Rongalite C / Sodium Formaldehyde Sulfoxylate

Solubility

45%(20 °C):1.2 dose of water is necessary for dissolving away 1 dose of Rongalite at 20°C. 50%(70 °C):1 dose of water is necessary for dissolving avay 1 dose of Rongalite at 70°C.

Chemical Properties

Presenting a powerful reduction behaviour, it acts as a salt of alkaline protection.
a. Easy to deliquescent, emit heat, begin to decompose at 80°C, and sulfurated hydrogen H2S being release:
6NaHSO2·CH2O+3H2O — →4NaHSO3+2HCOONa+2H2S+HCOOH+3CH3OH
b.Decompose completely when the temperature rises to 110°C, the intramolecular formaldehyde are splitted out, and then nascent hydrogen which is possessed of the strongest reducing power are produced :
NaHSO2·CH2O —→ NaHSO2+ CH2O
NaHSO2 + H2O —→ NaHSO2+ 2[H]
c.Under the influence of acidity, decompose at PH >3, emit H2S, so that it sould be present in alkline medium PH >8.
d.Decompose on contacting oxidant, take I2 for example:
NaHSO2·CH2O+2H2O+2I2 —→ NaHSO4+4HI+CH2O

Application

It is mainly used as a discharging agent, color-discharging agent, reductant in printing and dyeing industry, as an activating agent for production styrene-butadise rubber and synthetic resin, also be used to decolourize and bleach some organic matters, for example: as a bleaching agent in synthetic rubber, sugar-making, and food industries. It may be substituted for the sodium hydrosulfite in some special conditions.

Storage

Should be stored in a dry, cool and dark place. Protected from moisture, avoided exposure to direct sunshine. Don’t to let it be rained on. Be sure not to store it together with oxidant and acid, no presence of acidic vapour in storage life is one year.