Polymerization Inhibitor 701 (TEMPO / 4-Hydroxy-TEMPO) – High-Efficiency Free Radical Scavenger for Monomer Stabilization
What is Polymerization Inhibitor 701 (TEMPO)?
Polymerization Inhibitor 701 (CAS 2226-96-2), also known as TEMPO or 4-Hydroxy-TEMPO (TEMPOL), is a nitroxide radical inhibitor widely used in the chemical industry for monomer stabilization and free radical polymerization control.
It is one of the most efficient free radical scavengers for industrial monomers, especially in:
- Acrylic acid (AA)
- Methyl methacrylate (MMA)
- Styrene (SM)
- Acrylonitrile (AN)
- Butadiene (BD)
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Chemical & Physical Properties of TEMPO 701
Basic Chemical Information
- Chemical Name: 4-Hydroxy-2,2,6,6-tetramethylpiperidinooxy
- CAS Number: 2226-96-2
- Molecular Formula: C₉H₁₈NO₂
- Molecular Weight: 172.24 g/mol
Physical Properties
| Property | Value |
|---|---|
| Appearance | Orange-red crystalline powder |
| Melting Point | 69–73°C |
| Solubility | Water, alcohol, acetone |
| Stability | Stable nitroxide radical |
| Storage | Cool, dry, sealed container |
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How TEMPO 701 Works (Free Radical Inhibition Mechanism)
TEMPO is a radical polymerization inhibitor that works by capturing carbon-centered radicals.
Radical Scavenging Reaction
R· + TEMPO → Stable non-propagating adduct
Chain Reaction Blocking
TEMPO prevents:
- Initiation of polymerization
- Radical chain propagation
- Thermal runaway reactions
Redox Stability
TEMPO operates through reversible oxidation states:
TEMPO ⇄ TEMPO⁺ ⇄ TEMPO-H
This makes it a long-lasting industrial monomer stabilizer.
Industrial Applications of Polymerization Inhibitor 701
Acrylic Acid & MMA Stabilization
Used as an acrylic acid inhibitor and MMA polymerization inhibitor, TEMPO prevents:
- Storage tank polymerization
- Transportation hazards
- Distillation fouling
Styrene Distillation Protection
In styrene purification plants, TEMPO is used to:
- Prevent polymer deposits in distillation towers
- Improve product purity
- Reduce fouling in pipelines
Acrylonitrile & Butadiene Systems
- Controls free radical reactions
- Improves monomer stability
- Enhances industrial safety
Resin & Coating Industry
- Anti-oxidation additive
- Shelf-life extender
- Free radical stabilizer
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Recommended Dosage (Industrial Standard)
| Application | Dosage |
|---|---|
| Monomer storage | 10–200 ppm |
| Distillation systems | 50–500 ppm |
| Polymerization control | 100–1000 ppm |
Standard industrial range:50–100 ppm (monomer stabilization systems)
Compatibility with Other Polymerization Inhibitors
MEHQ / HQ (Phenolic Inhibitors)
- TEMPO: radical scavenger
- MEHQ: oxygen-based inhibition
Strong synergy for:
- Acrylic acid
- MMA systems
Copper Salt Systems
- CuO / Cu(II) salts
👉 Used in: - Styrene
- Butadiene systems
Peroxide Systems (Important Warning)
⚠ TEMPO inhibits radical initiators such as:
- AIBN
- Benzoyl peroxide (BPO)
Not suitable for polymerization initiation systems
Handling, Storage & Safety
- Store in cool, dry, sealed containers
- Avoid oxidizing agents
- Ensure uniform dispersion before dosing
- Add before polymerization starts
- Use PPE and ventilation systems
- Avoid overdose (ppm control critical)
Why Choose Ecochemchina TEMPO 701?
High Purity Polymerization Inhibitor
- High active content
- Low impurities
- Low metal ion contamination
Ensures stable performance in sensitive monomer systems
Stable Batch Quality for Industrial Use
- Strict production control
- Consistent ppm performance
- Reliable global supply
Optimized for Industrial Monomer Systems
Compatible with:
- Acrylic acid inhibitor systems
- MMA inhibitor systems
- Styrene distillation systems
Technical Support for Global Customers
We provide:
- Dosage optimization guidance
- Process application solutions
- Custom inhibitor blending support
Global Chemical Supplier Capability
- Stable export supply chain
- Flexible packaging (small & bulk)
- Competitive industrial pricing
Conclusion
Polymerization Inhibitor 701 (TEMPO / 4-Hydroxy-TEMPO) is a highly efficient nitroxide radical scavenger used for monomer stabilization, polymerization control, and industrial safety protection.
Its ppm-level efficiency, broad compatibility, and strong thermal stability make it one of the most important industrial monomer inhibitors in modern chemical production.
Choosing Ecochemchina TEMPO 701 ensures:
- Higher purity
- Better process stability
- Safer industrial operation
Website:https://www.ecochemchina.com
WhatsApp:+86 18921308539
Email:ecochemchina@gmail.com
