sodium formaldehyde sulfoxylate lump
Chemical name: sodium bisulfate formaldehyde
Molecular formula: NaHSO2 · CH2O · 2H2O
Molecular weight: 154.12
Weight: 1.8
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.
Chemical properties:
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
| Item | Index |
| 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 |
3, Packing:
With lined with plastic film bags, sealed tight iron drum, net weight 50 kg per barrel. Carved white powder and another 25 kg bag.
4, use:
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.
