Process for the preparation of dicalcium phosphate

Details Process for the preparation of dicalcium phosphate Process for the preparation of dicalcium phosphate

1990-05-10

1991-06-18

Heller, Gregory A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423266, 423308, 423311, C01B 1516, C01B 2526

Patent

active

050248251

ABSTRACT:
For the preparation of dicalcium phosphate dihydrate stabilized with dimagnesium phosphate trihydrate and sodium pyrophosphate, an aqueous suspension of calcium carbonate is introduced into a reactor and recirculated by pumping through a high-speed mixer at 3,500 to 8,000 rpm which is in flow connection with the lower and upper portion of the reactor. Into the mixer an amount of phosphoric acid is introduced which is at least sufficient for the quantitative formation of dicalcium phosphate dihydrate and then an oxygen-containing magnesium compound is introduced into the reactor. Finally, lime milk is metered into the reactor up to a maximum pH of 6.9, before the sodium pyrophosphate is added to the reactor. The resulting suspension which has a stabilized dicalcium phosphate dihydrate content of 20 to 33% by weight is spray-dried.
An apparatus for carrying out the process comprises besides a stirred reactor 1 two stirrer-equipped slurry containers (6, 7) and an intermediate container 16 from which a line 17 leads into a spray tower 18 where it ends above an atomizer wheel 19. The spray tower 18 is also the end point for hot air lines 20 and is in flow connection with a filter 22. The bottom of filter 22 is the starting point for a product line 24 via which highly adsorbent dicalcium phosphate dihydrate can be withdrawn.

REFERENCES:
patent: 2977190 (1961-03-01), Yates et al.
patent: 4166839 (1979-09-01), Skauli et al.
patent: 4294621 (1981-10-01), Maurer et al.
patent: 4931272 (1990-06-01), Dany et al.

Affiliated with

Also associated with

Rating

Process for the preparation of dicalcium phosphate does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the preparation of dicalcium phosphate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of dicalcium phosphate will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-144690