Process for producing high purity phosphates

Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C423S157300, C423S309000, C423S312000

Reexamination Certificate

active

07374740

ABSTRACT:
Phosphate rock is reacted with phosphoric acid to produce monobasic calcium phosphate. Monobasic calcium phosphate is reacted with ammonium carbonate to produce ammonium phosphate. Dibasic calcium phosphate is also produced as a by-product when monobasic calcium phosphate reacting with ammonium carbonate. The dibasic calcium phosphate is reacted with sulfuric acid to produce phosphoric acid. The phosphoric acid is used to react with phosphate rock. Ammonium sulfate or ammonium hydroxide may be used instead of ammonium carbonate. Phosphate other than ammonium phosphate can be produced if calcium phosphate is reacted with x-y to produce x-phosphate, where x is lithium, sodium, ammonium or potassium and y is carbonate, bicarbonate hydroxide or sulfate.

REFERENCES:
patent: 4160657 (1979-07-01), Drechsel
patent: 4678649 (1987-07-01), Alexander et al.
patent: 4704263 (1987-11-01), Berry et al.
patent: 4885148 (1989-12-01), Erickson et al.
patent: 0488736 (1992-06-01), None
Joseph A. Babor, Basic College Chemistry (1947), Thomas Y. Crowell Company, p. 298, no month.
C. A. Jacobson, Encyclopedia of Chemical Reactions (1948), Reinhold Publishing Company, pp. 118, 119, no month.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Process for producing high purity phosphates 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 producing high purity phosphates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing high purity phosphates will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3982941

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.