Molecular Formula | K2NO7S2* |
Molar Mass | 268.33 |
Storage Condition | 2-8°C |
Use | Deoxygenation reagent, often used to oxidize phenol and aniline derivatives to form quinone. |
Risk Codes | R14 - Reacts violently with water R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. R14/15 - |
Safety Description | 36 - Wear suitable protective clothing. |
UN IDs | UN 2813 4.3/PG 1 |
WGK Germany | 3 |
RTECS | QZ1300000 |
HS Code | 28429080 |
Hazard Class | 4.3 |
Packing Group | II |
during mass recrystallization by refining method [I], the crude Fremy salt is suspended in 2M potassium salt (regardless of which potassium salt is selected) solution, heated to completely dissolve, and heated to 50 if necessary, at this time the solubility is about 3g/100 ml solution. The solution is filtered, cooled overnight, and cooled in an ice bath for 2 hours to completely crystallize. Filter out the solid, wash with methanol twice, acetone twice, dry air, such as before stored in dry ammonia. 6 batches of recrystallization, each batch of about 10 grams, each batch of mother liquor as the solvent for the next batch of recrystallization. The yield of the analytically pure product can reach 62-65% based on sulfite. The product may contain two crystal forms of Fremy salt.