Overview
o-Xylene solution is a versatile industrial solvent consisting of o-xylene (1,2-dimethylbenzene) dissolved in a carrier liquid, typically another organic solvent or water-emulsified form. It is widely used in chemical manufacturing due to its effective solvency for resins, polymers, and oils. As a derivative of xylene, it shares properties with its isomers (m-xylene and p-xylene) but offers distinct reactivity in chemical synthesis, particularly in phthalic anhydride production. Commercial solutions vary in concentration, often ranging from 30% to 100% pure o-xylene.
Physical and Chemical Properties
o-Xylene is a colorless liquid with a characteristic aromatic odor. Its solution form retains the low viscosity and high volatility of the pure compound, with physical properties adjusted by the carrier solvent. The substance is hydrophobic, evaporating quickly at room temperature, and forms explosive vapor-air mixtures at concentrations above 1%. Chemically, o-xylene undergoes reactions typical of alkylbenzenes, including oxidation to phthalic derivatives and sulfonation. Its solution stability depends on the carrier; hydrocarbon-based solvents enhance shelf life, while polar carriers may require stabilizers.
Main Applications
The primary use of o-xylene solution is as a solvent in paint, varnish, and adhesive formulations, where it dissolves alkyd resins and synthetic rubbers effectively. It also serves as a thinner for printing inks and coating systems in the packaging industry. In chemical synthesis, it is a feedstock for phthalic anhydride, dyes, and plasticizers. Lesser-known applications include its role as a cleaning agent for electronics manufacturing and a carrier for pesticide formulations in agriculture.
Safety and Storage
o-Xylene solutions are flammable liquids classified under GHS Category 2. Storage requires OSHA-compliant containers (e.g., metal drums or UL-approved plastics) in well-ventilated areas with explosion-proof fittings. Secondary containment is recommended to prevent groundwater contamination. Exposure risks include respiratory irritation and central nervous system depression. NIOSH recommends a permissible exposure limit (PEL) of 100 ppm (8-hour TWA). Spill response should use non-sparking tools and chemical absorbents, never water jets.
B2B Procurement Guide
Industrial buyers should specify required purity (industrial grade ≥98% is common), concentration, and carrier solvent compatibility. Bulk purchases (ISO tank containers or 200L drums) typically offer 10–15% cost savings over small packaging. Key suppliers include PetroChina, ExxonMobil Chemical, and regional distributors. Certifications to request: REACH compliance, SDS with transportation classifications, and batch-specific COA (Certificate of Analysis). For global shipments, verify if the solution falls under UN 1307 (Xylenes) for proper DG labeling.
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