Phosphoric Acid → Phosphoric acid, barium salt (2:3)

Temperature

68 °C

Barium phosphate was prepared by the following procedure. Barium hydroxide (31.23 grams of Ba(OH)2 8H2O, 0.099 moles) was dissolved in 500 grams of deionized water and added to a 1 liter reaction flask fitted with a magnetic stirring bar, reflux condensor and dropping funnel. The hazy solution was heated to 68° C., and treated dropwise over a 30 minute period with a solution of 7.61 grams of 85%w phosphoric acid (0.066 moles of acid) in 50 grams of deionized water. The resulting milky white mixture was heated further at 80° C. for an additional two hours, then cooled to 25° C. and filtered using a medium porosity glass filter. The white filter cake was washed several times with deionized water until the wash was approximately neutral pH. The solid was dried under vacuum (80mm Hg) at 80° C. for 24 hours. Analysis of the product showed 63 %w Ba and 8.9 %w P (theoretical for Ba3 (PO4)2 is 68.4% Ba and 10.3 %w P), with the remainder presumably water.

1. additionadded to a 1 liter reaction flask
2. customfitted with a magnetic stirring bar
3. temperaturereflux condensor
4. temperatureThe resulting milky white mixture was heated further at 80° C. for an additional two hours
5. temperaturecooled to 25° C.
6. filtrationfiltered
7. filtrationfilter
8. washThe white filter cake was washed several times with deionized water until the wash
9. customThe solid was dried under vacuum (80mm Hg) at 80° C. for 24 hours

ORD record

ord-fc397e95bc244c1a8e83190fc1efca99

Source dataset

uspto-grants-1990_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04967016