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Ultra-high reactivity for rapid sulfonation of aromatic and aliphatic compounds.
Consistent 100% SO₃ content in stabilized liquid form—no diluent or carrier solvents.
Engineered with proprietary thermal stabilization to minimize decomposition during storage and metering.
Low vapor pressure at ambient temperature, enabling safer handling versus gaseous SO₃.
Compatible with precision continuous-feed sulfonation reactors and inline quench systems.
Manufacture of linear alkylbenzene sulfonates (LAS) for biodegradable detergents.
Sulfonation of phenols and naphthols to produce dye intermediates and pharmaceutical precursors.
Production of sulfated vegetable oils and fatty alcohol sulfates (FAS) for personal care formulations.
Catalytic sulfation in specialty polymer synthesis, including sulfonated polyethers and ion-exchange membranes.
In-situ generation of chlorosulfonic acid for high-selectivity electrophilic substitutions.
| Chemical Type | Sulfur trioxide (SO₃), stabilized liquid form |
| Product Form | Clear, colorless to pale yellow mobile liquid |
| Appearance | Homogeneous, free from suspended solids or phase separation |
| Melting Point | 16.8 °C (62.2 °F) |
| Boiling Point (at 760 mmHg) | 44.8 °C (112.6 °F) |
| Primary Applications | Continuous sulfonation, fine chemical synthesis, surfactant manufacturing |
| Key Features | 100% active SO₃; low residual sulfuric acid (<0.05%); controlled exotherm profile |
| Regulatory Compliance | REACH registered; TSCA listed; compliant with OSHA HCS 2012 and GHS hazard classification |
| Common Compatible Systems | Suitability |
| Stainless Steel 316L Sulfonation Reactors | Highly Recommended – Excellent corrosion resistance with proper passivation and moisture control |
| Carbon Steel Metering Pumps (with inert gas purge) | Recommended – Requires strict anhydrous operation and pre-chill to prevent solidification |
| PTFE-Lined Piping & Valves | Highly Recommended – Chemically inert and thermally stable up to 120 °C |
| Inline Static Mixers (Sulzer SMX type) | Suitable – Effective for rapid mixing with organic substrates when pre-cooled to 10–20 °C |
Q1: What is the CAS Registry Number for Liquid Sulfur Trioxide?
A: The CAS Number for sulfur trioxide (liquid form) is 7446-11-9. Note that this identifier applies to the pure compound; stabilized commercial grades may carry additional manufacturer-specific identifiers.
Q2: How does Liquid SO₃ compare to oleum or gaseous SO₃ in sulfonation efficiency?
A: Liquid SO₃ offers higher atom economy and no water byproduct (unlike oleum), enabling cleaner reactions and reduced neutralization waste. Versus gaseous SO₃, it provides superior dosing accuracy, lower system complexity, and improved safety in enclosed continuous processes.
Q3: Is Liquid Sulfur Trioxide subject to FDA or EU food-contact migration limits?
A: Liquid SO₃ itself is not permitted for direct food contact. However, its reaction derivatives (e.g., LAS, FAS) used in cleaning agents for food-processing equipment must comply with FDA 21 CFR §178.1010 and EU Regulation (EC) No 1935/2004, requiring rigorous residual SO₃ and sulfate testing per validated methods (e.g., ASTM D4292).
Q4: What are the key storage requirements to maintain stability and purity?
A: Store under dry nitrogen blanket at 20–25 °C in sealed, passivated stainless steel containers. Avoid exposure to moisture, rust, or alkaline surfaces. Shelf life is 6 months from date of manufacture when stored per specification.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
