Overview
Cyclohexanone is a cyclic ketone primarily produced via the oxidation of cyclohexane or phenol. Premium-grade (优级品) cyclohexanone exceeds 99.5% purity, making it critical for high-end industrial applications. As a versatile intermediate, it plays a central role in caprolactam production for nylon-6, accounting for over 70% of global consumption. The chemical's excellent solvency and moderate evaporation rate also make it valuable in coatings, adhesives, and ink formulations. Manufacturers prioritize low moisture content (<0.1%) and controlled aldehyde/acid concentrations in premium grades to ensure optimal reaction yields.
Physical and Chemical Properties
Cyclohexanone's six-carbon ring structure with a carbonyl group gives it unique solvent properties, dissolving cellulose derivatives, natural resins, and synthetic polymers. Its moderate polarity (dielectric constant ~18) allows compatibility with both polar and non-polar compounds. The ketone exhibits typical carbonyl reactivity, undergoing condensation, hydrogenation, and oxidation reactions. Key quality indicators for premium grades include APHA color (<15), peroxide value (<0.1 mmol/kg), and acid value (<0.01 mg KOH/g). Distillation range (155-156°C at 760 mmHg) and refractive index (1.450-1.451 at 20°C) serve as quick purity checks.
Main Applications
In nylon manufacturing, cyclohexanone is converted to cyclohexanone oxime then caprolactam through Beckmann rearrangement. This single application consumes about 4 million metric tons annually worldwide. The chemical's balanced evaporation rate makes it ideal for slow-drying lacquers, especially for automotive and wood coatings where blush resistance is critical. Pharmaceutical applications include synthesis of hormone analogs and vitamin B6. Emerging uses include lithium-ion battery electrolytes and specialty polymer plasticizers, where ultra-high purity grades (99.9%) are essential for performance stability.
Safety and Storage
As a Category 3 flammable liquid (flash point 44°C), cyclohexanone requires storage in grounded containers away from oxidizers. Steel or polyethylene containers are preferred; aluminum may react with trace acids. Vapor concentrations above 1.1% in air form explosive mixtures, necessitating explosion-proof equipment in handling areas. Workplace exposure should be maintained below 25 ppm (8-hour TWA) per OSHA guidelines. Spills should be contained with inert absorbents, never washed into drains due to aquatic toxicity (LC50 fish: 5-50 mg/L). Firefighting requires alcohol-resistant foam; water may spread flames.
B2B Procurement Guide
Premium-grade procurement should specify: purity (≥99.5%), water content (≤0.1%), APHA color, and acid value. Drum (200kg) and isotank shipments are common, with nitrogen blanket recommended for bulk storage. Reputable suppliers provide batch-specific GC analysis and stability data. Consider regional logistics: coastal plants often offer better pricing for containerized shipments, while inland suppliers may excel in just-in-time deliveries. Audit suppliers for distillation capabilities - fractional distillation with reflux ratios >5:1 ensures consistent quality. Contracts should include rejection clauses for off-spec material.
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