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    11.
    发明专利
    未知

    公开(公告)号：NO170679C

    公开(公告)日：1992-11-18

    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.

    13.
    发明专利
    未知

    公开(公告)号：FI80251B

    公开(公告)日：1990-01-31

    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 ,  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.

    CONTINUOUS PROCESS FOR COMPLETE REMOVAL OF ORGANIC IMPURITIES FROM WET-PROCESS PHOSPHORIC ACID
    14.
    发明专利
    CONTINUOUS PROCESS FOR COMPLETE REMOVAL OF ORGANIC IMPURITIES FROM WET-PROCESS PHOSPHORIC ACID 未知

    公开(公告)号：ZA891571B

    公开(公告)日：1989-11-29

    申请号：ZA891571

    申请日：1989-03-01

    Applicant: HOECHST AG

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

    IPC: C01B25/234 ,  C01B25/235 ,  C01B25/46 ,  C01B ,  B01J ,  B01D

    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.

    STABILIZED RED PHOSPHORUS, AND PROCESSES FOR THE PREPARATION THEREOF
    18.
    发明专利
    STABILIZED RED PHOSPHORUS, AND PROCESSES FOR THE PREPARATION THEREOF 未知

    公开(公告)号：CA2056022A1

    公开(公告)日：1992-06-15

    申请号：CA2056022

    申请日：1991-11-22

    Applicant: HOECHST AG

    Inventor： STAENDEKE HORST ,  KOLKMANN FRIEDRICH

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

    Abstract: HOE 90/H 035 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 an uncured epoxy resin in a proportion of from 0.2 to less than 5% by weight. 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.

    CONTINUOUS PROCESS FOR COMPLETE REMOVAL OF ORGANIC IMPURITIES FROM, COMPLETE DECOLORIZATION OF PREPURIFIED WET PROCESS PHOSPHORIC ACID
    19.
    发明专利
    CONTINUOUS PROCESS FOR COMPLETE REMOVAL OF ORGANIC IMPURITIES FROM, COMPLETE DECOLORIZATION OF PREPURIFIED WET PROCESS PHOSPHORIC ACID 未知

    公开(公告)号：PH25359A

    公开(公告)日：1991-05-13

    申请号：PH38173

    申请日：1989-02-08

    Applicant: HOECHST AG

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

    IPC: C01B25/234 ,  C01B25/235 ,  C01B25/46

    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 REMOVING METALLIC CONSTITUENTS FROM DUST OBTAINED DURING THE ELECTROTHERMAL PRODUCTION OF YELLOW PHOSPHORUS
    20.
    发明专利
    PROCESS FOR REMOVING METALLIC CONSTITUENTS FROM DUST OBTAINED DURING THE ELECTROTHERMAL PRODUCTION OF YELLOW PHOSPHORUS 未知

    公开(公告)号：CA1282224C

    公开(公告)日：1991-04-02

    申请号：CA549302

    申请日：1987-10-15

    Applicant: HOECHST AG

    Inventor： KOLKMANN FRIEDRICH ,  JODDEN KLAUS

    IPC: C01B25/027 ,  C01B25/04

    Abstract: HOE 86/H 026 PROCESS FOR REMOVING METALLIC CONSTITUENTS FROM DUST OB TAINED DURING THE ELECTROTHERMAL PRODUCTION OF YELLOW PHOSPHORUS Metallic constituents, especially heavy metal constituents are removed from dust electrostatically separated from a gas mixture consisting substantially of carbon monoxide and phosphorus in vapor form obtained during the electrothermal production of yellow phosphorus. To this end, the dust is initially calcined with continuous agitation under oxidizing conditions at temperatures of 300 to 800.degree.C; next, the resulting calcined matter is mixed with carbon and the mixture is treated at temperatures of 950 to 1200.degree.C under reducing conditions with volatilization of the metallic constituents; and the volatilized metallic constituents are ultimately condensed and separated.

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