C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/67
C01B 25/30 (2006.01)
Patent
CA 1324480
ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the manufacture of disodium phosphate of a high purity without utilizing organic solvents. According to the process, monosodium sulfate is reacted, at a temperature in the range of 40 to 100 degrees C with a phosphate constituent selected from phosphate rock, dicalcium phosphate or mixtures thereof, in the presence of phosphoric acid. The common metal impurities, organic matter and fluorides present in the starting phosphate rock are substantially complete eliminated with the solid gypsum or dicalcium phosphate resulted thereto. After separating said solid, the filtrate is treated in two neutralization stages: first by a calcium constituent selected from calcium carbonate, calcium hydroxide or mixtures thereof and separating the formed dicalcium phosphate,followed by a second neutralisation with an alkali sodium constituent selected from sodium hydroxide, sodium carbonate and sodium bicarbonate or mixtures thereof at a pH in the range of 8,0 to 9.5. From the resulted filtrate, pure disodium phosphate is obtained by crystallization. The process is characterized by a high recovering of the P2O5 and Na2O values, the resulted product being substantially free of chloride ion.
514046
Bar-On Menachem
Iosef Alexander
Rotem Amfert Negev Ltd.
Sim & Mcburney
LandOfFree
Process for the manufacture of disodium 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 manufacture of disodium phosphate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the manufacture of disodium phosphate will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1296763