Nitrate → Strontium nitrate

In addition, the following method for purifying strontium nitrate is disclosed in U.S. Pat. No. 3,065,052: an aqueous solution of strontium nitrate containing barium impurities is prepared, this solution is gradually adjusted to at least the neutral range with nitric acid, the adjusted solution is mixed with a chromic acid solution to produce a strongly acidic solution, a strontium hydroxide solution is gradually added to the resulting solution containing a nitrate and an acid to adjust the pH to 11 while this solution is agitated, this pH is kept unchanged for several minutes to allow the barium impurities to precipitate as barium chromate, the solution is then filtered to remove the barium chromate, nitric acid is subsequently added to the filtrate to gradually bring the pH to about 1 while the filtrate is boiled, and the filtrate is then evaporated to precipitate strontium nitrate crystals, yielding strontium nitrate having the following average composition: 99.85% Sr(NO3)2, 0.05% Ba(NO3)2, 0.004% NaNO3, Ca(NO3)2 (undetected), and the like.

1. customIn addition, the following method for purifying strontium nitrate
2. addition3,065,052: an aqueous solution of strontium nitrate containing barium impurities
3. customis prepared
4. customto produce a strongly acidic solution
5. waitthis pH is kept unchanged for several minutes
6. customto precipitate as barium chromate
7. filtrationthe solution is then filtered
8. customto remove the barium chromate, nitric acid
9. additionis subsequently added to the filtrate
10. customthe filtrate is then evaporated
11. customto precipitate strontium nitrate crystals

ORD 기록

ord-612fade5eeba4f1aad5886dff134d621

출처 데이터셋

uspto-grants-2001_04

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US06221322B1