Thiourea Dioxide

Basic Information of Thiourea Dioxide

CAS No.:	1758-73-2
EC No.:	217-157-8
Linear Formula:	CH₄N₂O₂S
Molecular Weight:	108.12
Appearance:	White crystalline powder
Melting Point:	124-127 °C (dec.)(lit.)
Boiling Point:	355.3±25.0 °C(Predicted)
Density:	1.68
Solubility:	Moderately soluble in water; sparingly soluble in alcohol.
Reducing Power:	Exhibits strong reducing power, particularly in alkaline solutions.
Stability:	Relatively stable in dry form. More stable than sodium dithionite in solution.
Environmental Profile:	Biodegradable and less polluting compared to sulfur-containing reducing agents, as it primarily decomposes into urea, sulfate, and carbon dioxide.
RIDADR:	UN 3341 4.2/PG 2
Chemical Structure:

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Primary Applications of Thiourea Dioxide (TDO)

Thiourea Dioxide's powerful reducing and bleaching capabilities, coupled with its favorable environmental profile, make it an incredibly valuable compound with applications across several industries:

1. Textile Industry:

   It is widely used as a reducing agent in vat dyeing and sulfur dyeing processes, helping to dissolve insoluble dyes and fix them onto fibers. It also serves as a highly effective bleaching agent for wool, silk, and other natural and synthetic fibers, improving whiteness without damaging the fabric. Furthermore, it acts as a desizing agent to remove sizing from fabrics.

2. Paper Industry:

   TDO is a key chemical for deinking waste paper, effectively removing printing inks from recycled pulp to produce brighter, higher-quality recycled paper. It also functions as a bleaching agent for pulp, improving paper whiteness.

3. Wastewater Treatment:

   It is increasingly used in wastewater treatment as a reducing agent to remove heavy metal ions (e.g., chromium, copper), dyes, and other pollutants from industrial effluents. Its ability to reduce hexavalent chromium to trivalent chromium is particularly important for environmental protection.

4. Chemical Synthesis:

   TDO serves as a selective reducing agent in various organic synthesis reactions, particularly in the production of pharmaceuticals, fine chemicals, and agrochemicals where precise reduction is required.

5. Photography:

   In some photographic processes, Thiourea Dioxide can be used as a component in certain developing or toning solutions.

• Commitment to Quality & Safety: We adhere to the highest industry standards for quality management, safety, and environmental responsibility across all our operations, ensuring peace of mind for our clients.

Hazards Classification

• GHS Classification: Acute Toxicity (GHS06), Skin Corrosion/Irritation (GHS07), Self-Reactive Substances (GHS01)

• Hazard Statements: Harmful if swallowed; causes skin irritation and serious eye irritation; may cause fire or explosion, strong reducing agent.

• UN Number: UN 3341

• Hazard Class: 4.2 (Spontaneously Combustible)

• Packing Group: II