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Send EmailBasic Reductant, Thiourea Dioxide, Formamidine Sulfinic Acid, TUDO, FAS, TDO, 1758-73-2, Thiourea, 62-56-6
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Chemical Name: Formamidine Sulfinic Acid
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CAS No: 1758-73-2
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EC No: 217-157-8
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Molecular Formula: CH₄N₂O₂S
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Appearance: White crystalline powder
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Packaging: 50 kg bags
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Function: Powerful reducing agent
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Reactivity: Gradual decomposition into sulfoxylate under heat or alkaline conditions
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pH Range: Active in acidic to mildly alkaline media
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Applications:
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Removal of faulty dyes
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Discharge printing processes
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Reductive washing of polyester fibers
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Bleaching of cotton, polyamide, wool, and silk
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📋 Teknik Tanım / Technical Description
| Özellik / Property | Değer / Value |
|---|---|
| Kimyasal Adı / Name | Tiyoure / Thiourea |
| CAS No | 62-56-6 |
| EINECS No | 200-543-5 |
| Moleküler Formül | CH₄N₂S veya (NH₂)₂CS |
| Görünüm / Appearance | Beyaz kristal toz / White crystalline powder |
| Saflık / Purity | ≥99.0% |
| Ergime Noktası / Melting Point | 171–175 °C |
| Yoğunluk / Density | 1.914 g/cm³ |
| Suda Çözünürlük / Water Solubility | 13.6 g/100 ml (20 °C) |
| Ambalaj / Packaging | 25 kg torba / 25 kg bag |
| Menşei / Origin | Çin / China |
| Tedarik Kapasitesi / Supply Capacity | 100,000 kg/yıl |
| Marka / Brand | Watson |
| Sınıf / Grade | Endüstriyel / Industrial |
| Sınıflandırma / Classification | Sülfürlü bileşik / Sulfide |
📊 Spesifikasyon Tablosu / Specification Table
| Parametre / Parameter | Birim / Unit | Şartname / Spec | Sonuç / Result |
|---|---|---|---|
| Görünüm / Appearance | — | Beyaz kristal | Uygun ✅ |
| Saflık / Assay | % (w/w) | ≥99.0 | 99.08 |
| Azot / Nitrogen | % (w/w) | ≥35.0 | 36.4 |
| Kükürt / Sulfur | % (w/w) | ≥40.0 | 41.6 |
| Isı Kaybı / Loss on Heating | % (w/w) | ≤0.4 | 0.3 |
| Suda çözünmeyen / Insolubles | % (w/w) | ≤0.02 | 0.02 |
| Kül / Ash | % (w/w) | ≤0.1 | 0.07 |
| Ergime Noktası / Melting Pt. | °C | ≥171 | 172 |
🧪 Essential Sectoral Applications – Thiourea Dioxide vs Thiourea
| Sector / Process | Thiourea Dioxide (TDO, FAS, CAS 1758-73-2) | Thiourea (CAS 62-56-6) |
|---|---|---|
| 🔬 Discharge Printing (Textile) | ✅ Essential reducing agent – irreplaceable for color removal | ❌ Not applicable |
| 🧵 Reductive Washing of Polyester Fibers | ✅ Required for removing oxidative residues | ❌ Ineffective |
| 🧪 CMC Production (Carboxymethyl Cellulose) | ✅ Key intermediate for sulfoxylate generation | ❌ Not used |
| 🧼 Bleaching of Cotton, Wool, Silk | ✅ Controlled reduction – no direct substitute | ❌ Not suitable |
| ⚗️ Resin Synthesis / Formaldehyde Reactions | ❌ Not involved | ✅ Essential crosslinker and accelerator |
| ⚙️ Rubber Vulcanization | ❌ Not applicable | ✅ Critical accelerator – no alternative |
| ⛏️ Mineral Flotation (Ore Separation) | ❌ Not used | ✅ Key flotation agent for sulfide ores |
| 📷 Photography (Developer Chemistry) | ❌ Not applicable | ✅ Required reducing agent in film baths |
| 🧪 Protein Precipitation (Lab Use) | ❌ Not used | ✅ Used with TCAA for precipitation |
| 🌾 Pesticide / Fungicide Manufacturing | ❌ Not relevant | ✅ Essential intermediate in thiourea-based actives |
🔍 Summary
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Thiourea Dioxide (TDO) is indispensable in textile and cellulose chemistry, especially for discharge printing, reductive washing, and bleaching. Its slow, controlled decomposition makes it ideal for sensitive processes.
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Thiourea plays a critical role in rubber, resin, mining, and agrochemical sectors, where its fast reactivity and sulfur content are essential. It cannot be replaced in vulcanization or flotation applications.
