODUCED IN THE ELECTROTHERMAL PRODUCTION OF PHOSPHORUS 未知

    公开(公告)号：CA1303326C

    公开(公告)日：1992-06-16

    申请号：CA605281

    申请日：1989-07-11

    Applicant: HOECHST AG

    Inventor： KOLKMANN FRIEDRICH ,  SCHIMMEL GUENTHER ,  SCHEFFER JOHANNES

    IPC: C01B25/027 ,  C01B25/30 ,  C01B25/41

    Abstract: HOE 88/H 025 Process for working up dusts which are produced in the electrothermal production of phosphorus of the disclosure A process is provided for working up dusts which have been precipitated electrostatically from the gas mixture composed essentially of carbon monoxide and phosphorus vapor produced in the electrothermal production of yellow phosphorus, which process comprises converting the dusts into a calcinate at 300 to 800.degree.C under oxidizing conditions in a first step, leaching the calcinate with phosphoric acid in a second step, adjusting the pH of the solution in phosphoric acid to 0 to 1.5 with sodium hydroxide solution in a third step, precipitating the sulfides of lead, copper and cadmium from the partially neutralized solution in phosphoric acid by adding sulfide and filtering them off in a fourth step, adjusting the pH of the filtered, partially neutralized solution in phosphoric acid to about 1.5 to 5.0 with sodium hydroxide solution and precipitating zinc sulfide, if necessary by adding further quantities of sulfide, and filtering it off in a fifth step, further neutralizing the sodium phosphate solution, if necessary after expelling excess sulfide, with sodium hydroxide solution and separating it from precipitated calcium compounds in a sixth step, and using the resultant sodium phosphate solution in this form in a known manner to produce sodium phosphate salts.

    STABILIZED RED PHOSPHORUS, AND PROCESSES FOR THE PREPARATION THEREOF
    3.
    发明专利
    STABILIZED RED PHOSPHORUS, AND PROCESSES FOR THE PREPARATION THEREOF 未知

    公开(公告)号：CA2056002A1

    公开(公告)日：1992-06-15

    申请号：CA2056002

    申请日：1991-11-22

    Applicant: HOECHST AG

    Inventor： STAENDEKE HORST ,  KOLKMANN FRIEDRICH

    IPC: B01J2/00 ,  C01B25/00 ,  C01B25/023

    Abstract: Stabilized red phosphorus, and processes for the preparation thereof of the disclosure: In a stabilized, pulverulent red phosphorus comprising phosphorus particles having a maximum particle size of 2 mm whose surface is covered with a thin coating of an oxidation stabilizer, the oxidation stabilizer comprises tin oxide hydrate and an uncured epoxy resin. The red phosphorus stabilized in this way may additionally be covered by a thin coating of di-2-ethylhexyl phthalate as phlegmatizing agent. In addition, processes for the preparation of the stabilized and possibly additionally phlegmatized red phosphorus are described.

    6.
    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.

    8.
    发明专利
    未知

    公开(公告)号：NO170679B

    公开(公告)日：1992-08-10

    申请号：NO862574

    申请日：1986-06-25

    Applicant: HOECHST AG

    Inventor： SCHIMMEL GUENTHER ,  GRADL REINHARD ,  KOLKMANN FRIEDRICH

    IPC: B01D11/04 ,  C01B25/238 ,  C01B25/46 ,  C01G1/02 ,  C22B3/38 ,  C22B7/00 ,  C01B25/234

    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.

    10.
    发明专利
    未知

    公开(公告)号：FI862685A0

    公开(公告)日：1986-06-24

    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.

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