公开(公告)号：NO910136L

公开(公告)日：1991-07-15

申请号：NO910136

申请日：1991-01-11

Applicant: HOECHST AG

Inventor： SCHIMMEL GUENTER ,  KOTZIAN MICHAEL ,  GRADL REINHARD

IPC: C01B33/32 ,  C01B33/38

Abstract: In order to prepare crystalline sodium silicates having a layered structure of the formula Na2SixO2x + 1, in which x is between 2 and 3, first sand and sodium carbonate are melted in an SiO2/Na2O molar ratio of 2 to 3.5 at temperatures of 1200 to 1400 DEG C. The sodium silicate pieces formed on cooling of the melt are ground to particle sizes of less than 2 mm before being treated in an elongate reaction zone at temperatures of 600 to 800 DEG C for 10 to 120 minutes with mechanical recirculation. Finally, the material leaving the reaction zone is ground to a particle fineness of less than 1 mm.

公开(公告)号：NO910136D0

公开(公告)日：1991-01-11

申请号：NO910136

申请日：1991-01-11

Applicant: HOECHST AG

Inventor： SCHIMMEL GUENTER ,  KOTZIAN MICHAEL ,  GRADL REINHARD

IPC: C01B33/32 ,  C01B33/38 ,  C01B

Abstract: In order to prepare crystalline sodium silicates having a layered structure of the formula Na2SixO2x + 1, in which x is between 2 and 3, first sand and sodium carbonate are melted in an SiO2/Na2O molar ratio of 2 to 3.5 at temperatures of 1200 to 1400 DEG C. The sodium silicate pieces formed on cooling of the melt are ground to particle sizes of less than 2 mm before being treated in an elongate reaction zone at temperatures of 600 to 800 DEG C for 10 to 120 minutes with mechanical recirculation. Finally, the material leaving the reaction zone is ground to a particle fineness of less than 1 mm.

公开(公告)号：BR8403902A

公开(公告)日：1985-07-09

申请号：BR8403902

申请日：1984-08-03

Applicant: HOECHST AG

Inventor： GRADL REINHARD ,  SCHIMMEL GUENTER

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

Abstract: The disclosure relates to a process for reducing the fluorine content in wet-processed phosphoric acid. To this end, the disclosure provides for an acid extract in an organic solvent to be treated with an at least 45 weight % suspension of aluminum hydroxide of which 99% consist of particles with a size of less than 1 mu m, the balance consisting of particles with a size of less than 10 mu m.

公开(公告)号：DD219466A5

公开(公告)日：1985-03-06

申请号：DD26439084

申请日：1984-06-21

Applicant: HOECHST AG

Inventor： SCHIMMEL GUENTER ,  RESSEL HERBERT ,  HEYMER GERO ,  GRADL REINHARD

IPC: C01B25/30

公开(公告)号：NO910136A

公开(公告)日：1991-07-15

申请号：NO910136

申请日：1991-01-11

Applicant: HOECHST AG

Inventor： SCHIMMEL GUENTER ,  KOTZIAN MICHAEL ,  GRADL REINHARD

IPC: C01B33/32 ,  C01B33/38

CPC classification number: C01B33/38

公开(公告)号：MX162910B

公开(公告)日：1991-07-08

申请号：MX20197984

申请日：1984-07-11

Applicant: HOECHST AG

Inventor： SCHIMMEL GUENTER ,  GRADL REINHARD ,  HEYMER GERO

IPC: C01B25/234 ,  C01B25/235 ,  C01B25/237 ,  C01B25/46

公开(公告)号：CA1191700A

公开(公告)日：1985-08-13

申请号：CA406297

申请日：1982-06-29

Applicant: HOECHST AG

Inventor： SCHIMMEL GUENTER ,  KRAUSE WERNER ,  GRADL REINHARD

IPC: C02F1/26 ,  C01B25/238 ,  C02F1/62 ,  C22B3/00 ,  C22B3/38

Abstract: PROCESS FOR EXTRACTING HEAVY METAL IONS FROM AQUEOUS SOLUTIONS The disclosure relates to a process for liquid/ liquid-extraction of heavy metal ions from acid aqueous solutions with the aid of water-insoluble dithiophosphoric acid diesters as extracting agents. More particularly, use is made of phosphoric acid solutions with a P2O5content of from 3 to 80 weight %, the solutions being free from emulsion-forming organic contaminants or having previously been freed therefrom in known manner. The resulting aqueous phase is separated from the phase containing the dithiophosphoric acid diester.