Overview
1,4-Dioxane, commonly referred to as dioxane, is a versatile cyclic ether solvent with broad industrial applications. It is synthesized through the acid-catalyzed dehydration of ethylene glycol or as a byproduct in ethylene oxide production. Its high solvency and water miscibility make it valuable in pharmaceuticals, adhesives, and textile processing. Despite its utility, dioxane is classified as a Group 2B carcinogen (possibly carcinogenic to humans) by IARC. Regulatory bodies like the EPA impose strict limits on its residual presence in consumer products, particularly cosmetics and detergents, due to environmental persistence and groundwater contamination risks.
Physical and Chemical Properties
Dioxane is a colorless, hygroscopic liquid with a faint ether-like odor. Its cyclic structure (C₄H₈O₂) confers stability and low reactivity under standard conditions, though it forms explosive peroxides when exposed to air over time. The compound’s high dipole moment (1.5–1.6 D) enables excellent solvency for polar and nonpolar substances. Key thermal properties include a boiling point of 101.1°C and flash point of 12°C (closed cup), necessitating careful handling to avoid flammability hazards. It forms an azeotrope with water (boiling point 87.8°C, 82% dioxane), complicating purification processes.
Main Applications
Dioxane’s primary use is as an industrial solvent for cellulose acetate, dyes, and synthetic resins. In pharmaceuticals, it aids in polymer synthesis and acts as a reaction medium for APIs. The electronics industry employs it for wafer cleaning and photoresist stripping. Historically, it served as a stabilizer for chlorinated solvents like 1,1,1-trichloroethane, though this application has declined due to environmental regulations. Emerging uses include green chemistry research, where modified dioxane derivatives serve as biodegradable solvents.
Safety and Storage
Dioxane requires stringent safety measures due to its flammability and health hazards. Storage areas must be equipped with explosion-proof ventilation and bonded/grounded containers to prevent static discharge. Peroxide formation—a critical risk—can be mitigated by adding inhibitors like BHT or storing under nitrogen. Spills should be contained using non-combustible absorbents (e.g., vermiculite) and disposed of as hazardous waste. OSHA’s permissible exposure limit (PEL) is 100 ppm (8-hour TWA), while NIOSH recommends a lower REL of 1 ppm to minimize carcinogenic exposure.
B2B Procurement Guide
When procuring dioxane, prioritize suppliers with ISO 9001 certification and batch-specific Certificates of Analysis (CoA). Key purchase criteria include purity (≥99.5%), peroxide content (<0.01%), and water content (<0.1%). Bulk shipments (IBCs or drums) typically offer cost advantages for large-scale users. Audit suppliers for compliance with REACH and TSCA regulations. For laboratories, small-volume packaging (1–5 L) with amber glass bottles minimizes degradation risks. Consider alternatives like tetrahydrofuran (THF) for peroxide-sensitive applications.
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