Sodium Allyl Sulfonate (SAS / ALS)
CAS No.: 2495-39-8 | IUPAC: Sodium prop-2-ene-1-sulfonate
1. Product Identification
| Item | Details |
|---|---|
| Chemical Name | Sodium Allyl Sulfonate |
| Abbreviation | SAS, ALS |
| CAS Number | 2495-39-8 |
| EINECS | 219-676-5 |
| Molecular Formula | C₃H₅NaO₃S |
| Molecular Weight | 144.12 |
| SMILES | C=CCS(=O)(=O)[O-].[Na+] |
| Two Industrial Grades | 35% Aqueous Liquid; 98–99% Anhydrous Powder |
2. Physical & Chemical Properties
2.1 35% Liquid Grade (Electroplating Grade)
| Test Parameter | Specification |
|---|---|
| Active SAS Content | 35.0 ± 0.5 wt% |
| Appearance | Colourless to pale yellow transparent liquid |
| Density (20℃) | 1.19–1.28 g/cm³ |
| pH Value (Undiluted) | 6.0 – 8.0 |
| Sodium Chloride (NaCl) | ≤1.0 wt% |
| Sodium Sulfite (Na₂SO₃) | ≤0.30 wt% |
| Iron (Fe) | ≤5 ppm |
| APHA Colour | ≤150 |
| Solubility | Miscible with water in all ratios |
| Storage Shelf Life | 18 months sealed |
2.2 99% Powder Grade (Polymer High-Purity Grade)
| Test Parameter | Specification |
|---|---|
| Active SAS Purity (dry base) | ≥99.0 wt% |
| Appearance | White crystalline powder/granule |
| Bulk Density | ~1.21 g/cm³ |
| pH (1% aqueous solution) | 7.0 – 9.0 |
| Sodium Chloride (NaCl) | ≤0.8 wt% |
| Sodium Sulfite (Na₂SO₃) | ≤0.08 wt% |
| Iron (Fe) | ≤3 ppm |
| Moisture Content | ≤0.8 wt% |
| Melting Point | 242℃ (decomposes over 300℃) |
| Solubility | Fully soluble in water, ethanol; insoluble in alkanes |
| Storage Shelf Life | 24 months vacuum-sealed |
3. Chemical Characteristic
Dual functional groups:
- Allyl vinyl group (CH₂=CH–): Free radical copolymerizable monomer
- Sulfonate anion (–SO₃Na): Strong hydrophilicity, surface adsorptionCompatible with acrylic monomers, acrylamide, acrylic acid; Incompatible with strong oxidants and concentrated strong acid.
4. Typical Industrial Applications
- Electroplating: Main brightener for acid nickel plating; grain refiner for Cu, Zn, Ni-Co alloy baths
- Polymer Industry: Third monomer for acrylic fiber; co-monomer for water treatment scale inhibitors & dispersants
- Textile Auxiliaries: Antistatic agent, dye levelling agent
- Emulsion polymerization modifier & fine chemical intermediate
5. Recommended Dosage
- Nickel electroplating bath: 0.1 – 5 g/L
- Water treatment copolymer synthesis: 2 – 8 mol% of total monomers
- Acrylic fiber production: 3 – 5 wt% addition
6. Packaging Specification
- 35% Liquid: 25kg HDPE plastic drum, 1000L IBC tote tank
- 99% Powder: 25kg plastic-lined woven bag / aluminium foil vacuum bag
7. Storage & Handling Instructions
- Store in cool, dry, ventilated warehouse, away from direct sunlight and heat sources
- Liquid grade: Prevent freezing below 0℃ to avoid crystallization blockage
- Powder grade: Keep tightly sealed to prevent moisture absorption and caking
- Isolate from strong oxidizers, strong acid and food chemicals
- Wear safety goggles, gloves and dust mask during operation; flush with plenty of water once splashed on skin or eyes
8. Supporting Documents Available
- COA (Certificate of Analysis) per batch
- SDS / MSDS in English & Chinese
- Customs clearance documents for export
- Customized impurity index service on request
