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Hypophosphorous Acid Suppliers and Factory in China - CAS 6303-21-5 H4P2O6 Dihydrate
Disulfuric acid, also known as "secondary hypophosphoric acid", is a colorless oily or deliquescent crystal. It is an important product in fine chemicals. Disulfuric acid is a reducing agent and a strong monoprotic acid. Its aqueous solution is acidic and it can gradually oxidize in the air at room temperature.
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Chemical Reactivity
Contact with H2O2 will cause combustion. It will also burn when reacting vigorously with oxidants.
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Safety Warning
It can decompose into highly toxic phosphine gas under high heat, even causing explosion. It is corrosive.
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Thermal Stability
When the solid acid is heated to 130-140℃, it will undergo disproportionation decomposition into PH3 and H3PO4.
Product Characteristics & Applications
Disulfuric acid is often added to soft drinks because it is not absorbed. Therefore, it has low danger, but very concentrated disulfuric acid can harm the gastrointestinal tract. It is a rather strong monoprotic acid (K = 9×10-2). Its main uses are as a reducing agent for chemical plating, to prevent the discoloration of phosphoric resin, and can also be used as a catalyst in esterification reactions, refrigerants, especially for the production of high-purity disodium disulfide.
There are various preparation methods for disulfuric acid, among which the common industrial preparation methods include ion exchange resin method and electrodialysis method, etc.
Frequently Asked Questions
What are the primary industrial uses of Disulfuric acid?
It is mainly used as a reducing agent for chemical plating, a catalyst in esterification reactions, a refrigerant, and to prevent the discoloration of phosphoric resin.
Is Disulfuric acid safe to use in food and beverages?
It is often added to soft drinks because it is not absorbed by the body, making it low danger at appropriate concentrations. However, highly concentrated forms can harm the gastrointestinal tract.
What happens if Disulfuric acid is exposed to high heat?
Under high heat (130-140℃), it undergoes disproportionation decomposition into highly toxic phosphine gas (PH3) and phosphoric acid (H3PO4), which may cause explosions.
How does Disulfuric acid react with other chemicals?
It is a strong reducing agent. It will burn when in contact with H2O2 or when reacting vigorously with other oxidants.
What are the common industrial preparation methods?
The most common industrial methods for preparing disulfuric acid include the ion exchange resin method and the electrodialysis method.
What is the acidity level of Disulfuric acid?
It is a rather strong monoprotic acid with an acid dissociation constant (K) of 9×10-2.