公开(公告)号：PH21066A

公开(公告)日：1987-07-10

申请号：PH30835

申请日：1984-06-18

Applicant: HOECHST AG

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

IPC: C01B25/237 ,  C01B25/30 ,  C01B25/10

Abstract: The disclosure relates to a process for defluorinating alkali metal phosphate solutions. To this end, the disclosure provides for an alkali metal phosphate solution neutralized to a pH-value of more than 6 and pre-purified to be stirred at 60 DEG to 120 DEG C. into an alkaline earth metal compound. Alkaline earth metal compounds with a solubility in water of less than 5 g/l are used in the form of particles of which more than 50% have a size of less than 8 mu m. After a reaction period of 0.5 to 4 hours, the precipitate obtained is separated from the purified alkali metal phosphate solution.

公开(公告)号：IN169199B

公开(公告)日：1991-09-14

申请号：IN40MA1987

申请日：1987-01-21

Applicant: HOECHST AG

Inventor： GUNTHER SCHIMMEL ,  FRIEDRICH KOLKMANN ,  REINHARD GRADL ,  HERBERT RESSEL

IPC: C01B25/222 ,  C01B25/01 ,  C01B25/22 ,  C01B25/223