SYNTECH

1. Basic Definition & Identity

Full Chemical Name

IUPAC: Sodium prop-2-ene-1-sulfonate

Common aliases: Sodium Allylsulfonate, ALS, SAS, Allylsulfonic Acid Sodium Salt

Core Chemical Information

• CAS No.: 2495-39-8
• EINECS: 219-676-5
• Molecular Formula: C₃​H₅​NaO_3​S
• Molecular Weight: 144.12 g/mol
• MDL No.: MFCD00051416
• SMILES: C=CCS(=O)(=O)[O-].[Na+]

Brief Introduction

Sodium Allyl Sulfonate is a bifunctional water-soluble anionic organic salt. It carries two key reactive functional groups:

1. Hydrophilic anionic sulfonate group −SO₃​Na: provides water solubility, surface adsorption, ionic dispersibility
2. Unsaturated allyl vinyl group CH₂​=CH−CH_2​−: free-radical copolymerizable monomer, enables covalent bonding in polymer synthesis

It exists commercially in two forms:

• Solid: White crystalline powder (95%–98% purity)
• Liquid: 35 wt% transparent aqueous solution (main industrial grade for electroplating)

2. Molecular Structure

2D Structural Diagram

2D Skeletal Structure

Ball-and-Stick Model

Structural Breakdown

CH₂​=CH−CH_2​−SO₃−​Na+

1. Terminal carbon-carbon double bond (allyl reactive site for polymerization)
2. Methylene linker −CH₂​− connecting alkene and sulfonate
3. Negatively charged sulfonate anion −SO₃−​ bonded to sodium cation Na+ (high polarity, full water miscibility)

Key Structural Feature

The dual reactive groups determine all its industrial functions: copolymerization modifier, electroplating brightener, dispersant, textile auxiliary.

3. Core Physical & Chemical Properties

1. Appearance
   • Solid: Odorless white crystal/granule
   • 35% liquid: Colorless to pale yellow transparent liquid
2. Melting Point: 242 °C (decomposes above 300 °C, no boiling point)
3. Solubility: Fully soluble in water, methanol, ethanol; insoluble in alkanes
4. pH (1% aqueous): 6.5–9.0 (weak neutral to mild alkaline)
5. Thermal Stability: Dry solid stable at room temp; aqueous solution prone to self-polymerization under prolonged heating
6. Chemical Stability: Stable under normal storage; incompatible with strong oxidants and concentrated strong acids

4. Main Industrial Applications

1. Electroplating (Largest Consumption)Primary auxiliary brightener for acid nickel plating: refines metal grain, improves throwing power, eliminates dark low-current areas; also used in acid copper, zinc, Ni-Co alloy plating baths.
2. Polymer Co-monomer
   • Acrylic fiber third monomer: boosts dye uptake and antistatic performance
   • Water treatment scale inhibitor: copolymerized with acrylic acid/acrylamide to produce calcium salt dispersants
   • Emulsion polymerization emulsifier & chain transfer agent
3. Textile & DyeingAntistatic agent, leveling auxiliary for dyeing
4. Organic Synthesis Intermediate

5. MSDS (SDS) Introduction & Download Links

GHS Hazard Classification (Standard SDS Content)

• Signal Word: Warning
• Hazard Statements:H315: Causes skin irritationH319: Causes serious eye irritationH335: May cause respiratory irritation
• Precautionary Statements: Wear eye/skin protection; rinse thoroughly after contact; avoid inhalation of dust
• Environmental Note: Harmful to aquatic life with long lasting effects; avoid direct discharge to water bodies

Official Free MSDS Download URLs

How to Get Manufacturer Custom MSDS

If you need factory-specific SDS matching 35% liquid or high-purity solid SAS:

1. Contact your chemical supplier to request product-specific MSDS (includes production batch impurity data)
2. Search industrial chemical platforms: Guidechem, Alfa Chemistry, Sigma-Aldrich with CAS 2495-39-8 for brand-tailored safety documents

6. Storage & Handling Rules (From MSDS)

• Store in cool, dry, ventilated warehouse, sealed tightly; isolate from oxidants
• Solid powder: Prevent moisture absorption
• Liquid ALS: Avoid direct sunlight and high-temperature storage
• Packaging: 25kg woven bag (solid); 25kg HDPE plastic drum (35% liquid)
• Shelf life: 24 months under intact sealed packaging