sodium formaldehyde sulfoxylate lump
Chemical name: sodium bisulfate formaldehyde
Molecular formula: NaHSO2 · CH2O · 2H2O
Molecular weight: 154.12
Melting point: 64 ° c
Melting heat: 54.84KJ / mol (13.2KCal / mol)
Moisture point: 60% relative humidity
Stability point: less than 50 ℃
Solubility: 20 ℃, 1 carved white block, carved white powder, carved white particles need 1.2 copies of water dissolved (45%)
70 ℃, a carved white block, carved white powder, carved white tablets need 1 part of water dissolved (50%)
Physical properties: carved white block, carved white powder, carved white particles with a strong reducing salt, white condensed lumps or powder, granules, was alkaline protection.
A. Carved white block (powder, grain) easy to damp exotherm, 80 ℃ began to decompose, the release of H2S, need to dry low temperature preservation.
6NaHSO2 • CH2O + 3H2O – → 4NaHSO3 + 2HCOONa + 2H2S + HCOOH + 3CH3OH
B. When the temperature rose to 110 ℃, carved white block (powder, grain) decomposition, the molecules of formaldehyde split release new [H], the strongest reduction force.
NaHSO2 • CH2O – → NaHSO2 + CH2O
NaHSO2 + H2O – → NaHSO2 + 2 [H]
C. Carved white block (powder, grain) is divided into oxidants, such as with the I2.
NaHSO2 • CH2O + 2H2O + 2I2- → NaHSO4 + 4HI + CH2O
D. Carved white block (powder, grain) should be in alkaline medium PH> 8, acid (acid limit PH> 3) can make carved white block decomposition of hydrogen sulfide.
2、Quality standards, implementation standards HG 2281-1992
|Sodium bisulfate formaldehyde content% ≥||98.00|
|Dissolved state||dissolved in water was clear or slightly cloudy|
|Sulfide||does not show black|
|Odor||Odorless or little leek flavor|
|Usage||is mainly used in the printing and dyeing industry for the discharge agent, coloring agent, reducing agent and used as styrene-butadiene rubber and synthetic resin activator|
With lined with plastic film bags, sealed tight iron drum, net weight 50 kg per barrel. Carved white powder and another 25 kg bag.
Mainly used in the printing and dyeing industry for the discharge agent, coloring agent, reducing agent and used as styrene-butadiene rubber and synthetic resin activator, but also for some organic decolorization and bleaching (such as: synthetic rubber, sugar, food industry bleaching Agent), under certain conditions can replace the use of insurance powder. Can not be used for imported food bleaching.
5, transport, storage Note:
Carved white pieces of finished barrels should be stored in a dry and cool place to prevent sunlight exposure, rain, not with oxidants and acids mixed together, the storage room does not contain acid vapor, storage period of one year.